Questions Asked on
March 28, 2010

  1. Chemistry

    The equation below shows the incomplete combustion of ethene. C2H4(g) + 2O2(g) ==> 2CO(g) + 2H2O(g) If 2.70 mol C2H4 is reacted with 6.30 mol O2, a) identify the limiting reagent. b) calculate the moles of water produced. Show all steps.

    asked by Keith
  2. Chemistry

    If 50.0 g of silicon dioxide is heated with an excess of carbon, 27.9g of silicon carbide is produced. SiO2(s) + 3C(s) --> SiC(s) + 2CO(g) what is the percent yield of this reaction?

    asked by Kim
  3. physics

    A ball of mass 0.075 kg is fired horizontally into a ballistic pendulum. The pendulum mass is 0.350 kg. The ball is caught in the pendulum, and the centerof mass of the system rises a vertical distance of 0.145 m in the earth's gravitational field. What

    asked by sara
  4. chemistry

    In clinical lab reports, some concentrations are given in mg/dL. Convert a Ca2+ concentration of 3.5 mg/dL to weight/volume percent.

    asked by Jen
  5. chem

    classify each of the following as a lewis acid or base: Cl- BeCl2 B(CH3)3 P(Ch3)3 Cl- is an acid right? i'm not sure i understand this concept very well. :[ and i tried looking at my notes already.

    asked by Katie
  6. math(advanced algebra&trigonometry)

    If θ is an angle in standard position and its terminal side passes through the point (−3,2), find the exact value of cscθ . I know the answer...but i want to know how you get the answer... The answer is radical 13/2

    asked by Rony
  7. Pre-Calculus

    A piece of plexiglass is in the shape of a semi-circle with radius 2m. Determine the dimensions of the rectangle with the greatest area that can be cut from the piece of plexiglass?

    asked by Erin
  8. Chemistry

    Gallium65, a radioactive isotope of gallium, decays by first order-kinetics. The half-life of this isotope is 15.2 min. How long would it take for 7/8 of a sample of this isotope to decay? 15.2 min 30.4 min 45.6 min 48.0 min I'm not sure how to do this. I

    asked by Val
  9. Chemistry

    When 84.8 g of iron(III) oxide reacts with an excess of carbon monoxide, iron is produced. Fe2O3(s) + 3CO(g) ==> 2Fe(s) + 3CO2(g) what is the theoretical yield of iron?

    asked by Kim
  10. general science

    A compound containing 3 atom of carbon and 8 atoms of hydrogen is combined in a reaction wih oxygen molecules. The two end products of this equation are carbon dioxide (CO2)and water. What element should you look at first in balancing this equation?

    asked by jessica
  11. College Chem

    If equal masses of O2 and N2 are placed in identical containers at the same temperature, which of the following statements is (are) true? a. both flasks contain the same number of molefules b. the pressure in the N2 flask is greater than in the other

    asked by Donna
  12. chemistry

    The maximum concentration set by the U.S. Environmental Protection Agency for lead in drinking water is 15 ppb. What is this concentration in milligrams per liter? How many liters of water contaminated at this maximum level must you drink to consume 1.0 ug

    asked by Hannah
  13. chemistry

    Calculate the molar heat of neutralization in kJ/mol of the reaction between HA and BOH given the following information: The temperature change equals 7C, 50 mL of 1 M concentration of Acid 50 mL of 1 M concentration of Base Heat capacity of the

    asked by Aaron
  14. Physics

    Thank you for any help and assistance. Here is the question/problem: Because of the pressure inside a popcorn kernel, water does not vaporize at 100 degrees Celsius. Instead, it stays liquid until its temperature is about 175 degrees Celsius, at which

    asked by Demi
  15. Chemistry

    4. Write the balanced equation for CH4+Cl2„_CH2Cl2+HCl. 5. Using the equation in problem 4 if 6.00 g of CH4 are mixed with 6.00 g of CL2, how much HCl can be made? What is the percent yield if 2.5 g are recovered from the reaction in the lab?

    asked by Kathleen
  16. sci...

    what is trace fossil

    asked by pavleen
  17. physics

    A ball is dropped from a height of 20m and rebounds with a velocity which is 3/4 of the velocity with which it hit the ground. What is the time interval between the first and second bounces?

    asked by Edwin
  18. Chemistry

    If the same volume (130-mL) of the buffer were 0.265 M in NH3 and 0.400 M in NH4Br, what mass of HCl could be handled before the pH fell below 9.00? I used the henderson-hasselbalch equation to solve this. i set it up as

    asked by Kyle
  19. chem

    What volume of 0.200 M Fe(NO3)3 is needed to make 50ml of o.oo200M Fe(NO3)3?

    asked by amber
  20. physics

    A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre

    asked by Edwin
  21. Physics

    Two very long, straight, parallel wires separated by distance d carry currents of magnitude I in opposite directions. Find the magnetic field at a point equidistant from the lines, with a distance 2d from each line.

    asked by Lee
  22. Chemistry

    Given the elementary reaction: 2 NOBr==>2 NO + Br2 k = 0.80 Which variables obtained for this reaction will produce a straight line? log[NOBr] vs. t [NOBr] vs. t [NOBr]2 vs. t 1/[NOBr] vs. t instinctively i would choose B, but I am not sure what my prof is

    asked by Val
  23. Physics

    How man joules are required to increase the temperature of 1 kg of granite by 1000K using 790 joule/kilogram-kelvin as the specific heat of granite.

    asked by John
  24. Math

    what are the steps on how to balance Al + O2 -----> Al2O3

    asked by Anna
  25. chemistry

    1.) What must be the molarity of an aqueous solution of trimethylamine (CH3)3N if it has a Ph of 11.04? Kb = 6.3*10^-5 if someone can show the mechanics of doing this, will be appreciated much.

    asked by anonymous
  26. chemistry

    A particular household ammonia solution (d = 0.97 g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.50?

    asked by anonymous
  27. math

    What is the major axis and the domain of the equation 9x^2 + 16y^2 - 36x + 96y + 36 = 0 ?

    asked by dcw
  28. physics

    a projectile is fired in the earth's gravitational field with a horizontal velocity of v=9.00 m/s. How far does it go in the horizontal direction in 0.550 seconds?

    asked by sam
  29. Biology

    In many tissues, one of the earliest responses to cellular injury is the rapid increase in the levels of the enzymes involved in the pentose phosphate pathway. Ten days after an injury, heart tissue has levels of glucose-6-phosphate dehydrogenase and

    asked by Anonymous
  30. Henderson-Hasselbalch

    If the same volume (130-mL) of the buffer were 0.265 M in NH3 and 0.400 M in NH4Br, what mass of HCl could be handled before the pH fell below 9.00? I used the henderson-hasselbalch equation to solve this. i set it up as

    asked by Kyle
  31. physics

    A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control line is attached to a fixed point. When the aeroplane flies with its wings horizontal in a horizontal circle, making one

    asked by Edwin
  32. algebra

    2 pairs of shoes, 5 pairs of pants, and 6 shirts on a trip. Assuming all items are compatible, how many different outfits can be worn?

