Questions Asked on
July 17, 2010

  1. chemistry

    Which of the following has the greatest buffer capacity? There are three separate problems below. 1. 0.40 M CH3COONa / 0.20 M CH3COOH 2. 0.40 M CH3COONa / 0.60 M CH3COOH 3. 0.30 M CH3COONa / 0.60 M CH3COOH Thanks!

    asked by George
  2. CHEMISTRY (WEBWORK)

    SPARTAN: Use the information from question #1 to answer the following. A. Which two orbitals from CV+ and –OH will overlap creating the C-O bond in CVOH? ______ (Use i, ii, iv, etc. for your answer) B. Which of the following accurately shows the orbital

    asked by june
  3. physics

    A car travels along a highway with a velocity of 24 m/s, west. The car exits the highway and 4.0 s later, its instantaneous velocity is 16 m/s, 45o north of west. What is the magnitude of the average acceleration of the car during the five-second interval?

    asked by axel
  4. Physics

    A .6-kg mass at the end of a spring vibrates 3.0 times per second with an amplitude of .13 m. Determine a.) the velocity when it passes the equilibrium point, b.) the velocity when it is .1 m from equilibrium. c.) the total energy of the system, and d.)

    asked by Stephanie
  5. Chemistry

    How would you solve this problem? C4H8(g)--> 2C2H4 Determine the order of the reaction and the rate constant based on the following pressures, which were recorded when the reaction was carried out 430 C in a constant volume vessel. Time (s) P(C4H8)(mmHg) 0

    asked by Jane
  6. chemistry

    A voltaic cell is contructed in which a copper wire is placed in a 1.0 M Cu(NO3)2 solution and a strip of gold i placed in a 1.0 M AuNO3 solution. The measured potential of the cell is found to be 1.36V and the copper electrode is negative. The Ered for

    asked by Mark
  7. chemistry8

    1.why must MgCl2.6H20 be added to the EDTA solution? 2. why should EDTA solution be stored to the polyethylene container? 3. why should HCl be added to calcium carbonate solution? 4. why is it necessary to buffer the solution at pH 10 during titration?

    asked by tan ni
  8. Calculus

    A 15 ft ladder is leaning against a wall.If the top of the ladder slips down the wall at a rate of 5ft/s, how fast will the foot be moving away from the wall when the top is 9ft above the ground.

    asked by Kelly
  9. analytical chemistry

    why is it necessary to use previously boiled and cooled distilled water in the dilution of your unknown carbonate mixture? can methyl orange be used as indicator if only NaOH is present in the sample?

    asked by tan ni
  10. College physics

    Find the following currents. The current I_1 through the resistor of resistance R1 = 15.0 Ohm * The current I2 through the resistor of resistance R2 = 45.0 ohm. * The current I3 through the resistor of resistance R3 = 20.0 Ohm. * The current I4 through the

    asked by monique
  11. Physics-Gravity

    A orbiting satellite stays over a certain spot on the equator of (rotating) Pluto. What is the altitude of the orbit (called a "synchronous orbit")? Do I use T^2=4pi^2/GM x r^3?

    asked by Anna
  12. Chem

    Variation of the rate constant with temperature for the first-order reaction 2N2O5(g)  2N2O5(g) + O2(g) Is given in the following table. Determine graphically the activation energy for the reaction. T(K) k(s^-1) 2981.74 x 10^-5 308 6.61 x 10^-5 318 2.51

    asked by Paul
  13. chemistry (WEBWORK)

    Use the labels (CV+, –OH, CVOH, , Ea (activation energy), & G) to complete the reaction potential energy profile below. More than one answer is possible for some spots. a. (Use i, ii, iv, etc. for your answer) b. (Use i, ii, iv, etc. for your answer) c.

    asked by june
  14. chemistry

    The following reaction was monitored as a function of time: AB--->A +B A plot of 1/[AB] versus time yields a straight line with slope 5.2 x 10^-2 M*s. What is the value of the rate constant (k) for this reaction at this temperature?

