Questions Asked on
June 19, 2010

  1. chemistry

    Convert 3.01 x 1023 molecules of C2H6 to moles.

    asked by HELP!!!
  2. physics

    A thin 2 kg box rests on a 6 kg board that hangs over the table. the length of the board on the table is 30 cm and the length of the board hanging off the table is 20 cm. How far can the center of the box be from the end of the table before the board

    asked by Anonymous
  3. chemistry

    How many atoms does 2.0 moles of He represent?

    asked by HELP!!!
  4. chemistry

    How many grams of NaCl will be produced when 22.85 g of HCl are neutralized by an excess of NaOH according to the equation below? HCl + NaOH ¨ H2O + NaCl

    asked by andrea.
  5. Geography

    A circulating current of warmer material(such as magma) P.S It is 2 words and they are _ _ _ _ _ _ _ _ _ _ / _ _ _ _ _ _ _

    asked by Alex
  6. Chemistry

    Air entering the lungs ends up in tiny sacs called alveoli. It is from the alveoli that oxygen diffuses into the blood. The average voume of the alveoli is .00000000078 L. Assuming that the pressure in the alveoli is 1.0 atm and the temperature is 37

    asked by Anonymous
  7. chemistry

    Nitrogen monoxide reacts with oxygen according to the equation below.. 2NO + O2 -----> 2NO2... How many moles of NO are required to produce 5.0 moles of NO2 in excess oxygen?

    asked by Monica
  8. Chemistry

    Determine the molar mass of a gas with a density of 1.3786 g/L at 80.00 degress celsius and exactly 1 atm.

    asked by Jo-ann
  9. Calculus - URGENT EXAM

    I HAVE AN EXAM REVIEW QUESTION AND I REALLY NEED HELP. An airplane has an air speed of 330km/h and is heading in a direction of N30E when it encounters a wind from the north. The resultant ground velocity has a direction of N40E. How long does it take for

    asked by Santha
  10. chemistry

    pls explain your answer Which of the following solutions would be expected to be the best conductor of an electric current at room temperature? a. 1.0 M CH3COOH b. 0.10 M CH3COOH c. 0.10 M CO(NH2)2 d. 0.10 M Na2SO4 e. 0.10 M NaCl thanks

    asked by Mohamad
  11. chemistry

    How many grams of aluminum would react completely with 17.50 grams of copper (II) chloride according to the following equation? Al(s) + CuCl2(aq) ---> AlCl3(aq) + Cu(s

    asked by andrea.
  12. Maths

    A square has an area of S^2 and a regular hexagon has a perimeter of T. If p is the perimeter of the square and h is a side of the hexagon, then find h+p in terms of S and T.

    asked by Mark
  13. chem

    sorry . Can you please help me with this questions If you know? Oxalic acid is a relatively strong diprotic acid with Ka1 = 5.6 ´ 10-2 and Ka2 = 5.1 ´ 10-5. What is the C2O42- concentration in a solution that is 0.10 M in oxalic acid and 1.0 M in HCl?

    asked by khin
  14. math

    A test is composed of six multiple choice questions where each question has 4 choices. If the answer choices for each question are equally likely, find the probability of answering 3 OR 4 questions correctly. 0.131836 0.032959 0.004639 0.164795

    asked by molly
  15. math

    A certain aircraft can fly 768 miles with the wind in 4 hours and travel the same distance against the wind in 6 hours. what is the speed of the wind?

    asked by Anonymous
  16. Calculus

    A travel agency currently has 80plp signed up a tour. The price of a ticket is $5000 per person. The agency has chatered a plane seating 150 plp at a cost of $250000. Additional costs to the agency are incidental fees of $300 per person. For each $30 that

    asked by Adeola
  17. chemistry

    what is the oxidizing agent in the equation 8H(aq)+ 6Cl(aq)+ Sn(s)+ 4NO3(aq)yields SnCl6(aq)+ 4NO2(g)+ 4H2O

    asked by Ellie
  18. Math

    The cost C, in dollars, to produce graphing calculators is given by the function C(x)=57+4500, where x is the number of calculators produced. How many calculators can be produced if the cost is limited to $129,900?

