Questions Asked on
May 4, 2010

  1. Chemistry

    When 0.3212g of glucose was burned in bomb calorimeter of calorimeter constant 641J/K, the temperature rose by 7.943 K. Calculate a) the standard molar internal energy of combustion b) the standard enthalpy of combustion and c) the standard enthalpy of

    asked by Nadira
  2. Curves defined by parameteric equations

    Consider the following. x = e^t - 12 y = e^2t (a) Eliminate the parameter to find a Cartesian equation of the curve.

    asked by Mike
  3. chemistry

    max electrostatic potential is where there are low electron density, does it mean that the larger the number of max potential indicates a strong acid strength

    asked by bme1
  4. chemistry

    Sodium chloride is decomposed into the elements sodium and chlorine by means of electrical energy. How many grams of chlorine gas can be obtained from 2.50 mol NaCl?

    asked by anna
  5. chemistry

    does a low dipole indicate a strong acid

    asked by bme1
  6. math

    Could you help me in solving the following problem? If x varies inversely as the square of y and x=2 when y=1 find x when y=2

    asked by vidya
  7. Math (URGENT)

    Use calculator - answer correct to 3 places. a. 3sqrt17 + 2sqrt15 / 5sqrt7 = 10.644 b. 2sqrt11 - 3sqrt2 + 15sqrt10 + 5sqrt5 = 61.005 c. 4.3sqrt6.9 / 1.7sqrt57 = 50.163 Can someone check my answers? I keep getting the feeling these are not the right

    asked by Cody
  8. physics

    A series RCL contains 150 ohm resistor, a 1.75x10^-6F capcitor and inductance of inductor 0.035H and voltage of generator 60.0 Hz. Determine its total impedance. a) 1500 ohm b) 1900 ohm c) 1700 ohm d) 500 ohm e) 300 ohm

    asked by seema
  9. physics

    what would the speed of an observer be if a red(4.688x10^14Hz) traffic light appeared green(5.555x10^14Hz) to the observer? a) 2.219x10^8 m/s b) 4.445x10^8 m/s c) 5.548x10^7 m/s d) 8.438x10^7 m/s e) 2.890x10^6 m/s

    asked by seema
  10. algebra II URGENT

    if peter received grades of 88,83,75,and 80 on four tests in English, what is the minimum grade he has to score on the fifth test to have an average of at least 85 for the course?

    asked by bev

    Three small spheres are placed at fixed points along the x-axis, whose positive direction points towards the right. Sphere A is at x = 23.0 cm, with a charge of -10.00 microCoulomb Sphere B is at x = 55.0 cm, with a charge of 2.00 microCoulomb Sphere C is

    asked by Jay
  12. chemistry

    ind the partial pressure of oxygen in a sealed vessel that has a total pressure of 2.6 atm and also contains carbon dioxide at 1.2 atm and helium at 0.10 atm.

    asked by jerkoff
  13. chemistry URGENT

    What is the total gas pressure in a sealed flask that contains oxygen at a partial pressure of 0.39 atm and water vapor at a partial pressure of 0.47 atm?

    asked by jerkoff
  14. chemistry

    what happen when a solution of NaoH is add in drop and then in excess to Cacl

    asked by kay
  15. MAth

    The graph of the function y=x^3+12x^2+15x+3 has a relative maximum at x=

    asked by AKilah
  16. geometry

    Draw three different nonconvex polygons. When you walk around a polygon, at each vertex you need to turn either right (clockwise) or left (counterclockwise). A turn to the left is measured by a positive number of degrees and a turn to the right by a

    asked by kristi
  17. algebra

    Which point is a solution of the inequality 1/2x - 4y

    asked by letes
  18. algebra

    A rancher is putting up a rectangular electic fence to contain some horses. The rancher has 1200 feet of electric wire. The fence needs to be at least 120 feet in one direction in order to contain the barn. Which system of linear equalities describes the

    asked by letes
  19. Trig

    Solve the equation in the interval [0•,360•] Csc theta = 1+cot theta

    asked by Stacey grahaM
  20. college

    What is equivalent to 6/7=x/y^2

    asked by Anonymous
  21. french

    le samedi, je joue ou tennis avec mon per'e

    asked by david
  22. college

    On a radio ad: “Have you been fatigued, irritable, moody? If these symptoms are ignored, you might become depressed or even suicidal! Ward off the blues by taking a pill proven to cheer you up. Millions of people have, and they’re glad they did!”

    asked by Anonymous
  23. 6th grade math

    i need to write 40% as a fraction in simplest form how do i do that

    asked by darlene
  24. chemisry

    A 0.125 gram sample if a monoprotic acid of unknown molar mass is dissloved in water and titrated with 0.1003 MNaOH. The endpoint is reached after adding 20.77 ml of base. What is the molar mass of the unknown acid?

    asked by janny
  25. physics

    A block of mass m= 100kg rests on a level ground. With what force, parallel to the ground, must you push the block so that it is just ready to start sliding? The coefficient of static between the block and ground is 0.40.

    asked by Dail
  26. chemistry

    How much energy is released when 2.55kg of diethyl ether freezes?

    asked by janny
  27. 11th grade

    The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?

    asked by katlyn
  28. physics

    A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s?

    asked by Anonymous
  29. Physical Science

    How do I write and balance this chemical equation as a double replacement reaction: K2SO4(aq) + PB(NO3)2 (aq)

    asked by Carissa
  30. pheonix university

    Please select one of the following thesis statements: 1. America's top corporations are successful for a variety of reasons. 2. Scientists have discovered human remains thought to be more than 2 million years older than Lucy, a skeleton found in Ethiopia.

