# Questions Asked onJuly 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

2. ## History

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

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.

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

5. ## Psychology

analyze the function of emotions as motive.

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 =)

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.

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

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

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

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

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:

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

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?

16. ## Sociology

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

17. ## math

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

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

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?

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

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

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

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

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

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?

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

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

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?

29. ## science

does density affect weight?

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

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

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

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.

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

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

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

37. ## Algebra

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

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

39. ## History

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

40. ## stats

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

41. ## Algebra

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

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

43. ## statistics

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

322n

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?