    asked by Ellen
  15. Math 11u

    A town has a population of 8400 in 1990. Fifteen years later, it's population grew to 125,000. Determine the average annual growth rate of this town's population. Round to the nearest tenth of a percent.

    asked by Kerry
  16. Chemsitry

    I don’t understand how to write this equation. Write an equation relating the concentration for a reactant A at t=0 to that at t=t for a first-order reaction. Define all the terms, and give their units. Do the same for a second- order reaction. -Would it

    asked by Jane
  17. College physics

    Find the following potential differences. The magnitude of the potential difference DeltaV1 across the resistor of resistance R1 = 15.0 Ohm. The magnitude of the potential difference DeltaV2 across the resistor of resistance R2 = 45.0 Ohm. The magnitude of

    asked by monique
  18. Pre-Cal

    A person flying a kite holds the string 4 feet above ground level. The string of the kite is taut and makes an angle of 60 degrees with the horizontal. Approximate the height of the kite above level ground if 500 feet of string is payed out.

    asked by Aaron
  19. Physics

    What net braking force must be applied to stop a car with a mass of 900 kg initially travelling at a velocity of 100 km/h within a straight-line distance of 50 m?

    asked by Syafiqa
  20. Calculus

    Both x and y denote functions of t that are related by the given equation. Use this equation and the given derivative information to find the specified derivative. Equation:35x^2+20y^2=1 Given that dx/dt=4, find dy/dt when (x,y)=(1/7sqrt2, 1/5sqrt2)

    asked by Kelly
  21. Math 11u

    A Computer company has been selling 1200 computer games per week at $18 each. Data indicates that for each $1 price increases, there will be a loss of 40 sales per week. It costs $10 to produce each game. Let x represent the number of $1 price increases.

    asked by Kerry
  22. Grammar

    Are the appositives essential or non essential? 1. My son, the policeman, will be visiting us next week. 2. The captain ordered the ship's carpenters to assemble the shallop, a large rowboat. 3. Walter, the playboy and writer, is very attached to his

    asked by Leslie
  23. Physics

    A rope that is at 35° to the horizontal is used to pull 10kg crate across a rough floor. The crate is initially at rest and is dragged for a distance of 4.0m. The tension in the rope is 60N and the frictional force opposing the motion is 10N. A) Calculate

    asked by Syafiqa
  24. College physics

    What is the potential difference across the 10 and 20 ohm resistor in the figure there is a battery of 15V with two in series resistors of 10 Ohm and 20 ohm

    asked by emoni
  25. accounting

    You have been assigned the task of testing the accuracy of the final inventory compilation for Mt. Hood Furniture. You may assume that you have separately observed the inventory and that you are satisfied that the inventory was accurately counted. However,

    asked by renegade
  26. Chemistry

    I am having figuring out the Lewis Dot Structure of ICl2-? Can anyone help???

    asked by Kara
  27. psychology

    Social learning theory emphasize that: A: observation and imitation play crucial role in the gender -typing process. B: children only learn gender -typed behaviours if they have been directly rewarded for them. C: children will not learn gender-typed

    asked by rally
  28. Physics

    "Two masses, 2000kg and 5000kg, are placed 20m apart. A third mass of 5000kg is placed in between the two large masses a distance of 5.0m from the larger mass. What is the force acting on the 500kg mass?"

    asked by Stuck
  29. Chemistry

    A reaction is first order and it takes 324 minutes for the reaction to be 50.0% complete. How long will it take for the reaction to be 85.0% complete at the same temperature? 2. N2O5 decomposes to N2O4 and O2 and the reaction is first order in N2O5 with a

    asked by Lin
  30. Chem

    how many molecules of water are produced from 2.0 x 10^23 molecules of oxygen? how many moles of water are produced from 22.5 moles of oxygen?

    asked by Gregg
  31. statistics

    1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence

    asked by Anonymous
  32. psychology

    Kayla is curious about objects and activities, like climbing walls, drinking at a fountain, and playing at the park. However, Kayla’s mother hovers over her, clearly worried about her safety and restricting her exploration and play. According to Erikson,

    asked by Tami
  33. Inorganic Quantitative Analysis

    What is a double indicator titration?