    asked by mark
  31. algebra

    Rashid is helping to plan a cookout. He determines that making one making one hot dogs costs 55 cents and making a hamburger costs 90 cents. The cost must be no more than $50, and he knows that he must at least 60 hot dogs and hamburgers. Which system of

    asked by wan
  32. microbiology

    Dilution Dilution Factor Colony Count 1:10000 10000 4720 1:50000 50000 1020 1:250000 250000 194 1:1000000 1000000 23 can you tell me how to calculate the colony count of the hypothetical water sample is _______CFU per ml.Thanks!

    asked by albee
  33. trig

    use the calculator to find the trigonometric values. express your answers in ten-thousandths. sin 53 degrees 30 ft

    asked by trish
  34. general

    Can you please tell me what is the Percentage of 250,800.00/2,175,000 I have 11.53% is this correct.

    asked by Martha
  35. chemistry

    Calculate the sodium ion concentration when 55.0 mL of 4.5 M sodium carbonate is added to 15.0 mL of 3.0 M sodium bicarbonate.

    asked by bob
  36. Math

    Find the area of the parallelogram that has the vectors as adjacent sides. u = i+2j+2k v = i+k I know that I have to use (-2,-2,2) sqrt (1-2)^2 + (2+2)^2 + (2-2)^2 = sqrt17 Area = sqrt 17. Is this correct?

    asked by Abbey(Please check)
  37. human service

    what are the most important issues for a human service agency to address in fee setting?

    asked by Deb
  38. Intermediate Algebra

    what is the meaning term rational expression Please give me an example how to divide rational expressions

    asked by rosa
  39. physics

    a blockof mass 100 kg tied to a donkey that moves with constant accelaration of 20centimeter over second squared up a 30 degrees incline. what is the force with which the donkey pulls on the block parallel to the incline? The coefficient of kinetic

    asked by dai
  40. Maroeconomics

    Question 02: Consider an economy described by the following equations: Y=C+I+G Where, Y = 6,000, G = 2,000, T = 2,000 C = 300 + 0.50 (Y-T) I = 2,000 – 60r In this economy, compute: a. Private saving b. Public saving c. National saving d. The equilibrium

    asked by Abdul
  41. physics

    you are riding on a 20 meter diameter ferris wheel. when your cart is at the bottom. you feel as heavy as you normally are. what is the speed of the wheel

    asked by dai
  42. Chemistry

    A solution is prepared by dissolving 15.6 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 10.00 mL sample of this stock is added to 52.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final

    asked by Anonymous
  43. Algebra

    How do you add or subtract rational expressions with unlike demoninators please explain with examples

    asked by rosa
  44. Knowledge Management

    Tacit knowledge, Explicit knowledge, General knowledge and Specific Knowledge are different types of knowledge. Case (A) An industrial engineer who has specialized in rust preventing techniques wants to build a car that would be resistant to the affects of

    asked by Abdul
  45. geometry

    A right cylinder has a radius of 3 and a height of 12. What is its surface area? If necessary, round your answer to two decimal places.

    asked by josh
  46. Math

    Find the angle Q between the two vectors. u = 10i + 40j v = -3j+8k cos / sqrt1700 sqrt73 cos(-120/sqrt1700 sqrt73) = .9072885394 arc cos (.9072885394) = 24.86 degrees. Is this correct?

    asked by Abbey(Please check)
  47. geometry

    What is the distance between the origin and the point (5, -19)? If necessary, round your answer to two decimal places.

    asked by Anonymous
  48. Trig

    (2-2i)^5 find the given power write answer in rectangular form

    asked by Stacey grahaM
  49. 12th grade

    A thimb is 23.0 cm from a concave mirror. The focal point is 9.0 cm. Where is the image located?

    asked by Daniela
  50. chemistry

    Calculate the molarity and mole fraction of a 2.35 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the final volume equals the sum of the volumes of acetone

    asked by bob
  51. Marketing

    Supposed you have been hired as a Marketing manager in a Food Supplement Company. Your company is planning to introduce Packed Branded Fresh Vegetables in the market. Selected target market for your company is Lahore. Now you are required to prepare an

    asked by Royal
  52. chemistry

    Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 180. g of glycerin to 321 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.

    asked by bob
  53. chemistry

    A solution is prepared by mixing 0.0433 mol CH2Cl2 and 0.0623 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2

    asked by bob
  54. english

    What does this mean? If you are home studying…I hope you’re at least doing so outside! I am foreign exchange and I do not understand this. Thank You.

    asked by Jose
  55. childcare

    Following the nutritional label on the jar of peanut butter. you determine that 1 ounce of the peanut butter contains 115 calories and 9 grams of fat what percent of calories come from fat? A.30 b.40 c.70 d.80

    asked by Nicole
  56. %%%%

    what is the formula for finding a percentage of a dollar amount??? ex. 30 % of 233 is ??? Please help me! Thanks!

    asked by abby
  57. childcare

    Why is the incubation stage of illness of concern to day care workers? A. child in this stage require a great deal of care and special attention. B.child in this stage often need special medical help c.child in this stage can often pass on the disease even

    asked by Nicole
  58. Physical Science

    What is the apparent contradiction in the statement that "solar energy is free" with the fact that solar cells are too expensive to use as an energy source.

    asked by Sue Ann
  59. all

    What does it mean when a school has a web based curriculum?