    asked by john
  33. Pre-Calc (exponential growth)

    A COLONY OF BACTERIA IS GROWN UNDER IDEAL CONDITIONS IN A LAB SO THAT THE POPULATION INCREASES EXPONENTIALLY WITH TIME. At the end of the three hours, there are 10,000 bacteria. At the end of the 5 hours, there are 40,000 bacteria. How many bacteria were

    asked by Phillip
  34. physics

    Physics force of friction question a shuffle board disk is accelerated to a speed of 5.8m/s and released. if the coefficient of the kinetic friction between the disk and the concrete court is 0.3, how far does the disk go before it comes to a stop?The

    asked by jake
  35. Science, Physics

    The Pith balls may be positive, negative or neutral. Four pith balls are suspended by insulated threads. The following reaction occurs. a) #2 pith ball is positively charged b) #2 attracts all the other pith balls,. c) #1 and#3 pith balls repel each other.

    asked by Sagal
  36. Chem

    Aspirin (acetylsalicylic acid, ) is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolved 2.00 g of aspirin in 0.600 L of water and measured the pH . What was the Ka value calculated by the student if the of the pH of the

    asked by Katie
  37. physics

    A ball of mass 0.075 kg is fired horizontally into a ballistic pendulum. The pendulum mass is 0.350 kg. The ball is caught in the pendulum, and the centerof mass of the system rises a vertical distance of 0.145 m in the earth's gravitational field. What

    asked by april
  38. american literature

    choose an epigram in the excerpt from Emerson's Nature? or where can i find information on it

    asked by Anonymous
  39. College Chem

    The boiling point of water at 756 mm Hg is 99.85 degree C. What mass percent of surcrose (C12H22O11) should be present to raise the boiling point to 100.00 degree C at this pressure?

    asked by Donna
  40. PreCalc

    [b]1. The problem statement, all variables and given/known data[/b] The average growth rate of the population of a certain city is 7.5% per year. The city's population is now 22,750 people. What is the expected population in 10 years? [b]2. Relevant

    asked by Kate
  41. Chemistry

    .12M Lactic Acid (HC3H5O3, Ka=1.4x10^-4) is mixed with .10M NaC3H5O3 to form 1.00L solution. A. Calculate the pH of the solution after the addition of 50.0mL of 1.00M NaOH. B. Calculate the pH of the solution after the addition of 120.0mL of 1.00M NaOH.

    asked by Emma
  42. sci

    wat is the difference betwwen a mold and cast

    asked by pavleen
  43. chemistry

    Suppose you wanted to produce an aqueous solution of = 8.65 by dissolving the following salt KNO2. At what molarity would you use?

    asked by sab
  44. Physical Science

    11. Chromium is produced by reacting its oxide with aluminum. If 76g of Cr2O3 and 27g of Al completely react to form 51g of Al2O3, how many grams of Cr are formed?

    asked by Zak
  45. Biostatistics

    Age(10-14)(15-19)(20-29)(30-39) (40-44) Mid 12.5 17.5 25 35 42.5 P(X=x) .003 .100 .500 .300 .097 If we select a birth at random, what is the probability the mother is 19 years or younger?

    asked by Louise
  46. physics

    (a) What is the tangential acceleration of a bug on the rim of a 6.0 in. diameter disk if the disk moves from rest to an angular speed of 79 rev/min in 5.0 s? (b) When the disk is at its final speed, what is the tangential velocity of the bug? (c) One

    asked by Kelsey
  47. math- CAN SOMEONE PLEASE CHECK MY WORK

    In 1992, the life expectancy of males in a certain country was 73.5 years. In 1996, it was 75.7 years. Let E representthe life expectancy in yeart and let t represent number of years since 1992. Fill in the linear function E(t) that fits the data

    asked by KiKi
  48. SCIENCE: GR.10 OPTICS CONVEX MIRRORS

    A convex security mirror has a focal length of -0.25m. A person with a height of 1.5m is 4m from the mirror. calculate the image distance and image height. AND An object 0.4m tall is placed 2.5m in front of a convex mirror that has a focal length of -90cm.

    asked by lily
  49. chemistry

    write a balanced chem equation for solid lead (II) sulfide reacts with aq hydrochloric acid to form solid lead (II) chloride and dihydrogen sulfide gas.

    asked by jen
  50. math

    wich is not a prime number 11 21 31 41

    asked by ikd
  51. Precalculus(NEED HELP ASAP PLEASE!!)

    cot(theta)= 3 pi < theta < 3pi/2 Find: sin(theta)= -1 ? cos(theta)= -3 ? tan(theta)= 1/3 ? sec(theta)= -1/3 ? csc(theta)= -1 ? That's what I came up with, but they are not correct, PLEASE help me where I went wrong!!

    asked by jh
  52. CHM

    Given the initial concentrations of 0.10 atm NO2 and 0.10 atm N2O4 in a 1.0 L flask, what will be the equilibrium partial pressure of NO2? N2O4(g)=2NO2 Kp=0.660at319K Choose one answer. a. 0.10 atm b. 0.31 atm c. 0.045 atm d. 0.72 atm e. 0.19 atm

    asked by AMI
  53. chemistry

    Hydrogen and oxygen react according to the equation: 2H2 + O2 -> 2H2O. According to Avogadro's law, how many liters of hydrogen are required to react with 2.0 L of oxygen at STP? How do you set this equation up and find the answer???

    asked by Jen
  54. math

    The mean score on a Math exam was 50% and the standard deviation was 10%. Assume the results were normally distributed. (a) What percent of students earned a score between 50% and 70%? (b) If 60 students took the exam, how many got a score between 50% and

    asked by kevin
  55. Probability

    Could you please explain how to do this question. Suppose that a certain candidate is running in a city election. A recent poll of 500 randomly chosen voters concludes that 60% of the voters prefer this candidate. Determine the probability that the

    asked by Sandy
  56. Chemistry

    IN the polystyrene beaker, mix 20mL of 0.1 M Acetic acid and 25mL of 0.1M Sodium Acetate and immediately measure the pH. Remove the electrode and add 5ml of 0.1 M HCl to this buffer. Stir the solution and measure the pH. _______________ INFO: concentration

    asked by Saira
  57. business

    Discuss the general environmental challenges of international management that a manager faces in the global environment that she would not face in a domestic one?

    asked by Anonymous
  58. physics

    a fluid flows through a horizontal pipe of varying cross-section. Assuming the flow is streamline and applying the bernoulli equation, show that pressure in the pipe is greatest where cross-sectional area is greatest.

    asked by Edwin
  59. another word problem!

    iN 1993, THE LIFE EXPECTANCY of males was 68.6 years. In 2000, it was 71.1 years. Let E represent the life expectancy in year t and t represent the number of years since 1993. The linear function E(t) that fits this data is: E(t)=_t + _ (round to the

    asked by bob
  60. Calculus

    Find constants a,b, and c such that the function f(x)=ax^3+bx^2+c will have a local extremum at (2,11)and a point of inflection at (1,5). Sketch the graph of y=f(x). How would I solve this. Thank you.

    asked by Wayne
  61. chemistry

    Choose all of the following statements about the equilibrium constant K that are true: (a) If the K value for a reaction is > 1 then Go must be negative for this reaction (b) A large value for K implies there is a strong driver for the reaction to proceed

    asked by James
  62. trig

    solve the equation 2sin^2X - 3sinX= -1

    asked by sol
  63. MATH

    A model train is a scale model created from actual measurements. The scale factor for HO or Half Zero model trains is 1:87. A typical engine is 50mm in height and 200mm in length. Determine the actual dimensions of the train engine. Help Please

    asked by Anonymous
  64. Precalculus(NEED HELP ASAP PLEASE!!)