    asked by Anonymous
  19. physics

    Two masses are hanging over a frictionless, massless pulley as shown blocks_pulley_aMass m1 is 5.0 kg and mass m2 is 7.0 kg

    asked by bill
  20. science

    the atomic mass of N is 14 u and that of Ca is 40 u. the proportion of n by mass in the compound Ca3N2 is what?

    asked by Frank
  21. chem

    A solution that is formed by combining 600. mL of 0.20 M NaOH with 400. mL of 0.40 M HNO3 has an H+ concentration of

    asked by leona
  22. chemistry

    How many grams of potassium nitrate are required to produce 5.00 g of potassium nitrite according to the equation below? 2KNO3(s) ---> 2KNO2(s) + O2(g)

    asked by andrea.
  23. Calculus

    When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation PV^{1.4}=C where C is a constant. Suppose that at a certain instant the volume is 530 cubic centimeters and the pressure is 97 kPa and

    asked by Thomas
  24. chemistry

    How many moles are represented by 16.0g of ethanol, C2H5OH?

    asked by kourtney
  25. Thermochemistry

    A 1.00-g sample of solid calcium was burned in fluorine to give a 1.95 g sample of pure CaF2. The energy given off in this reaction was 30.3 kJ. Given this information, we can say that the heat of formation of 1 mol of CaF2 is

    asked by joan
  26. Hayden

    Chloroacetic acid has a relatively large equilibrium constant, so at low acid concentrations it is necessary to use the quadratic equation in order to calculate the concentrations of the aqueous species. Ka for ClCH2COOH is 1.4 ´ 10-3. For the problems

    asked by leona
  27. English

    1. Bob is 4 cm shorter than Emily. 2. Mr. Pitt is 16 kg heavier than Emily. 3. Emily is 1 year younger than Bob. 4. Bob weighs 4kg more than Emily. (Are the expressions correct grammatically?)

    asked by rfvv
  28. Maths 3u trig

    If sinA = 1/3 and cosA

    asked by Jenny
  29. Chemistry

    A precipitate will be formed when an aqueous carbonic acid soution is added to what other aqueous solution? A. ammonium chloride B. calcium hydroxide C. Sodium Chloride D. Potassium carbonate E. Nitrous acid

    asked by Ellie
  30. geometry

    A spherical water tank has a diameter of 10 feet. How much water does it hold when half full (use 3.14 for , and round to the nearest hundredth)?

    asked by dan
  31. chemistry

    calculate the density of helium in a helium balloon at 21.7 degress celsius. (Assume that the pressure inside the balloon is 1.15 atm.)

    asked by Jo-ann
  32. trig

    Solve for [0, 360) 2sinxcosx + cosx =0 2sinxcosx = -cosx 2sinx = -cosx/cosx sinx = -1/2 {210, 330) Is this correct?

    asked by Sara
  33. Chemistry

    what is the net ionic equation for NaOH + H2SeO3?

    asked by Ellie
  34. math

    The cost in millions of dollars, to remove x%of pollution in a lake is mideled by C=6.000/200-2x. A.) What is the cost to remove 80% of the pollutant? Remember that the cost is in millions of dollars. B.) For what value is the equation undefined? What does

    asked by Taylor
  35. chem101

    A 7.2 ´ 10-3 M solution of acetic acid is 5.0% dissociated. In a 7.2 ´ 10-4 M solution, the percentage of dissociation would be Value A. The same. B. >5%. C.

    asked by shahd
  36. Algebra

    Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Transform the second expression into the equivalent logarithmic equation; and evaluate the logarithmic equation for three values of x that are greater

    asked by Sol
  37. chemistry

    what is the volume of 4.37 moles of an ideal gas at 26.5 degrees celsius and 1.00 atm?