    asked by Mattie
  60. algebra

    4 + (sqrt-4) + i

    asked by sam
  61. Calc

    if the integral ( [ ) ([ f(t) ,t, 0, 8) = k Find [ (3x^2f(x^3), x, 0, 2)

    asked by Lucy
  62. English

    Can you check if these sentences are possible? Thank you for your invaluable help. 1) Remember to pick the children up at (or from?) the airport. 2) She promised she would give us a lift. She promised to give us a lift. 3) He is going to take the dog out

    asked by Franco
  63. science

    why do teachers tell u to go do some homework...and they have not taught u it huh???

    asked by millie
  64. 8th grade

    1 methods of controlling fullness. 2 what is fastening. 3 uses of fastening. 4 pictures of methods of controlling fullness. 5 what is controlling fullness.

    asked by georgian
  65. clothing and textile

    1 what does disposal of fullness means

    asked by georgian
  66. Biology

    In many cases, not all of Koch's postulates can be applied to determine the cause of a human disease. Explain why.

    asked by CC
  67. geometry

    basis of a right prism is a rhombus with a diagonal 8cm and 6cm.the prism height i is 12cm.find:a)the general area of prism.b)the side of prismsusurface.diagonals cutting surfaces.c)prism volume.

    asked by Anonymous
  68. COM 220

    I have to post a topic for my final project to be accepted by my instructor. I want to write a persuasive essay about drugs. My first thought was to write about why drug users use drugs but as I research this there does not seem to be anything. Do you have

    asked by Anonymous
  69. Calculus II

    How do you integrate the function -- > sinx (4^cosx) from 0 to pi/2 I did "u-substitution" to make it the integral from 1 to 0 of 4^u but then i don 't know where to go from there! Thank you

    asked by Mary
  70. Math

    Find the angle Q between the two vectors. u = 10i + 40j v = -3j+8k cos / sqrt1700 sqrt73 cos(-120/sqrt1700 sqrt73) = .9072885394 arc cos (.9072885394) = 24.86 degrees. Is this correct?

    asked by Abbey(Please help)
  71. chemistry

    What is the pH of a solution that is 0.20 M CH3COOH and 0.10 M CH3COONa?

    asked by curtis
  72. Pre-algebra

    Say that you have a triangle with sides a = 20, b = 48, and c = 51. True or false: this triangle is a right triangle.

    asked by Olivia
  73. Math

    use Demoivre's Theorem to find the indicated power of the complex number. Express the result in standard form. (2+2i)^6 a=2 b=2 n=6 r=sqrt 2^2 + 2^2 = sqrt8 Q=7pi/4 (sqrt8)^6 = 512 512(cos 6/1 x 7pi/4) + i sin 6 x 7pi/4 512 (cos 21pi/2) + i sin (21pi/2)

    asked by Abbey(Please help)
  74. chemistry

    a 14.7g ice cube is placed into 324g og water. calvulate the temperature change in the water upon complete melting of the ice. hint: determine how ,uch heat is absorbed by the melting ice and then use q=mc delta T to calculate the temperature change. use

    asked by janny
  75. science

    which best describe the desert? a.thick,waxy leaves b.many large leaves. c.a shallow root system.d.a tall,woody stem.

    asked by kim
  76. Chemistry

    For the reaction NaOH + HCl---> H20 + NaCl where the mass of NaOH is 2g and the Volume of Hcl is 100ml with a 0.5 concentration. The initial temp is 25 and the final is 35, what is the amount of energy absorbed by the solution?

    asked by Hyde
  77. Business Math

    Date of Note March 11, length of note 200 days, Date of discount, June 28. What is the maturity date and the discount period, no leap years, exact days

    asked by Kathy
  78. Math

    Logs are stacked up in apile as shown in the figure. The top row has 15 logs and the bottom row has 21 logs. How many logs are in the stack? a1= 1+14=15 an= 7+14=21 s1=(n/2)(a1+an) (n/2)(15+21) = 18 How do I figure out the n?

    asked by Abbey(Please help)
  79. Basic College Math

    What numbers in a math problem adds up to 331/3?

    asked by Ronnie
  80. LAL

    CHECK PLEASE are theses ALL complex sentences? 1.i will help you with your homework after you watch the baby. 2. jake stared at me as if he had seen a ghost. can order whatever you want from the menu. 4.we will be on time unless there is a traffic

    asked by Sara!
  81. Chemistry

    To increase the solubility of a gas at constant temperature from 1.20 g/L at 1.4atm to 2.3 g/L the pressure would have to be increased to ______ A. 0.37 atm B. 0.7 atm C. 1.37 atm D. 2.7 atm

    asked by Kathie
  82. business

    Consider the wide spectrum of business organizations, ranging from gigantic corporations to working at home. Describe at least three types of business organizations that you are familiar with or that you would like to know more about. How is each one

    asked by DC
  83. English

    How to write a type sketch of "the healthy eater"?

    asked by Danny
  84. Math

    use Demoivre's Theorem to find the indicated power of the complex number. Express the result in standard form. (2+2i)^6 a=2 b=2 n=6 r=sqrt 2^2 + 2^2 = sqrt8 Q=7pi/4 (sqrt8)^6 = 512 512(cos 6/1 x 7pi/4) + i sin 6 x 7pi/4 512 (cos 21pi/2) + i sin (21pi/2)

    asked by Abbey(Please help)
  85. Chemistry

    Dilution calculation: use the formula M1V1=M2V2 How many milliliters of 12 M HCl would be needed to make 200 mL of a 1.0 M HCl solution? I got 16.67 mL HCl for this part but there's a secondary question. It says: How much water would be used to make this

    asked by Ana
  86. math

    A sheet of plywood measures 4 feet by 8 feet. Armand wants to build a dog house using one whole sheet of plywood for the floor. a. Armand needs to put a "2 by 4" under the outer edges all the way around the floor, and another "2 by 4" that runs down the

    asked by NICK
  87. LAL


    asked by Sara!
  88. chemistry!