    PLEASE HELP!! csc(theta)= -3/2 3pi/2 < theta < 2pi Find: sin(theta)= _____ ? cos(theta)= _____ ? tan(theta)= _____ ? cot(theta)= _____ ? sec(theta)= _____ ?

    asked by jh
  65. physics

    If the amplitudes of the two waves are 3 units and 1 unit respectively, show by the principle of superposition that the ratio of the amplitudes of the stationary wave at an antinode and node respectively 2:1

    asked by Edwin
  66. physics

    a fluid flows through a horizontal pipe of varying cross-section. Assuming the flow is streamline and applying the bernoulli equation, show that pressure in the pipe is greatest where cross-sectional area is greatest.

    asked by Edwin
  67. math-word problem- PLEASE CHECK MY ANSWER

    Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and train B is traveling at 120 miles per hour. Train A passes a station at 5:20am. If train B passes the same station at 5:35 am, at what time

    asked by KiKi
  68. Math (Accounting)

    Reading Foods is interested in calculating its weighted average cost of capital (WACC). The company’s CFO has collected the following information: • The target capital structure consists of 40 percent debt and 60 percent common stock. • The company

    asked by Michael
  69. College Chemistry

    The boiling point of a liquid at atmospheric pressure is the temperature: a. at which bubbles of vapor expand within the liqud b. at which the liquid solidifies c. at which the vapor pressure first exceeds the critical temperature d. at which the vapor

    asked by Donna
  70. chemistry

    A solution is prepared by dissolving 0.2222 (¡¾0.0002) g of KIO3 in 50.00 (¡¾0.05) mL. (i) Calculate the molar mass of KIO3 with its associated uncertainty to the correct number of significant figures. (ii) Find the molarity and its uncertainty with an

    asked by Hobson
  71. English

    We use 'Yours sincerely' or 'Sincerely urs.' at the end of a letter. Then what is the full form of 'Yours sincerely'? 1. I am your sincerely friend. 2. I am your sincerely servant. 3. I am your sincerely friend/servant. 4. I am your friend/servant

    asked by rfvv
  72. chemistry

    The pH of saturated Sr(OH)2 (aq) is found to be 13.12. A 10.0 mL sample of saturated Sr(OH)2 (aq) is diluted to 250.0 mL in a volumetric flask. A 10.0 mL sample of the diluted Sr(OH)2 (aq) is transferred to a beaker, and some water is added. The resulting

    asked by anonymous
  73. MATH

    A model train is a scale model created from actual measurements. The scale factor for HO or Half Zero model trains is 1:87. A typical engine is 50mm in height and 200mm in length. Determine the actual dimensions of the train engine. Help Please

    asked by Anonymous
  74. calc

    how do i find the derivative of........ (sinx) ^2-(cosx) ^2 i put it into my t-89 and got -4sinxcosx butthats not a multiple choice. can someone tel me how to do this by hand?

    asked by James
  75. math-please help due tonight

    find the two ordered pairs from this equation. y+x=-2 then give the ordered pair of the y intercept?

    asked by KiKi
  76. calc

    Find the critical numbers of the function. f(x) = x^-2ln(x)

    asked by Morgan
  77. Physic

    A particular comet has an elliptical orbit. When closest to the Sun (perihelion) it is at a distance of 8.823 1010 m and moves with a speed of 54.6 km/s. The greatest distance between this comet and the Sun (aphelion) is 6.067 1012 m. a. Calculate its

    asked by Mary
  78. chemistry

    While researching energy values of fuels, a chemist designed an experiment to find out the heat of combustion of pentane. Using the known hexane heat of combustion of hexane = 4650kJ/mol and the data below calculate the heat of combustion of pentane. Set

    asked by sarah
  79. chemistry

    While researching energy values of fuels, a chemist designed an experiment to find out the heat of combustion of pentane. Using the known hexane heat of combustion of hexane = 4650kJ/mol and the data below calculate the heat of combustion of pentane. Set

    asked by sarah
  80. English

    With your partner, talk about what is seen in the picture taking turns. Sentence A is an example sentence. Like Sentence A, make sentences looking at the picture. I see a cat is playing with a ball on her right hand. I see a lady who is watching TV lying

    asked by rfvv
  81. Accounting PLEASE HELP!!!!!!!!!

    Reading Foods is interested in calculating its weighted average cost of capital (WACC). The company’s CFO has collected the following information: • The target capital structure consists of 40 percent debt and 60 percent common stock. • The company

    asked by Michael
  82. chem

    when doing a paper chromatography lab, my class used a solvent with a neutral pH, which my teacher said would help separate the amino acids with simialar Rf values. can anyone please explain why we needed to use a solvent with a neutral pH?

    asked by chrissy
  83. ALGEBRA

    Find the coordinates of the midpoint for the following equation: y = -2x^2 + 20x + 1. Your answer should be in the form (x-coordinate, y-coordinate). (Hint: Find the x-coordinate by using the Midpoint Formula [-b / (2a)]. Then find the y-coordinate by

    asked by GGIFT
  84. chemistry I

    using this equation: CH4+2Cl2-> CH2Cl2+2HCl. If 6.00g of Ch4 are mixed with 6.00g of Cl2, how much HCl can be made?

    asked by jill
  85. social studies

    Woodrow Wilson faced a number of obstacles in making his Fourteen Points a reality including several of his own making and some that were beyond his control. Discuss the nature of these obstacles and why Wilson failed to achieve his goals? Please help!

    asked by Dellaine
  86. math-word problem

    Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and train B is traveling at 120 miles per hour. Train A passes a station at 5:20am. If train B passes the same station at 5:35 am, at what time

    asked by KiKi
  87. AP Chem.

