Questions Asked on
July 19, 2014

  1. chemistry

    1. Calculate the standard enthalpy change for the reaction: C2H4(g) + H2(g) → C2H6(g) given that the enthalpy of combustion for the reactants and products are: ΔHºc(C2H4)(g) = -1411 kJ mol^-1 ΔHºc(C2H6)(g) = -1560 kJ mol^-1 ΔHºc(H2)(g) = -286 kJ

    asked by John
  2. History

    In Uncle Tom's Cabin, (the book) did blacks have a racial caste system? Please explain

    asked by Natalie
  3. Coding

    Anesthesia services for closed treatment of fracture of humerus; patient is 85 years old, but healthy. Provide the code(s) and the physical status modifier.

    asked by Rikima
  4. math

    5. The sum of 7 unequal positive integers is 61. What is the largest possible value that any of those integers can have? A.55 B.40 C.39 D.13 E.9 please show work

    asked by Johnny
  5. Psychology

    analyze the function of emotions as motive.

    asked by Mandy
  6. math

    The sum of the first n odd number is n^2. The sum of the first 30 odd numbers is A. 60 B. 90 C. 300 D. 900 Thank you for the help in advance =)

    asked by Jena
  7. math

    Rico works for a landscaping company. He will enclose a square garden, using a full 50 ft roll of wire fencing. What could the largest dimension of the garden be? Sketch and label the garden, then calculate perimeter to verify your answer.

    asked by Johnny
  8. chemistry

    2. Calculate the enthalpy change of combustion for ethene gas (C2H4) given the following enthalpy changes of formation: ΔHºf(C2H4)(g) = +52 kJ mol^-1 ΔHºf(CO2)(g) = -394 kJ mol^-1 ΔHºf(H2O)(g) = -286 kJ mol^-1

    asked by John
  9. chemistry

    4. Calculate the Gibbs’ free energy change for the reaction Mg(s) + H2O(g) → MgO(s) + H2(g) carried out at 100ºC given the data below. Under these conditions is this reaction product favoured? ΔHºformation (kJ mol^-1) MgO(g) -602 H2O(g) -242 H2(g) 0

    asked by John
  10. chemistry

    Which of the following is the ph of a solution in which concentration of hydrogen ion is greater than hydroxide ion. 0ptions:12,9,7 or 3

    asked by kody
  11. Principle of Marketing

    Requirement 3: Television or Radio Advertisement (20 Points) For this requirement, each team will create a storyboard or script for a television or radio advertisement. An average radio or television ad is about 30 seconds, so have that in mind. You can

    asked by Kiara
  12. American literature

    1. Reread the final paragraph of the speech of Pontiac (page 445) and the closing lines of Logan’s message, as set down by Jefferson (page 450). Between oral discourse and written discourse, what are the crucial differences in reaching and holding the

    asked by Kiara
  13. American literature

    3. Red Jacket and Tecumseh in their respective speeches (again, as translated and transcribed), make frequent reference to “brothers” and brotherhood. Why such emphasis, at that historical moment, upon fraternity and unity? Read Native Americans:

    asked by Kiara
  14. Chemistry

    I have previously posted this question, but now I am lost question: A calorimeter is filled with 10.0 millimole (mmole) of methane gas and an excess of oxygen. When burned, the ignition wire releases 107.2 J of heat. The heat capacity of the calorimeter

    asked by Liz
  15. Macroeconomics

    Suppose the demand curve is given by Q=200-20p. What is the price elasticity at P=$4? is demand elastic or inelastic at this point?

    asked by Yvette
  16. Sociology

    In the U.S., which social class has benefitted the most from the tax breaks?

    asked by Katrina
  17. math

    Evaluate: 4^8 + 4^8 + 4^8 + 4^8 + 4^8 + 4^8 + 4^8 + 4^8

    asked by peter
  18. English

    1. Today, millions of people have one form of religion, and their neighbors a different one. 2. Today, millions of people have one form of religion, and their neighbors a different religion. 3. Today, millions of people have one form of religion, and their

    asked by rfvv
  19. English

    They have learned to live in peace in the same state. -------------------------- What does 'state' mean in the sentence? Does 'state' mean 'country' or 'one of the States' in the USA?