    An ideal gas has a volume of 3.0 L. If the number of moles of gas and the temperature are doubled, while the pressure remains constant, what is the new volume?

    asked by jenny
  89. Chemistry

    For the reaction NaOH + HCl---> H20 + NaCl where the mass of NaOH is 2g and the Volume of Hcl is 100ml with a concentration of 0.5 mol/l. The initial temp is 25 and the final is 35, what is the amount of energy absorbed by the solution?

    asked by Hyde
  90. chemisty

    How many moles of carbon monoxide form at the same time that 0.337 mol CS2 forms?

    asked by jake callienf
  91. Chemistry(URGENT, PLEASE HELP!)

    the volume of alcohol present in 620 mL of a 40% (v/v) solution of alcohol is ______? A. 372 mL B. 40 mL C. 248 mL D. 580 mL

    asked by Kathie
  92. Environmental Science

    For my environmental science reseaerch paper on coral reefs I wanted to copy this intro paragraph from my workbook: Coral reefs are the second richest ecosystem or interdependent environment on Earth. They have been called the rain forests of the oceans

    asked by y912f
  93. matg


    asked by gorge
  94. math

    paul did 9 tricks in 2 minutes and 15 many seconds did each trick take?

    asked by harry
  95. Language arts

    What are the verbs in this phrase: Hawaii is one of the most beautiful places on earth

    asked by Fabian
  96. Math

    Find the center, vertices, foci, and eccentricity of the ellipse. 9x^2 + 4y^2 - 36x + 8y + 31 = 0 I know the center is (2,-1) For the vertices I had (3,-1)(1,-1) and the foci (3.8,-1)(.20,-1) and e = 1.80 but I think these are wrong.

    asked by Abbey(Please help)
  97. 9th grade algebra

    daniels print shop purchased a new printer for $35,000. Each year it depreciated at a rate of 5%. What will its approximate value be at the end of the fourth year?

    asked by sophia
  98. Language arts

    What are the verbs in this phrase: The earth has seven continents

    asked by Fabian
  99. Please help!!!!!!!!!!! algebra

    Quan is shopping. He can buy 2 pairs of pants and 1 shirt for $79.85 ( before tax is added). He can but 1 pair of pants and 2 shirt for $69.85 (before tax is added). To figure out how much a shirt or a pair of pants costs,you must first identify the

    asked by Gabriel
  100. Calculus

    Two forces, F1 and F2 act on an object and the angle between them is 60 degrees. Determine the magnitude and the direction of the resultant force FR relative to F1 if F1= 50 N and F2= 30 N.

    asked by Ariza
  101. reading

    how is U.S. water use similar to that "water-poor" countries? how is it different?

    asked by Sara!
  102. Calculus

    A boat crosses a river and arrives at a point on the opposite bank directly across from its starting position. The boat travels at 4 m/s and the current is 2m/s. If the river is 600 m wide in what direction must the boat steer and how long will it take to

    asked by Abbie
  103. math

    Max is having a party with 38 people. He wants enough cupcakes to feed If cupcakes are sold in packs of 6, how many packs will he need to buy? Put the answer in a complete sentence.

    asked by Alvin
  104. Calculus

    A car is heading northwest at 80Km/h and a truck is heading east at 60 Km/h. Determine the velocity of the truck relative to the car.

    asked by Bobby
  105. Calculus

    A pilot wishes to reach an airport 350 Km due east from his present position. The wind is blowing from N25degreesE with a speed of 80 Km/h and the planes airspeed is 400 Km/h. What ground speed and what heading should the pilot steer to reach the airport?

    asked by Ariza
  106. french

    How to answer the question: Est-ce que vous amis vous ont telephone?

    asked by Michael
  107. child pahcology

    I need help understanding Erickson's first five stages. I need examples of them to help me write a paper.

    asked by Tammera
  108. child psychology

    I need help understanding Erickson's first five stages. I need examples of them to help me write a paper.

    asked by Tammera
  109. History/9th grade

    I am trying to understand and I hope you can help me. I just want some more explaintion about the great depression. Why do people call it a leveler? I heard some kids over at the table next to me at lunch today. Like I said I just want to know. I am

    asked by Nanci
  110. math

    A fund drive announced that it has raised $3276, which is 70% of its goal. How much more must be raised?

    asked by Anonymous
  111. Earth Space Science

    What type of motion would have to occur to move or displace the fixed color lines produced by a gas like helium or hydrogen toward the 400 nanometer mark on the spectrum scale?

    asked by Paige
  112. Math

    Eliminate the parameter and write the corresponding rectangular equation whose graph represents the curve. x = sec Q y = cos Q x^2 + y^2 = 1/cos^2 + sin^2/cos^2 = x^2(1 +sin^2) = x^2(2-cos^2) x^2(2-1/x^2) = 2x^2 - 1 x^2 - y^2 = 1 My teacher said to use

    asked by Abbey
  113. math

    How can you use the multiplication facts for 3 to help you find the Multiplication facts for 9?

    asked by Brianna S.
  114. Great Depression and Great Leveler/History

    Hi, I just want to know if I am correct on my answer about the Great Depression and Great Leveler. I wrote, "The reason why it was called the Great Leveler was because every person was affected regardless of race and gender. Americans underwent many

    asked by Lauri
  115. english 8th grade PLEASE HELP!!!