    NaCl dissociates completely in water. Therefor the total number of particles in a 1.0 m NaCl solution is no longer 6.02 X 10^23. Since a colligative property is dependent only on the total number of solute particles, what is the freezing point for 1.0 m

    asked by Heather
  88. Astronomy

    Retrograde motion describe the A backward motion of the stars relative to Earth B uniform circular motion exhibited by the planets C irregular speeds at which the planet travel. D backward motion of the planets with respect to the stars I think the answer

    asked by B
  89. Science

    I have to create a slide show of 7-10 slides about urbanization, yet I am confuse on where to start. I also have to discuss the main points of urbanization, and challenges of urbanization. How do i start? I been looking up some few examples but still don't

    asked by Nary
  90. math-slope

    f(x)=-2x-3 Find the slope and the y intercept

    asked by KiKi
  91. maths

    how many turns must a bicycle wheel of a radius 0.5 m make to travel a distance of 100 m

    asked by annika frost
  92. maths

    a pizza is 22 cm and a third of it is covered in cheese what area is that that has been covered in cheese

    asked by annika frost
  93. social studies

    discuss how world war I affected the lives of americans. how did it change american social realities regarding women the family and society in general? Can someone help me on this?

    asked by Dellaine
  94. Financial Management

    Reading Foods is interested in calculating its weighted average cost of capital (WACC). The company’s CFO has collected the following information: • The target capital structure consists of 40 percent debt and 60 percent common stock. • The company

    asked by Michael
  95. Astronomy

    Scientists can determine what distant stars are made of, as well as their temperatures and velocities, by looking at A absorption B emission spectra C continuous spectra D samples obtained from them E we cannot determine these things about distant stars I

    asked by Anonymous
  96. College Chem

    If equal masses of O2 and N2 are placed in identical containers at the same temperature, which of the following statements is (are) true?

    asked by Donna
  97. English

    Can you please check the following questions as I need to prepare them for tomorrow. Thank you very much in advance. 1) Examine the main features of Queen Victoria's reign and its contributions to the shaping of modern Great Britain. 2) Explain how

    asked by Franco
  98. finance

    A machine cost $ 4,000. It lasts 2 years and has no scrap value (that is, it has no value at the end of those two years of use). In each year, it produces $ 2400 in income. Should the firm invest in the machine if the interest rate is 10%? Should the firm

    asked by Claire
  99. Chemistry

    What is C2H5OH?

    asked by Christopher
  100. science (energy) really needs help!!!

    What is chemical potential energy?? :) please help!!!!!!!!!!!!!!!!!!!!!!!!

    asked by PoppY!!!!!!!!!!!!!!!!!!!!
  101. algebra

    How do i find the transformed equation of the hyperbola xy = 4 when rotated 45 degrees? I don't understand at all. my choices are: A - (x')²(y')² = 4 B - (x')² - (y')² = 4 C - (x')² - (y')² = 8

    asked by dcw
  102. Geology 101

    Why are nights in arid lands surprisingly cold?

    asked by Brandi
  103. math

    24x-10=18x-4

    asked by maeve
  104. Pre-Cal

    Find the magnitude and direction angle of the vector v. v= 8(cos135 degrees i + sin135 degrees J) I think that the answer is v= 5 and Q = 135. Am I correct?

    asked by Hannah
  105. college

    Two parallel plates, each with zero mass and an area of 10,000 cm2 are set 0.1 mm apart and the space between them is filled with a Newtonian fluid. The upper plate is pushed in the direction shown with a constant force sufficient to accelerate a mass of 1

    asked by BB
  106. sci

    how does a mold fossil form

    asked by pavleen
  107. Science

    What is time dilation refers: to increasing time factors as one's speed increases I can not find any information on this

    asked by Anonymous
  108. science optics

    A cosmetic mirror is 50cm from your face and the magnified image of your face is upright. You are told that the focal length of the mirror is 45cm. Explain why this focal length is not possible. I understand that the image would be magnified and

    asked by lily
  109. environmental science

    Starting with a hypothetical population of 14,000 people and an even age distribution (1,000 in each age group from 1-5 to 66-70 years), assume that the population initially has a total fertility rate of 2.0 and an average life span of 70 years. Using the

    asked by sarah
  110. chemistry

    Which of the following values corresponds to the equilibrium constant K for the dissociation of acetic acid? The standard free energy of formation, G0f of CH3COOH (aq) is -396.46 kJ mol-1 and that of CH3COO- (aq) is ¡V 369.31 kJ mol-1. (a) 1.75 x 10-5 (b)

    asked by Bell90
  111. English

    1.Choose a movie or a performance you saw recently and write down your story in the blanks. I like watching movies. I saw Titanic. I think it was fantastic. 2. Based on the summarized above, write down your movie report /write down your impression about

    asked by rfvv
  112. chemistry

    1gm of AgNO3 is dissolved in 50ml of h2o. it is titrated with 50ml od sol. agi is precipitated is filtered of.the exces of ki is then titrated with 1/10M KIO3 in the presence of acidic medium until all I->>ICl. it reqires 50ml of the 1/10M KIO3 sol. 20ml

    asked by debby
  113. English

    1. He died young. 2. He died when he was young. 3. When he was young, he died. (Are they all the same?) 4. a strong wind, a high wind, a heavy wind, 5. a weak wind, a low wind a light wind, a gentle wind 6. a warm wind, a chill wind, a chilly wind, a

    asked by rfvv
  114. literary

    what is the subordinating conjunction in this sentence..? I mentally outlined my essay while i waited for the bus.

    asked by k
  115. 7th grade Science

    Determine your distance traveled if you walk 100m forward and then 35m backward

    asked by Mary
  116. maths

    find x, tanxsinx= 3sinx-secx

    asked by michael
  117. chemistry

    A 1.00 L volume of 0.609 M HNO3 is condensed to a volume of 0.750 L, calculate the molarity (M) of H+ in the new solution

    asked by eng
  118. math

    when sixty five and fourteen hundredths is subtracted from eighty and forty eight hundreths what is the difference

    asked by ikd
  119. classroom instruction

    • Plan a science experiment. In your paper, address the following points: o List the equipment and materials to be included in the science kit. o Explain what safety precautions are needed. o Outline the step-by-step procedures for the experiment. o

    asked by scooby
  120. Chemistry

    Calculate the enthalpy change for the following equation: NO(g)+ 1/2O2(g) -----> NO2(g) I have no clue how to do this. I just know the answer is supposed to be approximately -57.2 kJ. Can some explain to me what to do?

    asked by Ana
  121. social studies

    Discuss how World War I affected the lives of Americans. How did it change American social realities regarding women the family and society in general? Please help I've looked and just cant come up with nothing.

    asked by Dellaine
  122. Human relations

    what types of communication filters are present A female doctor attempting to explain to her 27-year-old male patient that his severe acne can be cured with a specific drug, but the side effect of the drug might be that he will be temporarily bald. Filters

    asked by Ravioli
  123. psychology

    So you answered my question to tell me not to post it twice that was an accident...heres my question i need some help please, don't tell me to post again because it was by accident. Which color arrangement wouldcreate the deepest senseof space? A.

    asked by jake
  124. Assignment Help

    There are 1000 students in the University of A. A sample of 10 observations was obtained regarding the rating of the service quality of dining hall. Here is the sample: Observation Rating 1 5 2 6 3 7 4 3 5 8 6 5 7 6 8 3 9 4 10 7 calculate the confidence

    asked by JL
  125. algebra/common math

    how do I solve this? I know it's common math, but I cannot remember how! -4x> 1/11 I think I multiply both sides by 11, but..... I can't remember how!

    asked by bob
  126. physics

    Physics force of friction question a 63kg water skier is pulled across a lake by a rope that exerts a force of 3.2x10^2 and makes an angle 17 degrees above the horizontal. if the coefficient between the skies and the lake is 0.27 at what rate will the

    asked by jake
  127. math

    x+2y=4 Find the ordered pairs would this be (0,2) and (4,0)?