    asked by Amanda
  38. Business Negotiations

    What are the five types of power? I don't know what the five types are and everytime zi search there is something different per, doctorol, attorney, etc... this is 5 types of power in business or negotiations. Based on your experience with a negotiation,

    asked by BC
  39. Marketing

    The ____ area of the marketing mix is concerned with decisions about getting the right product to the target market when and where it is wanted. a)People b) product c) place d) promotion

    asked by Pam
  40. Algebra

    16. Going into his final exam, John has a total of 72 points out of 90 possible in his history class. His final exam is worth 10 points. How many points must he get on his final exam to end the class with an 80%? 8? 17. Joan actually likes 30% of her male

    asked by mysterychicken
  41. maths - trigonometry

    I've asked about this same question before, and someone gave me the way to finish, which I understand to some extent. I need help figuring out what they did in the second step though. How they got to the third step from the second. [sinx + tanx]/[cosx + 1]

    asked by anonymous
  42. chemistry

    How many total atoms are in 1.0 moles of H2O ?

    asked by HELP!!!
  43. Teaching as a Profession

    • Write a 200- to 300- word paper in which you list 3 to 5 factors that define teaching as a professional career. Elaborate on how these factors are employed by teachers on a daily basis. Here is what I have thus far. i was having trouble elaborating on

    asked by Anonymous
  44. science

    balance any 25 chemical equation and write the name of the reactant and the product. mention the catalist when ever required.

    asked by priya
  45. soc120

    which agents of socialization are most important at certain stages of human development? for example, discuss how the family is important to moral development or how peer groups are important to personality development .

    asked by bud
  46. Calculus

    If f(x) = 4ln(5 x+ 4ln(x)), find f'( x ).

    asked by Jason
  47. college

    You're thinking of investing in a automation project to reduce cost of production. -Investment in Fixed Assets: $900,000 at t=0; salvage value of $300,000 at t=6; straight line deprectiation over 6 years (assume book value is 0 at t=6) -Investement in NWC:

    asked by Dan
  48. Algebra

    Totally lost here! Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Transform the second expression into the equivalent logarithmic equation; and evaluate the logarithmic equation for three values of

    asked by Ally
  49. Chem

    mass of empty cylinder is 87.470g 97.470g w/10mL of water 107.470g + 10mL of water 117.470g + 10 more mL of water need to know the total volume of water (in mL or cm3) total mass of water density of water calculate the average of the 3 densities of water.

    asked by dra
  50. math

    The cost in millions of dollars, to remove x%of pollution in a lake is mideled by C=6.000/200-2x. A.) What is the cost to remove 80% of the pollutant? Remember that the cost is in millions of dollars. B.) For what value is the equation undefined? What does

    asked by Taylor
  51. engineering

    why exponential model may be better choice for modelling data than the linear model.

    asked by Candy
  52. physics

    a car of height H could negotiate a bend on a banked road of certain degree and of radius r with a maximum speed. is it possible for a truck of height 3H to negotiate that same bend with same speed at that same angle.show proof to back the condition

    asked by sandra
  53. Chem

    Using this formula.. pH = -log(H^+) find the pH 1.6 x 10^(-5)

    asked by Zen
  54. soc120

    • Due Day 4 (Thursday): Choose a family member or someone you know well who has experienced most adult life stages, such as a parent, grandparent, or an older brother or sister. Describe examples of how socialization occurred at different stages of this

    asked by bud
  55. math

    Can you give me step by step instruction on how to solve this problem Helium is pumped into a spherical balloon at a constant rate of 4cubic feet per second. How fast is the radius increasing after 3 minutes? At what time (if any) is the radius increasing

    asked by Artis
  56. Economics

    which country would rank as the best place to raise a child. Be sure to include comparisons such as Literacy rates, infant mortality rates, and any other comparison of a country that you feel might be important to your child.