    How can you identify a verb/verb phrase, and how can you tell if it is present, past, future, pres. perf., past perf., future perf.?

    asked by May
  116. science

    What is an ion?

    asked by Karishma
  117. Paralegal Studies

    I am doing a research project for Business Law 2 from Penn Foster. has anyone done th perticular assignment? i cannot figure out the first part about corporations, non-profit, and limited liability companies?

    asked by Sarah
  118. To SraMcJin

    Sra, I want to thank you for all your help on my English poetry. You really are good at poetry. Thank you very much, I really appreciate it:-)LOL

    asked by Sara
  119. HIstory

    How did the Industrial Revolution impacted American Society economically, socially, politically, and morally.

    asked by Zack
  120. math

    What is the unit price of 5 for $2.50

    asked by Gio
  121. English

    Recall an event when you became aware of the importance of dividing chores evenly and fairly without being influenced by gender. Can someone please explain this a little more clearly to me, I kind of get what it says, but I am not able to remember about

    asked by Sara
  122. biology

    explain and illustrate how the long-term survival of a species depends on resources that may be limited from time to time

    asked by Tooba
  123. math

    what is a fraction between 1/3 and 2/3?

    asked by Joe

    2H20(l) = 2H2 (g) +O2 (g) For the above, if 1.50 mg of water is decomposed, what mass of hydrogen is procduced? (1 mg=10^6g=1 metric ton)? I came up with 0.1678475161 and rounded it to .17 mg H2. Am I on the right track and did I include the correct amount

    asked by Carli
  125. Grade 10 math

    Expand and simplify : (x+6)^2 (b+9)(b-9)

    asked by raman
  126. Chemistry

    NH3(g) + 2O2 (g) = HNO3 (aq) + H2O (l) How do I calculate the oxidation states of Nitrogen and figure out if it is reduced, oxidized or neither? My answer is below. I am not sure if I am figuring it right. Please advise. NH3(g) + 2O2 (g) = HNO3 (aq) + H2O

    asked by Carli
  127. trigonometry HARD!!

    An airplane flies due north from a starting point at 234.6 mph for 40 minutes. Then turns flying 20 minutes at 252 mph in the direction N 20 degree 31 minutes East. How many miles is the airplane from the starting point?

    asked by jake
  128. Chemistry

    a solution is prepared using .015 L of 1.0 M HCl and .020 L of .50 M HNO3. the final volume of the solution is 1.25 L. Answer th following questions. a)what are the [H3O+] and [OH-] in the final solution? b)What is the pH of the final solution?

    asked by Alexa
  129. Math

    What is 54.9*10 to the 6th power in scientific notaion

    asked by Caitlyn
  130. Chemistry

    Geraniol is a compound found in rose oil that is used in perfumes. What is the molas mass of geraniol if its vapor has a density of 0.480 g/L at a temperature of 260.0 degrees Celsius and a pressure of 0.140 atm???

    asked by Meg
  131. world history

    Given the location of the Alps, how might they have been both a help and a hindrance to the development of Italy?

    asked by Tyson
  132. Physics

    Could someone please tell me what equations i am suppose to use to work out these problems. A capacitor in RC circuit has two overlapping plates of width 3.40 m and length 8.90 m separated by 2.60 cm. A dielectric of dielectric constant being 73.0 fills

    asked by Sam
  133. English

    Describe a memorable teacher who had a significant positive effect on you. There hasn't really been any teacher in high school like that. But, in elementary school I had quite a few. Once it was in grade one, I had to go to the hospital for a couple of

    asked by Sara
  134. hcr 230

    post a 150-300-word response to the following discussion question by clicking on Reply. Explain whether or not you believe Medicare’s eligibility limitations are reasonable in scope.

    asked by Anonymous
  135. mgt

    what is evauation of objectives?

    asked by me
  136. mgt

    what is evauation of objectives?

    asked by me
  137. chemistry

    What is the molarity of H3O+ in a 4.97×10-2 M NH4Cl solution that hydrolyzes according to the equation. NH4+(aq) + H2O(l) = H3O+(aq) + NH3(aq)

    asked by uci student
  138. mgt

    what is evaluation by objectives?

    asked by me
  139. mgt

    what is evaluation by objectives?

    asked by me
  140. English

    Can you check once more how I paraphrased the beginning of the Canterbury Tales, please? Thank you in advance. 1) He describes rain as “sweet showers fall “ which “pierce the drought of March to the root”. Paraphrase: he describes the gentle spring

    asked by Franco
  141. Chemistry

    A potassium hydroxide solution has a pH of 12.90. Enough cid is added to react with half of the OH- ions present. What is the pH of the resulting solution? Assume that the products of the neutralization have no effect on pH and that the amount of

    asked by Alexa
  142. English 9 grade


    asked by marelyn
  143. mgt

    what is evaluation by objectives?

    asked by me
  144. mgt

    what is evaluation by objectives?

    asked by me
  145. MATH I

    x^2 + 5x +6/ x^2 - 3x -10 How do I do this? Is it asking me to divide? The answer choices are as following: A)x + 3/ x - 5 , x ≠ 5 B)x + 3/ x - 5 , x ≠ -2, 5 C)x2 + 5x + 6/ x - 5 , x ≠ 5 D)x2 + 5x + 6/ x - 5 , x ≠ -2, 5

    asked by Tallie
  146. mgt

    what is evaluation by objectives?