    asked by Gill
  34. PSYCHOLOGY

    “There are many social and cultural contexts you interact with that strongly influence development. These contexts include people you interact with daily, neighborhood factors, and larger scale social and cultural variables. In order to fully understand

    asked by Tami
  35. college

    Do students at various universities differ in how sociable they are? Twenty-five students were randomly selected from each of three universities in a region and were asked to report on the amount of time they spent socializing each day with their students.

    asked by Karen Johnson
  36. statistics

    A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence

    asked by Anonymous
  37. us history

    after the war of 1812, What were the negative aspects of the new market economy? What were the positive aspects of the new market economy? How did the creation of a single market economy shape American values and the economy of today?

    asked by karen
  38. world religions

    I am conducting a research paper and am having trouble finding comparisons and contrasts between Judaism and Buddhism with credital authors, where could I go to find this information?

    asked by Nancy
  39. geometry

    How much foil is required to cover a rectangular box that is 4in. by 8in. by 5in.? use 3.14 as an aproximation for pi. where appropriate.

    asked by DJ
  40. College physics

    How much work is done to move 1.8C of charge from the negative terminal to the positive terminal of a 1.5V battery?

    asked by emoni
  41. Chemistry

    If a diagram describes an initial state of the reaction A2 + B2 --> 2AB. Would the picture with more AB products represent the result at the higher temperature?

    asked by Jane
  42. algebra

    can any one show me where to get free online help with algebra? i need a tutor or someone to show me what im doing

    asked by bobbi
  43. Communication and Gender Studies

    Why is it that the most effective way to humiliate a man is to make him look or act like a woman, or accuse him of looking or acting like a woman?! Does the reverse hold true? Would it be demeaning for a woman to act as a man?

    asked by Audrey
  44. algebra

    this is what they want and im confused can any one explain it Rewrite the following in simplified radical form. Assume that all variables represent positive real numbers

    asked by bobbi
  45. HHS 225

    I am supposed to write a vulnerability report for an urban medical clinic serving low-income clientele. The clinic is located in a hot, dry desert region of Southern California, in high-traffic, high-crime area; Where do i begin??????

    asked by Stacy
  46. health

    had 20 postoperative deaths.The posteperative dealth rate are calculated by patients who expired in what period of time?

    asked by Sashy
  47. Physics

    A) Calculate the kinetic energy of a 5.0g bullet travelling with a velocity of 400^ms-1. B) Calculate the gravitational potential energy relative to the ground when a bird of mass 105g is 400m above the ground.

    asked by Syafiqa
  48. algebra

    uh i have a problem that has a square root sign 54w then a 6 as a exponet can anyone help me?

    asked by bobbi
  49. Calculus

    Find f'(x) when f(x)=sin(1/x^3)

    asked by Kelly
  50. Physics-Gravity

    A 17.0-kg satellite has a circular orbit with a period of 2.31 h and a radius of 9.10×106 m around a planet of unknown mass. If the magnitude of the gravitational acceleration on the surface of the planet is 8.10 m/s2, what is the radius of the planet?

    asked by Anna
  51. math

    a. Suppose a market research company finds that at a price of p = $20, they would sell x = 42 tiles each month. If they lower the price to p = $10, then more people would purchase the tile, and they can expect to sell x = 52 tiles in a month’s time. Find

    asked by Danie
  52. Math 11u

    There are two values for "a" and "b", if any, that would make (-4)^a(divided by)b Undifined? Explain reasoning.

    asked by Kerry
  53. economics

    explain how the strength of the economy could affect the marginal benefits and the marginal costs associated with a decision to purchase a home.

    asked by Mike J
  54. College physics

    A toy car has a mass of 120g, including two 1.5 V batteries connected in series. Suppose the motor that drives the car is 80\% efficient (i.e., 80\% of the electric energy goes to the drive wheels, 20\% is dissipated as heat) and that friction and air

    asked by katie
  55. med. terminology

    should written policies be developed for abbreviation usage, if yes, what should policy contain?