    asked by Kim
  57. math

    How long is the side of a square picture that can fit inside a circular picture frame that has a diameter of 8 inches? Hint: Pythagorean Theorem

    asked by jr
  58. algebra

    4(2x+y)-3(x-5)

    asked by Rose
  59. chemistry

    with would be more convenient? (A) burn 1 mole of carbon with 2 moles of sulfur and mesure the energy yield (B) burn 602,000,000,000,000,000,000,000 atoms of carbon with 1,204,000,,000,000,000,000,000,000 atoms of sulfur and measure the energy yield.

    asked by eriika
  60. Religion

    I have read the chapter on Hinduism, in a book called Living Religion by Mary Fisher, but I am having difficulty finding the answer to the following question: What are the cultural and societal influences that have made Hinduism vital to the region in

    asked by Tonni
  61. chemistry

    How many moles of oxygen gas (O2) are in 448L at STP (273K and 1 atm of pressure)?

    asked by kim.
  62. chemistry

    Find the molar mass of Hg2Cl2

    asked by ninki
  63. effective essay writing

    Post your response to the following: Select one of the essays from the Examples of Effective Conclusions section in Effective Introductions and Conclusions. Which article did you choose? What kind of conclusion does the writer use? What is the impact of

    asked by Anonymous
  64. Biology

    Consider the following events: 1) The protein has sugar added to become a glycoprotein. 2) The protein is in the plasma membrane with the sugar modification facing outside the cell. 3) A membrane protein is synthesized in the rough endoplasmic reticulum.

    asked by Patrice
  65. Government/Economics

    Which of the following statements is incorrect? a.)Early representative parliaments were elected by the people. b.)The development of representative parliaments helped establish the principle of consent of the governed. c.)Representation is a crucial

    asked by Ariel
  66. English

    I am an English learner and I have a hard time in understanding the below sentences. "It's a dead issue. These days you can hardly get people to read about a live issue. People are issued out." dead issue= people stop talking about it? And what does "issue

    asked by Anonymous
  67. computers

    How do you think a presenter can find balance in providing information and using the PowerPoint as a "tool" to keep the audience's attention?

    asked by terry
  68. chemistry

    I know the answers for these questions, I just want to learn why 1- Use the table to determine which of the following species will convert Cd2+ to Cd. A. Fe3+ B. Pb2+ C. Zn D. Co2+ E. Sn 2- Which of the following salts will form an acidic aqueous solution?

    asked by zidan
  69. computers

    Hello everyone I have this homework about protection programs can you tell me wat these r. plz The Data protection act The Computer missuse act and one more which iv'e forgotten Can you tell me what that missing one is or wat those acts are all about.

    asked by Alex
  70. GCSE geography

    Examples of how has technology aided the spread of globalisation. thankyou

    asked by dancer
  71. Algebra

    Evaluate the logarithmic function for three values of x between zero and one, three values of x greater than 1, and at x=1. Show your work. Use the resulting ordered pairs to plot the graph. State the domain and the range of the function. g(x) = ln x + 2

    asked by Zen
  72. Algebra

    Can anyone tell me if this answer is correct? Solve the problem. Let's imagine that in 2001, a surgeon performs the first brain transplant, the only transplant performed that year. If in 2010, there are 983 brain transplants, find an exponential growth

    asked by Xan
  73. english

    can anyone tell me the indivituality displayed by othello in the play by shakespeare?

    asked by ray
  74. health care

    Develop a unique proposal that describes a new health care system. Consider the current U.S. health care system’s strengths, weaknesses and challenges.

    asked by jonny
  75. chemistry

    If you have a mole of eggs, how many eggs do you have?

    asked by eriika
  76. chemistry

    How many moles of NaCl are in 16.0 grams of NaCl?

    asked by kourtney
  77. Chemistry

    Under constamt-pressure conditions a sample of hydrogen gas initially at 93 degress celcius and 8.1 L is cooled until its final volume is 1.7 L. What is the final temperature?

    asked by Amanda
  78. Equation

    -4x (little 2) =0 Not sure what name the technique means. I know this is a Quadratic Equation.