    asked by me
  147. English

    I forgot to include the following sentences. I hope you can have a look at them as well. 1)Chaucer describes his appearance and profession. The merchant is a representative of the new emerging middle class in English medieval society. 2) Chaucer also wants

    asked by Franco
  148. mgt

    what is evaluation by objectives?

    asked by me
  149. Grade 10 math

    Expand and simplify: -5(2x +5b)^2

    asked by raman
  150. 6th grade

    If today is Tuesday, what integer stands for last Sunday?

    asked by Erica
  151. Chemistry

    what pH values can be assigned to acids and bases respectively?

    asked by Alexa
  152. Chemistry

    What is the molar solubility of silver sulfide, Ag2S? (Ksp for Ag2S is 6.0 x 10^51.)

    asked by Dan
  153. economics

    an accurate statement about the great depresson is

    asked by gina
  154. Chemistry

    The S^2- ion is a relatively strong base with an equilibrium constant of 7.7x10^-1. What is the Ka value for HS- ? I got the equation HS^- H^+ + S^-2. Am I able to find [S^-2] with the Keq?

    asked by sh
  155. science

    What are the two processes that use oxygen?

    asked by tyson
  156. Chemistry

    Is 20.0 mL of 3.0 M HF a buffer solution with an approximate pH of 3?

    asked by Dan
  157. Math 9th grade

    x^2 + 5x +6/ x^2 - 3x -10 How do I do this? Is it asking me to divide? The answer choices are as following: A)x + 3/ x - 5 , x ≠ 5 B)x + 3/ x - 5 , x ≠ -2, 5 C)x2 + 5x + 6/ x - 5 , x ≠ 5 D)x2 + 5x + 6/ x - 5 , x ≠ -2, 5

    asked by Nat
  158. 6th grade

    how do you scale down 46x24 picture to fit 6x4 post card

    asked by Anonymous
  159. Science

    How is cell division responsible for growth. Could someone please tell me how it is responsible for growth clearly, thanks:-)

    asked by Sara
  160. science

    Why do animals ( in the water) (fresh) need plants??? Why is it important ?

    asked by Ashley
  161. Chem

    Write 2 separate balanced equations for the neutralization reactions of hydrochloric acid with sodium hydroxide and acetic acid with sodium hydroxide......i never get how to do that!

    asked by Alexa
  162. Science

    This question I posted yesterday as well, but received no help. There wasn't any info about it in my book, so I'm wonderig if you could help me with it. Why might scientists want to figure out a way to promote cell division in mature nerve cells?

    asked by Sara
  163. Chem

    How will you make a 200 mL solution of 1 mM sucrose from a 0.1 M sucrose solution? 1. Mix 20 mL of the 100 mM sucrose and 180 mL of water. 2. Mix 50 mL of the 100 mM sucrose and 150 mL of water. 3. Mix 1 mL of the 100 mM sucrose and 199 mL of water. 4. Mix

    asked by Roksana
  164. chemistry

    the specific heat of aluminum is 0.214 cal/g degrees C. calculate the heat necessary to raise the temperature of 55.5g of aluminum from 23 to 48.6 degrees C

    asked by Quentin
  165. Stats

    What is the probability that a simple random sample of 56 special orders will provide an estimate of the population proportion of special orders specifying the color black that is within plus or minus .05 of the actual population proportion,assuming p =

    asked by Anon
  166. chemistry

    calculate the amount of heat necessary ti raise the temperature of 8.5kg of water from 12.5 to 84 degrees C

    asked by Quentin
  167. Chemistry

    NaOH(aq) + HCl(aq)----> H20 + Nacl(aq).. solve for the amoont of energy aborbed by the solution. (50ml of 1.0M HCl is 23deg; 50ml of 1.0M NaOH is at 25deg; mixed solutuion= 31deg pls tell me the steps to take inorder to solve the question. Thanks in

    asked by Ade
  168. language arts

    Who was Shakespeare's most famous patron and what did Shakespeare write to honor this patron?

    asked by mic
  169. Chemistry

    Is 20.0 mL of 1.0M CH3COOH and 10.0mL of 1.0 M NaOH a buffer solution of 3?

    asked by Anne
  170. chemistry

    calculate the percent composition or w/v% of 3x10 to the 2nd power mL solution containing 15g of glucose

    asked by Quentin
  171. chemistry

    convert 353 torr to atm

    asked by Quentin
  172. chemistry

    calculate the pressure in atm of a balloon filled with 7.5g of helium gas if the baloons volume decreases to 7.5L suppose the balloons pressure and volume are originally 799 mmHg and 15L

    asked by Quentin
  173. Chem

    Compared with a pH of 7, a solution of pH 5 has what times/fraction of the hydrogen concentration? 1. 1/100 2. nearly the same concentration 3. twice 4.5/7 5. 100 times

    asked by Roksana
  174. biology

    Explain why a person should believe that all life that currently exists on planet earth evolved from a simple, common ancestor through the process of mutation, natural selection, sexual selection and genetic drift.

    asked by Terrance
  175. chemistry

    if 429 grams of gas occupies 25.6L at 49 degrees C at a pressure of 759 mmHg what volume will 4.29g of gas will occupy at 53 degrees C (assume pressure is unchanged)

    asked by Quentin
  176. chemistry

    calculate the number of moles there are when a gas occupies a volume of 3.95L at 37 degrees C and .985 atm

    asked by Quentin
  177. chemistry

    what is the density of O2 gas at STP

    asked by Quentin
  178. Chemistry

    What is the mass of NaOH required to prepare 100.0mL of NaOH(aq) that has a pH = 13.62 ? A. 0.38g B. 0.42g C. 1.67g D. 2.40x10^-14 g OH- + H2O H3O+ + O^-2 antilog-13.62 = 0.09976 #gNaOH=(0.1-0.09976)M x 40g/mol x 0.1L = 0.40g?