    asked by kacey
  56. algebra 2

    I am down to three I can not figure out, help please. subtract (2x^4 + 9x^3 -1) - (9x^2 -2x +4)=

    asked by Christy
  57. child care

    1.When properly executed, the behavior management strategy known as time-out becomes(a) A. a positive reinforcer. B. more effective than logical consequences. C. a conversation between child and adult. D. suitable punishment for misbehavior. 2. Which of

    asked by Ms.Dionn
  58. geometry

    Use a two column proof to show that the centroid of an equilateral triangle divides the inside area into 6 congruent triangles

    asked by Florida
  59. Humanities

    Compare and contrast the Greek and Roman civilizations in terms of cultural and artistic achievements, political and legal innovations, social and economic programs, philosophical, literary and intellectual enrichment, and constructive infrastructure.

    asked by Sheila
  60. us history

    In what ways did democracy create a new political culture? How did democracy impact social change?

    asked by karen
  61. physics

    please differentiate between vibration, amplitude and frequency by giving relevant examples. I cant understand these concepts. I would be very grateful if they explained

    asked by Ramesh Reddy
  62. chemistry

    Calculate the energy released when 200 g of ethanol are cooled from 30.0 oC to 5.00 oCeased when

    asked by Anonymous
  63. law

    i need a contract agreement between me and verizon as an agent. can you please help me?

    asked by ayaz
  64. Algebra 2

    how do I find the length and width of a rectangle when the width of the rectangle is 3 feet less tahn the length. The area is 18ft^2

    asked by Kate
  65. corporate finance

    Marigold Products is expected to pay a dividend of $1.98 one year from today. If the firm’s growth in dividends is expected to remain at a flat 4 percent forever, what is the cost of equity capital for Marigold if the price of its common shares is

    asked by Bjusreal
  66. corporate finance

    Life Balance, Inc. has found that its cost of common equity capital is 15 percent and its cost of debt capital is 9 percent. If the firm is financed with $6 million of common shares (market value) and $4 million of debt, what is the after tax weighted

    asked by Bjusreal
  67. MATH

    This is the second of three I can not figure out, help please. Divide x^2 + 4x -28 / x + 7

    asked by Christy
  68. math

    this is the third and final problem I can not figure out. Help please Divide (x^4 - 8x^2 + 15) / (x^2 -3) =

    asked by Christy
  69. Mat117

    a. Suppose a market research company finds that at a price of p = $20, they would sell x = 42 tiles each month. If they lower the price to p = $10, then more people would purchase the tile, and they can expect to sell x = 52 tiles in a month’s time. Find

    asked by Danie
  70. english

    I have to write a 1000 essay in which I must connect two books together. Yann Martel's "Life of Pi" and Tim O'Briens "The Things They Carried" The thing is, I have no idea where to even start. Any ideas for premises, thesis statement etc.?

    asked by Mr. man
  71. quantitative inorganic analysis

    1.suggest another liquid aside from nitrobenzene that would serve to prevent the dissociation of AgCl on addition of KSCN. 2.is it necessary to add nitrobenzene when the analyte is Br^-1 or I^-1? explain

    asked by tifany
  72. Algebra

    4x^4-13x^2+9=0 2x-square root of x-1=0 3/x+4/(x+1)=2

    asked by Alicia
  73. Macroeconmics

    Do you believe the economy is more prone to correcting an inflationary gap or a recessionary gap, and why?

    asked by Valarie
  74. Math

    how to factor this equation algebraically? 2a^2-84a+70 Thank you for helping me and any help given will be greatly appreciated. And to solve this you probably have to use the factor theorem.

    asked by Jessica
  75. multi

    microsoft publisher 2010 product key

    asked by office
  76. health

    What the correct denominator for calculating the cesarean section rate?

    asked by Sashy
  77. information strategies

    i need help with appendix D of week 6 can someone help me

    asked by UOPstudent 05
  78. health

    hospital cenus on jan.4 is 110. folling data, what is the hospital cenus for ja.5?

    asked by Sashy