    asked by KiKi
  128. math-graphing

    y>-5 x>6 How would I get ordered pairs to graph this?

    asked by KiKi
  129. science

    Which pairs of substances will form a buffer when mixed in equal concentrations?

    asked by krissy
  130. math-word problem-please help

    Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and train B is traveling at 120 miles per hour. Train A passes a station at 5:20am. If train B passes the same station at 5:35 am, at what time

    asked by KiKi
  131. chemistry

    How much water is added to 5.28 grams of ethanol to get a concentration of 1.67M?

    asked by price
  132. math- system

    x+5y=4 x=7-5y give the ordered pair

    asked by KiKi
  133. chem

    calculate delta H for N2O+4H2>N2+4H2O

    asked by john
  134. sci

    what is mold fosil

    asked by pavleen
  135. social studies

    woodrow wilson faced a number of obstacles in making his Fourteen Points a reality including several of his own making and some that were beyond his control. Discuss the nature of these obstacles and why wilson failed to achieve his goals? PLease Help!!!!

    asked by Dellaine
  136. math

    Find the two ordered pairs using this equation- x+3y=6

    asked by KiKi
  137. Math- CAN SOMEONE PLEASE CHECK MY WORK?

    7x+5y=-26 x=28-6y solve using substitution okay so then 196-42y+5y=-26 then combined like terms so 196+37y=-26 37y=-222 y=-6 is this part correct?

    asked by KiKi
  138. Astronomy

    The speed of light is the same for all observers, and the laws of physics are the same for all observers in uniform motion. These two statements are fundamental postulates of A) general relativity B) Newtons laws of motion C) special relativity D) the laws

    asked by Anonymous
  139. math

    The difference between the ages of two friends is 2 years. The sum of their ages is 74 years. Find the age of the older friend.

    asked by Anonymous
  140. help plz?

    Which word is an antonym of vociferous? a}soft-spoken b}clamorous c}blatant d}obstreperoys

    asked by lidsey
  141. college Chemistry

    An aqueous solution of hydrogen peroxide, H202 (MW=34.01amu), is labeled 10.0% by weight. What is the molal concentration of H202? All I really know is that molality = moles of solute per kilogram of solution

    asked by Donna
  142. Maths

    Alright I'm doing a maths review (grade 11) and on the page, the subtitle says "Quadratics" and then underneath is the questions, no instructions. I figured out the first one "y^2+2y+1" and got to "(y+1)^2", but the second question is "49-(2y-w)^2". I

    asked by Felicity
  143. College Chemistry

    A 0.05 molal aqueous solution boils at 373.102 K. What is the salt in question? a. AlCl3 b. NaHSO3 c. MgCl2 d. NH4Cl e. NaCl I guessed NH4Cl and got 3 points off. I used the formula delta T=K boiling point X molality

    asked by Donna
  144. chemistry

    The standard free energy of formation of the aqueous complex ion Cd(NH3)42+ is -226.1 kJ mol-1. The free energy of formation of NH3 is -26.50 kJ mol-1 and that of the Cd2+ ion is -77.61 kJ mol-1. The value of the stability constant for the complex ion

    asked by Bell90
  145. Physic

    Two softballs, each with a mass of 0.125 kg, are separated by a distance of 820 m in outer space. a. If the balls are released from rest, what speed do they have when their separation has decreased to 680 m? Ignore the gravitational effects from any other

    asked by Victoria
  146. chemistry

    The concentration is 1.67M. I have 5.28 grams of ethanol. How many liters of water will I need to make this solution with the above concentration?

    asked by linda
  147. trigonometry

    solve for 2cos2x=tan225 and, solve using transformation method cosx+ root2sinx= root3 THANKS!

    asked by TRACY
  148. math

    when sixty five and fourteen hundredths is subtracted from eighty and forty eight hundreths what is the difference

    asked by ikd
  149. statistics

    A column packing for chromatography consists of a mixture of two types of particles. Assume that the particles in the batch being sampled are spherical with a radius of 0.5 mm. 36% of the particles appeared to be pink and are known to have a polymeric

    asked by Simon
  150. science (energy)

    What is chemical potential energy?? :)

    asked by poppy
  151. chemistry

    2.) A particular vinegar is found to contain 5.9% acetic acid by mass. What mass of this vinegar should be diluted with water to produce 0.750 L of a solution with pH = 4.58?

    asked by anonymous
  152. environmental science for college

    Starting with a hypothetical population of 14,000 people and an even age distribution (1,000 in each age group from 1-5 to 66-70 years), assume that the population initially has a total fertility rate of 2.0 and an average life span of 70 years. Using the

    asked by sarah
  153. math

    The two triangles are similar. Find g., just need to finish the formula, I have this so far g/15 = 15.65/10.5 g=

    asked by Bstone
  154. ALGEBRA

    How do you know if a quadratic equation will have one, two, or no solutions? How do you find a quadratic equation if you are only given the solution? Is it possible to have different quadratic equations with the same solution?

    asked by GGIFT
  155. ALGEBRA

    Quadratic equations can be solved by graphing, using the quadratic formula, completing the square, and factoring. What are the pros and cons of each of these methods? When might each method be most appropriate? Which method do you prefer?

    asked by GGIFT
  156. math

    Earth exerts a force on an object equal to the objects weight. the object exerts a force on earth I think the answer is it equal zero?

    asked by Anonymous
  157. algebra

    I need help finding the center and latus rectum of the equation: 3y^2 - 2y + x + 1 = 0

    asked by dcw
  158. English

    1. Push the gate shut. 2. Pull the gate open. 3. He slammed the door open/closed. (Are they all grammatical? What is the part of speech of 'shut,' 'open' or 'closed'? Are they adjectives or verbs? )

    asked by rfvv
  159. English

    1. I like action programs. 2. I like action movies. 3. I like action movie programs. 4. I like action movie TV programs. 5. I like watching action movies. 6. I like watching action movies on TV. 7. I like watching action TV programs. 8. I like action movie

    asked by rfvv
  160. math-word problem

    Amy paid $53.74 for a pair of running shoesduring a 15% off sale. what was the regular price?

    asked by KiKi
  161. accounting

    How is the receipt of a dividend recorded under the equity method?

    asked by Karla
  162. calculus

    Determine all the absolute extreme values for the function f(x,y) = sin(x)*sin(y)*sin(x+y)on the square 0

    asked by LOL
  163. Physics

    You meet a person with prescription glasses of +0.55 dpt. What is the near point of this person? Express the result as a positive number! Hint: the near point of a healthy person is 25 cm. An object placed at this distance will form an image at the near

    asked by Sandra
  164. GEOMETRY

    Decide which of the variables described is likely to have a normal or near-normal distribution. a. The number of courses remaining until graduation for the students in a small liberal arts college b. The SAT mathematics scores for students in an advanced

    asked by ISOFI
  165. Psy 210

    What relationship factors or considerations might be influencing Michael’s or Jennifer’s problems?

    asked by Bullzeye
  166. geometry

    2 complementary angles are in the ratio of 5:13. Find the measure of each angle?

    asked by kim
  167. math- CAN SOMEONE PLEASE HELP

    find the two ordered pairs of this equation. y=5/3x+8 then give the slope and y intercept. I know the slope is rise over run and is the y intercept 8? This is the answer I got but I am still really confused how do I get my two ordered pairs this makes no

    asked by KiKi
  168. Precalculus(NEED HELP ASAP PLEASE!!)