    asked by sh
  179. Chemistry

    0.1 mol NaCl + 0.1 mol KCl would produce a buffer solution if dissolved in water?

    asked by Michele
  180. English

    What are the important differences between telling a story as a novel or staging it as a play?

    asked by Sarah
  181. algebra

    what the heck is the answer! "whom should yo see at the bank if you need to borrow money?

    asked by sami blitzer
  182. L.A

    How should I begin my first paragraph when I'm trying to interpret a poem? The poem is Nothing Gold Can Stay by Robert Frost.Thanks

    asked by Shadow
  183. geometry

    the perimeter of a triangle is 59 inches. the longest side is 11 inches longer than the medium side, and the medium side is 3 inches more than the shortest side. Find the length of each side.

    asked by Jess
  184. Us constitution

    what the United States may have looked like had the Anti-Federalists "won" their points in the ratification debate and the writing of the Constitution

    asked by Nina
  185. Chemistry

    What is the pH of 50.0 M HF and 25.0mL of 1.0 M NaOH?

    asked by Chris
  186. Socials

    Why is there so much diversity in the interior plains region ?

    asked by Kaylee
  187. English

    If you were to adapt To Kill a Mockingbird to the stage a) what changes you make to the story? b) what events would you include? how would you stage them? c) what would you leave out? why?

    asked by Sarah
  188. Math

    I've been staring at this problem for an hour and have NO IDEA WHAT TO DO! "A quadratic function in the form f(x)=ax^2+bx+c contains the points (-1,0), (0,2), and (2,0)." a) determine the values of a,b, and, c b) Factorise the expression ax^2+bx+c obtained

    asked by David
  189. Chemistry

    Which of the following will increase the molar solubiity of Ag2CO3? (The Ksp for Ag2CO3 is 8.1 x 10^12.)

    asked by Jim
  190. Chemistry

    Sorry, I didn't finish the question: Which of the following will increase the molar sollubility of Ag2CO3? (The Ksp for Ag2CO3 is 8.1 x 10^12.) a. Add HCl b. Add AgNO3 c. Add NaCN d. a and c e. a, b, and c

    asked by Jim
  191. math


    asked by pavleen
  192. math


    asked by pavleen
  193. math


    asked by pavleen
  194. Chemistry

    Do strong and weak acids require equal numbers of drops of NaOH to neutralize? I THINK not....but i am not entirely sure......

    asked by Alexa
  195. math

    r|2=24 is it 48

    asked by pavleen
  196. trig

    find the primary solutions. 4cos^2x-3=0 and tanx-tan^2x=0.

    asked by Anonymous
  197. chemistry

    What is the concentration (in % mass) of a solution in which you dissolve 200 mg of NaHCO3 in 1.0 L of water?

    asked by Kiley
  198. Technology

    I'm writing an essay, and the first page is a cover page. Obviously, there shouldn't be a number there. How do I get rid of it so that there's still numbers on the other pages?

    asked by Andrew
  199. Math (logic)

    The first day you will earn 1/10 of a penny. The second day you earn twice as much (2/10 of a cent). The third day you earn double of what you earned the previous day. This payment pattern will continue for the month. What are some formulas I could use to

    asked by Ryan!
  200. 4th grade

    im upset with stressed syllables help

    asked by mary
  201. physics

    How long would it take a 1 200 W heater to melt 1.00 kg of ice at -12.0°C, assuming all the energy from the heater is absorbed by the ice? (Assume the specific heat of the ice is 2 090 J/kg · °C and the latent heat of fusion of water is 3.33 105 J/kg.)

    asked by olive
  202. Chemistry

    All of the following apply to the reaction A(g)+B(g)C(g) as it is carried out at constant temperature in a rigid container EXCEPT: A)The total pressure decreases B)The rate of reaction decreases C)The entropy of the system decreases D)The number of

    asked by Sean
  203. math

    y =13= 72/12

    asked by Anonymous
  204. math


    asked by pavleen
  205. P.O.B


    asked by j
  206. Chemistry

    For the burning of propane C3H8(g)+SO2(g)3CO2(g)+4H2O(g) which of the following is true at and temperature: i./\G0 iii./\H

    asked by Sean
  207. Math

    can you please help me with $6.30 x 8.5% thanks!

    asked by Erin
  208. Trigonometry

    Find all solutions for the following equation in the interval 0 ≤ x

    asked by richard
  209. statistics

    indicate whether the given statement could apply to a data set consisting of 1,000 values that are all different. a. the 29th percentile is greater than the 30th percentile. b. the median is greater than the quartile c. the third quartile is greater than

    asked by Brooke
  210. EA ICS course

    what is the optimum size for small groups? A) 3 B) 5 C) 8 D) 10

    asked by shay
  211. statistics

    a data set consists of a set of numerical values. which of the following is correct? a. there is no mode b. there are 2 modes c. there are 3 modes I answered a there is no mode is this correct?

    asked by Brooke
  212. Chem/Physics

    "your eyes receive a signal consisting of blue light, 470nm. The energy of the signal is 2.5*10^-14J. How many photons reach your eyes?"

    asked by Beno
  213. Physics

    A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 373 K. If 15.0 J of work is done by the gas during this process, what is the mass of helium present? I am not sure what equations to use for this problem....

    asked by Katy
  214. math

    help with making a frequency table and histogram using intervals of 25 meters for 20 of the tallest buildings.