    asked by Lisa
  79. college biology

    Consider the following events: 1) The protein has sugar added to become a glycoprotein. 2) The protein is in the plasma membrane with the sugar modification facing outside the cell. 3) A membrane protein is synthesized in the rough endoplasmic reticulum.

    asked by Patrice
  80. psyhology

    identify the relation of psyhology to other science

    asked by Anonymous
  81. Music

    Which one of the following is characteristic of Brahms's compositions? A. Hollow sounds and dissonant melodies B. Well-organized and well-developed themes C. Feeling of self-pity and despair D. Radical innovations i think the answer is (B) or (D)im leaning

    asked by Ringa
  82. Math help

    what does a and b represent in linear regression Y=aX+b.

    asked by Tim
  83. Math help

    Hi again how can i get the growth factor by using exponential regression from the function Y = a(b^x) and i have calculated the value of a and b.

    asked by Tim
  84. Geography

    What do the crust and upper mantle form?

    asked by Alex
  85. Geography

    A type of Wave P.S It's _ _ _ _ _ _ _ and it's not tsunami

    asked by Alex
  86. chemistry

    What is the concentration of the propionate ion at the equivalence point?

    asked by random
  87. Communication and Gender Studies

    What are some male stereotypes and the role language had in shaping these stereotypes?

    asked by Audrey
  88. gcse science

    how would you get iron from iron oxide?

    asked by harry
  89. Algebra

    Need help with this: 39. Money in a bank account that compounds interest by some percentage acts _____ a. linearly b. exponentially c. negatively d. like a fraction I'm stuck between A or B... Thanks -MC

    asked by mysterychicken
  90. Algebra

    How to solve for 3n = 5 ? I know it has to do with log, but I'm not sure how to find the answer. Thank you so much in advance ^-^

    asked by Lynn
  91. College Math

    I have been struggling with this problem I cannot get the right answer. Please give me the steps to solve this problem. Let f(x)= (2x-9)(x^2 + 6) (A) Find the equation of the line tangent to the graph of f(x) at x=3 (B) Find the values(s) of x where the

    asked by Ronnie
  92. english

    What journey did othello go through both physical and emotional in the play ?

    asked by marina
  93. English

    If anyone has read the novel the power of one can you tell me the individuality peekay displayed in the novel?

    asked by marina
  94. physics

    An object is thrown down with a speed of 80 m/s. What is its speed 2 s later?

    asked by Brittani
  95. english

    select the sentence in which the verb correctly agrees with the subject.

    asked by Laurie
  96. math

    The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 45 years of experience. Round to the

    asked by molly
  97. medical billing and coding

    how will employees in the medical office have to be trained regarding privacy

    asked by soad
  98. Math

    -^4sqr1296

    asked by Anonymous
  99. chemistry

    4. If you have a mole of copper atoms, how many copper atoms do you have?

    asked by eriika
  100. chemistry

    calculate the number of atoms of C of 25.0g C?

    asked by ana
  101. chemistry

    Find the molar mass of AlCl3

    asked by kim.
  102. chemistry

    Find the molar mass of Na2Al2(SO4)4

    asked by ninki
  103. Chem

    how do you find the total volume of water total mass of water and density of water?

    asked by dra
  104. chemistry

    how di i use PV=nRT for: How many moles of oxygen gas (O2) are in 448L at STP (273K and 1 atm of pressure)? need help!

    asked by kim.
  105. algebra

    (ab)¯³ a-³ x b-³ = 1/a³ x 1/b³= 1/a^2b^2 why is the exponent changed to 2 and does not remain 3? Thanks

    asked by Chrysanne
  106. Algabra

    I need to know step by step how to complete the square to this problem: x^2-12x

    asked by Marlo
  107. Scientology

    Does anyone know anything or have an opinion on Scientology (religion) I have chosen this as my final topic it is 2500 words and I only have 1500 I have been to the sites, I have done the research, but I have yet to ask people what they think or know of

    asked by BC
  108. Chemestry

    What is the pH? 1.6 x 10^(-5)?

    asked by Kate