    PLEASE HELP!! sin(theta)= 1/3 pi/2 < theta < pi Find: cos(theta)= ______ ? tan(theta)= ______ ? cot(theta)= ______ ? sec(theta)= ______ ? csc(theta)= ______ ?

    asked by jh
  169. computer class

    Which color scheme provides the least ammount of contrast? A. monochromatic B.simple triad C. complementary D. split complementary triad I think its monochromatic but i'm not sure. Also which color arrangement would create the deepst sense of space? A.

    asked by jon
  170. sociology

    unsocialized, spontaneous, self interested component of our personalities a Soul b Aura c "I" is the answer b? i tried to find it in my text book but couldnt thanks so much

    asked by EMH
  171. Pre-Cal

    Find the component form of v given its magnitude and the anlge it makes with the positive a-axis. v=3 v in the direction 3i + 4J Would the component form be (3,4)?

    asked by Hannah
  172. 11th grade-physics

    a cannon with a mass of 1,500kg fired a 7kg cannonball along its 3m long barrel in 0.015 seconds a)calculate the acceleration of the cannonball b)the force acting on the cannonball c) the reaction force exerted on the cannon d)the acceleration of the

    asked by Bill Williams
  173. please help! Examples in book are different!

    train A and b are traveling in the same direction on parallel tracks. Train A is traveling at 40 mph, and B is at 60 mph. Train A passes the station at 12:25 am, and train b passes the station at 12:40 am, what time will train b catch up to train A?

    asked by bob
  174. physics

    Show that a force acting along a given line can always be replaced by a force of the same magnitude acting along a parallel line, together with a couple.

    asked by Edwin
  175. physics

    A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact?

    asked by Edwin
  176. physics

    A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact?

    asked by Edwin
  177. Math

    x + y = 2.2 How do I solve this?

    asked by PLEASE HELP ME!!
  178. chemistry

    What is the of an aqueous solution that is 0.128 M NH4Cl ?

    asked by sab
  179. economics

    Why would flat panel TV prices drop over time?

    asked by rob
  180. Physics

    Mercury vapour is used in as the dominant species which is excited in a traditional fluorescent light. The first and second excited states of Mercury occur at 254 and 185 nm. Calculate the energies of each of these transitions? What equation am i suppose

    asked by Max89
  181. Science

    Determine your distance traveled and displacement if you walk 100m forward and then 35m backward

    asked by Marly
  182. Social Studies

    What were the results of the Battle of Fallen Timbers?

    asked by Rylee
  183. algebra

    Hockey Teams Receive 2 Points When They Win And 1 Point When They Tie. One Season A Team Won A Championship With 65 Point. They Won 10 More Games Than They Tied. How Many Wins And How Many Ties Did The Team Have?

    asked by ron
  184. history

    how did the u.s.involvement in vietnam in the 1950's impact the political climate

    asked by audrey
  185. 7th grade science

    Determine your distance traveled and displacement if you walk 100m forward and then 35m backward please answer as soon as possible thank you

    asked by Mary
  186. chemistry AP

    You have to design a buffer based on one of the systems below System 1: HA1 and A1-1 K= 4 E-3 System 2: HA2 and A2-1 K= 5 E-4 System 3: HA3 and A3-1 K= 6 E-5 For the following parts assume that the buffer above in system2 has been constructed with [HA] =1M

    asked by maya
  187. 7th grade

    WAt dose science Mean

    asked by Brenna
  188. computerclass

    I am so confused,i have no idea what these are When resizing an image for display on a computer monitor you should reduce its resolution to _____? An audio file that is played as it arrives from the internet without saving it to a users computer is called

    asked by fred
  189. Science

    what are new chemicals initiatives or technologies that are used to correct anoxic waters?

    asked by Amy
  190. 7th grade Science

    Describe how the instantaneous speed of a car changes when the car is moving with constant speed , speeding up, and slowing down please answer as soon as possible

    asked by me
  191. Chemistry

    The first excited state of the hydrogen atom is separated from the ground state by 10.2 eV. (a) At what wavelength does this occur and what is the energy difference in kJ mol-1 between the ground and excited states? Show your working in each case. (b) If

    asked by Hobson
  192. 7th grade Science

    Think critiacally how could 2 observers measure a different speed for the same moving object please answer as soon as possible thank you

    asked by me myself and i
  193. science

    how can two observers measure a different speed for the same moving object

    asked by dina
  194. art

    takes on the form of an informative, newspaper advertisement. · describes the cultures, including religion, language, and general philosophies and beliefs. · describes the relationship between the cultures and the arts.

    asked by Anonymous
  195. English

    Thank you very much for your corrections. Can you tell me if the following household chores are possible? Please, let me know if there is a better expression. I have to: sweep, vacuum and mop floors wipe counters, stove top, table and cupboards. sort the

    asked by Franco
  196. Pre-Cal

    Use the law of cosines to find the angle of Q between the given vectors. v=3i + j w=2i - j

    asked by Hannah
  197. sms

    a. The sales representative informs you that there are 56 houses for sale with two floor plans still available. Use x to represent floor plan one and y to represent floor plan two. Write an equation that illustrates the situation. x + y=56 The sales

    asked by tim
  198. algebra

    one canned juice drink is 15% orange juice; another is 5% orange juice. how many liters of each should be mixed together in order to get 10 liters that is 10% juice? how many liters of 15%? how many liters of 5%?

    asked by ron
  199. statistics

    Section 5.3: Normal Distributions: Finding Values Answer the questions about the specified normal distribution. Q1: The lifetime of ZZZ batteries are normally distributed with a mean of 265 hours and a standard deviation ó of 10 hours. Find the number of

    asked by looking for someone to varify my work please
  200. astronomy Confuse

    Time dilation refers to:? A the slowing of time of a moving clock as measured by observer considered to be at rest B increasing time factors as one's speed increases C the slowing of time of a moving clock as measured by the moving clocks D the illusion of

    asked by Anonymous
  201. math

    Can someone help me find the two order pairs of this problem.. 5x+6y

    asked by KiKi
  202. Behavior Science

    Explin the communication process of neurons in the brain. List some common neurotransmitters and describe their effect on behavior.

    asked by Teresa
  203. PHYSICS

    Calculate the maximum amount of stretching (in percent) that a piece of steel can undergo before breaking under tension

    asked by Joey
  204. Math 157

    A 7 inch pizza cost $8 and a 14 inch pizza costs $20. Tommy says the smaller pizza is a better buy because the larger pizza is twice as big and more than twice as expensive. Do you agree with his reasoning? Explain why or why not.