    asked by martell
  215. trig1 more question

    it is always true that if -1 ≤ x ≤ 1 then cos(Arccos(x)) = x Give an example showing that Arccos(cos(x))= x need NOT be true for all x

    asked by richard
  216. Math

    Find the vertex, focus and directrix of the parabola. 4x - y^2 - 2y - 33 = 0 y^2+2y+1 = -4x+33+1 (y+1)^2 = -4(x+8.5) vertex:(-1,-8.5) focus:(-2,-8.5) Directrix: x=0 Is this correct?

    asked by Abbey
  217. Algebra

    what would be the approximation to the nearest ten-thousandth log 8900 over log 110?

    asked by dani
  218. Chemistry

    Water will react most completely as an acid with A. SO3^-2 B. H2BO3- C. C6H5O- D. CH3COO- Why isn't the answer A, since H2O + SO3^-2 HSO3- + OH- so H2O and HSO3- are the conjugate acids.

    asked by sh
  219. Science

    Could someone please have a moment to look at my science posts. I really need help on them. I'll appreciate all your help, thanks:-)

    asked by Sara
  220. 7th grade

    what is -4x=-76

    asked by tina
  221. 7th grade

    what is -4x=-76

    asked by tina
  222. science

    According to the condensation theory, the most important factor for the formation of our planets was _____.

    asked by Anonymous
  223. Algebra


    asked by ashley
  224. us history

    who helped to expand women's rights

    asked by beverly
  225. Math

    Find an equation of the parabola. vertex:(-1,2) focus:(-1,0) (x+1)^2 = 4p(y-2) (x+1)^2 = 0(y-2) (x+1)^2 = (y-2) Correct?

    asked by Abbey
  226. algebra

    beth is two years older than julio.Gerald is twice as old as beth.debra is twice as old as gerald.the sum of theIr ages is old is beth?

    asked by Anonymous
  227. Math

    Use a graphing utility to graph the function. Then use the trace or table feature to identify the limit. lim 5/x-2 x-->2 I know I posted this question before but I am still having a hard time doing this. I pressed the y= button and typed the normal

    asked by Abbey
  228. Science

    What mammal order has the dental formula 205/105?

    asked by Sean
  229. Pre-Calc

    Tee Ball is similar to baseball, but the field is a diamond 40 ft square. The pitchers mound is positioned 25 ft from homeplate. Determine the distance from the pitchers mound to 3rd base.

    asked by Kali
  230. CALC urgent please

    A boat crosses a river and arrives at a point on the opposite bank directly across from its starting position. The boat travels at 4 m/s and the current is 2m/s. If the river is 600 m wide in what direction must the boat steer and how long will it take to

    asked by Ariza
  231. Calculus

    A car is heading northwest at 80 km/h and a truck is heading east at 60km/h. Determine the velocity of the truck relative to the car.

    asked by Anonymous
  232. sentences

    whats a sentence for native?

    asked by priscilla Perez
  233. Spanish

    How would you write 750 AD and 500 BC in spanish? Would it be setecientos cincuenta despues de Cristo?

    asked by Anonymous
  234. chem

    How many moles of base are needed to neutralize 2 mol of acid for HNO3 + KOH - KNO3 + H2O?. Can u show your work please:) Thanks a bunch

    asked by Stacey
  235. us history

    what question was resolved with the great compromise?

    asked by rosie
  236. Is this algebra question right

    Do you rewrite the following as an equivalent logarithmic equation yt=x as E^2-2=7.3891?

    asked by dani
  237. Is this right

    I need to express as an equivalent expression that is a sum of logarithms. logt 13ab2 is this right (log+13t+loga+log+b+log+2)

    asked by dani
  238. grammar

    John has become a rather good actor.

    asked by tnik
  239. geometry

    A triangle's base is 14 inches less than 2 times its height. If h represents the height in inches, and the total area of the triangle is 54 square inches, which of the following equations can be used to determine the height?

    asked by Anonymous
  240. Precalculus

    Find the limit by direct substitution. A. lim x-> 5 square root cubed of x^2 -2x - 23. I replaced all of the x's with 5 and got -2. B. lim x-> -2 (4x^2 - 7x) / (6x + 10). I replaced all of the x's with -2 and got -15. Go to picturetrail and type in

    asked by Randy
  241. Math

    Use a graphing utility to graph the function. Then use the trace or table feature to identify the limit. lim 5/x-2 x-->2 I know I posted this question before but I am still having a hard time doing this. I pressed the y= button and typed the normal

    asked by Abbey(Please help)
  242. algebra

    -21+3z/2 divide 121z-847/4

    asked by jj
  243. Check Calculus

    What is the sum of 3 forces in equilibrium? Is it F3 = - (F1 + F2) or 0?

    asked by Ann
  244. Math

    A large tank contains 400-kg mixture of water and alcohol. The mixture is 64% alcohol by weight. At each step, 100 kg of the mixture will be drained from the tank, replaced with 100 kg of water and then stirred. After three steps, what percent of the final

    asked by Zach
  245. Check Calculus

    What is the sum of 3 forces in equilibrium? Is it F3 = - (F1 + F2) or 0?

    asked by Ann
  246. College Chemistry

    Sulfur trioxide is made from the reaction of sulfur dioxide and oxygen. how many grams of SO3 can be made from the reaction of 1.91g SO2 with 1.29g O2? 2 SO2(g) + O2(g)---> 2SO3(g) a) 2.39g b) 3.20g c) 3.23g d) 4.77g e) 6.46g How would i solve this

    asked by James