    asked by rfvv
  20. English

    1. They realize that a different religion is something to talk about, not to fight about. ------------------ What is the full form of #1? 2. They realize that a different religion is something to talk about, and it is not something to fight about. 3. They

    asked by rfvv
  21. Algebra

    Which set of population data is the least dispersed from its mean? 2, 3, 2, 9 4, 0, 4, 0 6, 2, 2, 2 9, 3, 5, 3

    asked by Junior
  22. Maths

    A painter uses a trestle to stand on in order to paint a ceiling. It consists of 2 stepladders connected by a 4 metre long plank.The inner feet of the 2 stepladders are 3 metre apart, and each ladder has slopping sides of 2.5 metres. How high of the ground

    asked by Ravneet
  23. Math

    Shelly delivers the weekly local paper to neighborhoods in her town. House numbers are even on one side of the street and odd on the other. Shelly delivers an equal number of papers to both sides of the street. Although she always aims for the front

    asked by Elizabeth
  24. Dynamics

    The propellers of a ship of weight W can produce a propulsive force F0; they produce a force of the same magnitude but of opposite direction when the engines are reversed. Knowing that the ship was proceeding forward at its maximum speed v0 when the

    asked by Dynamics Problems
  25. help

    If you could design a study on anything about human behavior to show how it is the same across cultures, what would that be?

    asked by april
  26. statistics

    Suppose a study is done in which several random samples of people from a population are taken and polled on the number of hours per night they sleep. It is determined that the sample proportion for those who sleep at least 8 hours a night is 36%, and the

    asked by frank
  27. chemistry step by step for me. Thank a lot

    342gm of 20% by mass of ba(oh)2 solution sq gr .57 is reacted with 1200ml of 2m hn03. if the find density is same as pure water then molarity of the ion in resulting solution by nature of the above solution is dentified. The answer 0.888M Who helps me to

    asked by Ken
  28. maths

    In a purse for every 8 notes of 10/- it should have 5 notes of 5/-. For every 8 notes of 5/- it should have 3 notes of 1/-. If value of 5 notes =200 then what is the total amount in the purse?

    asked by nisha
  29. science

    does density affect weight?

    asked by sara
  30. finance

    What is the payback period of the following project? Initial Investment: $50,000 Projected life: 8 years Net cash flows each year: $10,000

    asked by jill
  31. Chemistry

    The pH of an acid solution is 5.90. Calculate the Ka for the monoprotic acid. The initial acid concentration is 0.10 M. What I have done: pH = 5.9 a = 10^-5.9 = 1.2589 * 10^-6 Ka = [H+][A-]/[HA] Ka = (1.2589*10^-6)^2/(.01-1.2589) I got -1.26903013E-12, but

    asked by Wren
  32. PHI 208

    Hill refers to the ability to understand oneself, to face oneself, and to be honest about the kind of creature one is by this term

    asked by ANDREW
  33. Dynamics

    A particle is attached to point O from A by the force F=-k/x3. If x=x0 and v=0 when t=0, determine velocity and acceleration as a function of x, and the time it takes to travel from A to O.

    asked by Dynamics Problems
  34. chemistry

    3. Calculate the standard entropy change for the reaction: N2 + 3H2 → 2NH3 given the standard entropies Sº(N2)(g) = 191.6 J K^-1 mol^-1 Sº(H2)(g) = 130.6 J K^-1 mol^-1 Sº(NH3)(g) = 193.3 J K^-1 mol^-1

    asked by John
  35. math

    find the montly payment needed to amortize principal and interest for a 130000 fixed rate mortgage with a 10.5% rate and a 30 year term

    asked by kuku
  36. Algebra

    The weights of boxes of candies produced in a factory are normally distributed with a mean weight of 16 oz and a standard deviation of 1 oz. What is the weight of a box of candies with a z-score of 2? 16 oz 18 oz 20 oz 22 oz

    asked by Junior
  37. Algebra

    combine the like terms -9x - 13x = 12x

    asked by sharon
  38. Math

    In the tradition of their Native American ancestors, Decorah Custom Canoes specializes in creating handcrafted canoes using the finest natural materials. Whether they are from birch bark or cedar, all canoes are custom-built from native wood. Each piece is

    asked by Peg
  39. History

    Why should Uncle Toms Cabin be a part of the US History curriculum? Please explain!

    asked by Natalie
  40. stats

    what is the probability that a 6 digit phone number contains at least one 8?

    asked by michelle
  41. Algebra

    identify the terms in each expression -4 - -3 + 2xy

    asked by sharon
  42. English

    Can anyone tell me where I can find an example of verbal irony in 'Don Quixote' chapter 8. I've reread the passage several times and just can not pinpoint it. The closest example I can find to irony in that passage is "with it I propose to do such

    asked by Eri
  43. statistics

    Construct a 95% prediction interval for the number of hours of sleep for an adult who is 45 years old

    asked by Terry
  44. momentum


    asked by Anonymous
  45. Physics

    If mass A is 1.0 kg, mass B is 5.0 kg, and the frictionless pulley has a mass of 0.5 kg and a radius of 0.15 m, what is the velocity of A and B at 0.5 seconds?

    asked by Rye
  46. Grammar

    was incarnate or was incarnated

    asked by Anonymous
  47. Accounting

    If the net income is $50000, and the cost of goods sold is $450000. the company's gross profit rate is 40% what are the net sales??

    asked by Bree