    asked by Lori
  205. chem--electrochemistry

    So in this reaction: Ag(s) + Fe(+3) --> Ag(+) + Fe(+2) we are given 20 grams of Ag(s) to start off with. How do we find how many electrons are transfered in the reaction. And how many grams of Fe(+2) is formed. *for the latter, i think that we can

    asked by Rav
  206. college chemistry

    EPA acidity test can be performed by titrating water sample to a pH of 8.2. What titrant in what concentration would you suggest for EPA acidity determination?

    asked by alissa
  207. phi105

    Susan Moller Okin argued against the theories of Rawls, Nozick, MacIntyre and others. Why? can you be more specific to where I might be able to find the answer.

    asked by trudy
  208. MAth

    f(x)=x^2-9x+3

    asked by Help
  209. algebra

    I need help! Solve by the elimination method: 7r-9s=-12 9r+7s=96 When I do this, I get a crazy fraction, and I know the answer is a point. (r,s) But what I'm getting is ridiculous. I got -564/130=s! That has to be totally wrong!

    asked by bob
  210. math

    find the two ordered pairs from this equation. y+x=-2 then give the ordered pair of the y intercept?

    asked by KiKi
  211. calc

    find the critical no's/ points in (X^-2)(lnx)

    asked by Mia
  212. math

    Help! These are fractions, so bear with me: -5/8 x= -9/10 Solve with the multiplicaation principle. How do I do this? The fractions throw me off every time!!!

    asked by bob
  213. math substitution method

    use the substitution method to solve 7x+5y=-26 x=28-6y

    asked by KiKi
  214. science

    Explain how a fossil mold different from a fossil cast

    asked by pAvLeEn
  215. Statistics

    True or False Alpha level becomes zero only when both samples reflect different populations.

    asked by RMJ
  216. geometry

    sketch a number of pens that can be constructed using 24 m of fencing

    asked by sadie
  217. math

    how do I solve this? I know it's common math, but I cannot remember how! -4x> 1/11 I think I multiply both sides by 11, but..... I can't remember how!

    asked by bob
  218. math

    I need help! Solve by the elimination method: 7r-9s=-12 9r+7s=96 When I do this, I get a crazy fraction, and I know the answer is a point. (r,s) But what I'm getting is ridiculous. I got -564/130=s! That has to be totally wrong!

    asked by bob
  219. math-graphing

    How would I graph the equation y=6?

    asked by KiKi
  220. Math 30

    How would I do this question. What sample size was needed to obtain an error range of 2% if the following statement was made. 75% of the workers support the proposed benefit package. The results are considered accurate to within + or- 2%, 18 times out of

    asked by Rae
  221. word problem

    train A and b are traveling in the same direction on parallel tracks. Train A is traveling at 40 mph, and B is at 60 mph. Train A passes the station at 12:25 am, and train b passes the station at 12:40 am, what time will train b catch up to train A?

    asked by bob
  222. science

    If you add solids ( ie. salt and pepper) to water, does it become more dense? Thanks to all who answer!!!! Wizard

    asked by wizard
  223. geology

    I am looking for some ideas of various geological events of Florida

    asked by nicole
  224. chm152

    At a particular temperature, Kc = 54 for the reaction H2(g) + I2 (g) 2 HI(g). One mole of HI is placed in a 3.0-L container. What would be the equilibrium concentration of HI? Choose one answer. a. 0.035 b. 0.071 c. 0.29 d. 0.30 e. 0.33

    asked by AMI
  225. Physics

    E2 (total) of rod (of length L = 9.15 mm) = 4.18 ×10^3 V/m. E1=1.76 x 10^3. E3=1.57 x 10^3. The rod consists of three sections of the same material but with different radii. The radius of section 3 is 2.27 mm. What is the radius of (a) section 1 and (b)

    asked by Shawn
  226. definition

    what does the quote, "you can never take for granted," mean?

    asked by AL 87
  227. cultural diversity

    were the native americans affected by dual labor market, environmental justice issues, affirmative action, redlining, double jeopardy, institutional discrimination, reverse discrimination, glass ceiling, glass walss or glass escalator?

    asked by Cindy
  228. sci

    wat is body fossil

    asked by pavleen
  229. Math

    x + y = 2.20 How do I solve this?

    asked by Ann
  230. math

    Relative humidities (represented by RH below) of less than 51% cause problems in growing crops. The Saskatoon region is a prime wheat-growing area. The mean RH in Saskatoon is 59% in July, with a standard deviation of 8%. The RH for the days in July forms

    asked by ken
  231. Science

    What is insulating fiberglass?

    asked by Christina
  232. math

    Determine the area between the z-scores in each pair for a normal distribution. Round your answers to 4 decimal places. (a) 1.12 and 1.98 (b) –2.12 and –1.0

    asked by jason
  233. Science

    What is sodium perborate bleach?

    asked by Christina
  234. English

    What is the best topic to write a satire on?

    asked by 11th grade
  235. Help plz?

    An example of aphersis is: a}account b}phone c}typewriter d}reconcile

    asked by lidsey
  236. spanish

    I need to fill in the blanks with the correct indirect or direct pronouns. Voy a compara esta corbata para mi papa. Voy a ------------- para su cumpleanos.

    asked by tina
  237. Accounting

    to find noncontrolling?? you add the common stock and retained earning and then minus the investment? is this correct

    asked by Karla
  238. Math

    the ratio of 8ft. to 4 yd

    asked by Vickie
  239. psychology

    Which color arrangement wouldcreate the deepest senseof space? A. red,orange,blue B. Green violet, blue C.Yellow, orange,yellow-orange D. Violet, blue-violet, red-violet What are the double split complement colors for blue-green?

    asked by Jake
  240. math115

    There are 42 milliliters (mL) of acid in 200 mL of a solution of acid and water. What percent of the solution is acid?

    asked by Bstone
  241. Problem Posting

    trying to post a question, but it says I'm not allowed to post internet addresses--but I'm not. any ideas on this?

    asked by Val
  242. chemistry

    This is super confusing complex brain killing A column packing for chromatography consists of a mixture of two types of particles. Assume that the particles in the batch being sampled are spherical with a radius of 0.5 mm. 36% of the particles appeared to

    asked by Simon
  243. sewing

    explain the key and basic factors?

    asked by Mel
  244. chemistry

    At STP, 412 ml of gas have a mass of 2.60 g. What is the molar mass of gas?

    asked by Peggy
  245. English II

    When someone says he blockade me with a chair. What is the word blockade movement compared to?

    asked by Betty
  246. algebra

    plans, under plan A, Giselle would have to pay the first 130 dollars of her nedical bills plus 35% of the rest. Under plan B Giselle would pay the first 210 dollars but only 20% of the rest. for what amount of medical bills will plan B save Giselle money?

    asked by ron
  247. health

    I have to describe how research has made possible any medical advances in AIDS, and I've tried searching it on bing. I need some website suggestions.

    asked by AL 87
  248. algebra

    hocky teams receive 2 points when they wi and 1 point when they tie. One season, a team won a championship with 65 points. they won 10 more games than tied. how many wins and how many ties?

    asked by ron
  249. statistics

    A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of .5 ounces. What is the probability that a loaf of bread is < 20.75 ounces?

    asked by Anonymous
  250. Statstics

    A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of .5 ounces. What is the probability that a loaf of bread is

    asked by Anonymous
  251. algebra

    the body mass index is given by the formula, or model, I=700w/h(2), where w= weight and h = height in inches. Jerome is 76 inches tall. what weight will keep his body mass index between 25 and 33 Jeromes body mass index will fa;ll between 25 and 33 for the

    asked by ron
  252. Chemistry

    What are the molar heat capacities of: H2O(l) NaCl and Tungsten? I got 75.32 J/K*mol 50 J/K*mol 24.8 J/K*mol

    asked by Ana
  253. algebra

    two angles are complementary. the sum of the measure of the first angle and half the second angle is 87 degrees. find the measure of the angles. What is the measure of the smaller angle? what is the measure of the other?

    asked by ron
  254. Science please i need help!!!!!!!!!!

    how can two observers measure a different speed for the same moving object

    asked by dina
  255. Science Please I NEED Help!!!!!!!!!!!!!!!!!!!!!!!!

    Describe how the instantaneous speed of a car changes when the car is moving with constant speed , speeding up, and slowing down please answer as soon as possible

    asked by dina
  256. Physics

    The first line of the Balmer series in Hydrogen atom corresponds to the n=3 to n=2 transition, this line is known as H-alpha line. What would be the selection rule for the n=3 to n=2 transition and corresponding lifetimes.

    asked by Akshay
  257. algebra

    Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 60 miles per hour and train B is traveling at 70 miles per hour. Train A passes the station at 10:15 p.m. If train B passes the same station at 10:27 p.m, at

    asked by Anonymous
  258. math-slope

    would the slope of (0,3) and (-6,-3) be -6/-6?

    asked by KiKi
  259. ALGEBRA

    Examine the following equation: y = -2x^2 + 20x + 1 * What shape does the graph of this equation make? (Hint: You should be able to tell just by looking at the first term of the equation.) * Does the graph open up or down (Hint: You should also be able to

    asked by GGIFT
  260. history

    i have to do a power point presentation of 6-9 slides. no more than 1/3 of the presentation can be pics. i have to include speaker notes and references. it also must include at least 1 in-text citation. Explain how the U.S. became involved in the politics

    asked by nicole
  261. science

    Explain the function of ATP synthatase in both photosynthesis and cellular respiration.

    asked by sarah
  262. geology

    what is a popular geological feature of florida

    asked by nicole
  263. math

    6x-4y=20 and 4y-6x=-20 What is the solution of the system of equations for this problem? A)A point B)No solution C)Infinitely many solutions These points would have C correct?

    asked by KiKi
  264. ESL

    How do the varieties of standards available to teachers provide a focus on high expectations and the motivation needed to tailor instruction to meet the needs of the learner?

    asked by JEAN
  265. cultural diversity

    did the native americans face prejudice, segregation, racism, or any combination of the three?

    asked by Cindy
  266. phi105

    Susan Moller Okin argued against the theories of Rawls, Nozick, MacIntyre and others. Why? Anyone?

    asked by trudy
  267. math-slope and y intercept

    find the two ordered pairs of this equation. y=5/3x+8 then give the slope and y intercept. I know the slope is rise over run and is the y intercept 8?

    asked by KiKi
  268. MAth

    f(x)=x^2-9x+9

    asked by Help
  269. math

    i need help simplyfying this question it is 8-5b-1. show me how you do it step by step. i would not mind a few notes

    asked by Alexa
  270. math

    Would a drop of 40 Celsius degrees be more or less than a drop of 40 fahrenheit degrees? explain why C = 5/9 (F - 32)40-32=8c F = 9/5 C + 32 40+32=86f

    asked by Dylan
  271. science

    make inferences to answer the foeoling question: At which pencil point was oxygen produced? can u help me plz?

    asked by Star
  272. math (advanced alg and trig)

    Solve to the nearest minute: x is greater than or equal to 0 and less than 360. 3sec^2 x-8tan-6=cotx

    asked by Anne
  273. statistics

    the life expectancy of lung cancer patient treated with a new drug is normally distributed with a mean of 4 years and a standard deviation of 10 months what is the probability that a randomly selected lung cancer patient will last more than 5 years

    asked by yolanda
  274. nutrition

    a 1,400- to 1,750-word paper in APA format outlining your healthy eating plan. You must discuss the following:

    asked by Anonymous
  275. Rigor Mortis

    When does rigor mortis occur?

    asked by Lena
  276. calc

    how to find the integral of this function x^2 * root(x^3+1)

    asked by James
  277. chemistry

    what happens when bicycle tyre bursts in summer due to adiabetic expantion?

    asked by swagat
  278. Math

    If a bottle and a stopper cost $1.10. How much does the stopper cost?

    asked by Bob
  279. Science

    what can you say about the ages of two wild separted layers of rock that contain the same type of fossil

    asked by pAvLeEn
  280. Pre-Cal

    Find the vector v with the given magnitude and the same direction as u. Magnitude: v=3 direction: u=(4,-4) I am not sure what to do here or how to start.

    asked by Hannah
  281. math- like terms

    collect like terms 10c+5d-5c-8d= 5c+3d? is this correct?

    asked by KiKi
  282. Math

    If the volume of the rectangular prism is 360cm3 and the height is 28cm, what is the width and the length?

    asked by Sara
  283. Psycology

    Compare and contrast the roles that ethics and laws play within human service organizations

    asked by Kitty
  284. PAS

    what type of slanter is this; face it, honey!! you're not as good as me and you never will be!!

    asked by Anonymous
  285. Algebra

    If a bottle and a stopper costs $1.10. How much does the stopper cost?

    asked by Greg
  286. Precalc

    I think it was skiped can you post resposne in this question h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 9 8 2 9 1 7 1

    asked by Kate
  287. english

    is this correct: A street and a school were named after Sophie Germain. is it were or was?

    asked by Sara
  288. Science

    How do you create a perfect urbanization powerpoint slideshow and where do i found the facts from?

    asked by Nary
  289. Science Please give me a hint thank you

    how can two observers measure a different speed for the same moving object

    asked by Asia
  290. concepts in Organizational Behavior

    You are currently working as a management consultant. You and your partner have been asked to analyze the corporate culture and organization of USA Today. You have decided to use the Step-by-Step Analysis to aid you in your work. You have decided to

    asked by Azizeh
  291. 9th grade conceptual physics

    How do you find the cargo capacity for a boat?

    asked by Sara
  292. Calculus

    Find the derivative of y=cos(squarerootsin(tzn(pi*x)))

    asked by Stephanie
  293. math

    Help! These are fractions, so bear with me: -5/8 x= -9/10 Solve with the multiplicaation principle. How do I do this? The fractions throw me off every time!!!

    asked by bob
  294. bio

    Explain the roles of helicase and polymerase in DNA replication.

    asked by Anonymous
  295. Biology / Biochemistry

    How will the conformation of an Enzyme (a protease) be affected when the amino acid residue is substituted with glutamate instead of glutamine?

    asked by Alan