# Questions Asked onJuly 24, 2010

1. ## chemistry

How do you know if these solutions are acidic, basic, or nearly neutral? a. NH4NO2 b. Cr(NO3)3

2. ## statistics

Let x be a random variable representing dividend yield of Australian bank stocks. We may assume that x has a normal distribution with sigma =2.3%. A random sample of 17 Australian bank stocks has a sample mean of x bar 7.74%. For the entire Australian

3. ## Physics

The figure below shows a thin rod, of length L and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m is attached to the other end. The rod is pulled aside through an angle θ and released. (a) What is the

4. ## Chemistry

What is the formula mass of ammonium phosphide, (NHsubscript4)subscript3P? 85.0 u 49.0 u 48.0 u 57.0 u I thought I was to look these up in the Periodic Table, but they aren't there, so I'm confused on what to do. Any help would be appreciated.

5. ## chemistry

What volume of 4.50M HCl can be made by mixing 5.65M HCl with 250 mL of 3.55M HCl?

A recent study revealed that most Americans have: a.strong moral values b. a strong desire to do what is right c. few moral absolutes d. a great desire to help their community

7. ## Chemistry

The standard heat of formation of solid ammonium nitrate. NH4NO3 is -330kJ/mol. The equation that represents this process is: a) N2(g)+ 4H2(g)+3O2(g)->NH4NO3+ 330kJ b) 2N(g)+ 4H(g)+ 3O(g)-> NH4NO3+ 330kJ c) NH4(g)+ NO3(g)-> NH4NO3+ 330kJ d) 0.5N2(g)+

8. ## chemistry

I had this on a test, not sure how to do it Explain, using balanced chemical reactions with the smallest integer coefficients, why each of following occurs. a. CuI2 (insoluble in pure water) dissolves readily in aqueous ammonia, HN3(aq) b. AgBr (insoluble

9. ## physic

A 0.20 kg ice cube at 0.0° C has sufficient heat added to it to cause total melting, and the resulting water is heated to70deg.Cel. > How much heat is added? (For water Lf=334kj/kg > andLv=2257kj/kg >

10. ## physic

An aluminum rod is 10.0 cm long and a steel rod is 80.0 cm long when both rods are at a temperature of15 degrees cel. Both rods have the same diameter. The rods are joined end-to-end to form a rod 90.0 cm long. The coefficients of linear expansion of

11. ## Physics

A 1.50 kg snowball is fired from a cliff 13.0 m high with an initial velocity of 14.0 m/s, directed 41.0° above the horizontal. (a) Using energy techniques, rather than techniques of Chapter 4, find the speed of the snowball as it reaches the ground below

12. ## Chemistry

Listerine mouthwash has 21.6% ethyl alcohol by volume. What mass of ethanol is contained in 20.0 mL of mouthwash ?! ( the density of ethanol is 0.789 g/mL.) how would yu do this problem ?!?!

13. ## chemistry

4Al + 3O2 ---> 2Al2O3 How many moles of Al2O3 are produced when 4.33 moles of Al are reacted?

14. ## physics question

A resistance box has the following components and tolerances: 10 resistors each of 100k§Ù ¡¾ 0.05% 10 resistors each of 10k§Ù ¡¾ 0.05% 10 resistors each of 1k§Ù ¡¾ 0.05% 10 resistors each of 100§Ù ¡¾ 0.1% 10 resistors each of 10§Ù ¡¾

15. ## chemistry

4Al + 3O2 ---> 2Al2O3 When 1.75 moles of Al are reacted, how many grams of Al2O3 are also reacted?

16. ## Chemistry

Is "sharpening a pencil" more of a physical change than souring of milk, fermenting of grape juice or rusting of iron? Thanks anyone!

Business relationships often present ethical dilemmas that are ________ 1. not easily resolved 2. easily resolved by following the relevant laws 3.best resolved by creating a lose-lose situation 4.irrelevant and therefore require no action

18. ## chem102

the following names are incorrect,draw their structures and supply the correct name.(a)2-isopropylpentane (b)3-ethyl-5-methylhexane

19. ## chemistry

A 0.1 M solution of acetic acid is titrated with 0.05M solution of NaOH. What is the pH when 60% of the acid has been neutralized? The equilibrium constant (Ka) for acetic acid is 1.8x10^-5

20. ## Chemistry

The molar enthalpies of combustion of CH3COCOOH(l)CH3COOH(l) and CO(g) are respectively -1275kJ/mol, -875kJ/mol, and -283kJ/mol. What is the enthalpy change for the reaction below? CH3COCOOH= CH3COOH +CO a)1867kJ b)-1867kJ c)117kJ d)-117kJ e)-2433kJ I

21. ## Chemistry

Consider the following two thermochemical equations N2+2.5O2-> N2O5(s) Delta H=xkJ N2+2.5O2-> N2O5(g) Delta H=ykJ The enthalpy change in kJ for the sublimation of one mole of N205 solid to gas would be represented by the quantity a)x+y b)x-y c)y-x d)-x-y

22. ## college

QuadPlex Cinema is the only movie theater in Idaho Falls. The nearest rival movie theater, the Cedar Bluff Twin, is 35 miles away in Pocatello. Thus QuadPlex Cinema possesses a degree of market power. Despite having market power, PuadPlex Cinema is

23. ## algebra 1

Use elimination to solve the the system of equations given by 10x-4y=-20 and 10x-5y=35. I can't figure this one out. Whenever I check my work, it is incorrect.

24. ## Chemistry

True or False? 1) Do Nuclear changes generally absorb more energy than chemical changes. 2) In Exothermic reactions, the reactants have more kinetic energy than the products. 3) If one molecule is involved the rate determining step is called first order.

25. ## Chemistry

I would really appreciate help with the following, as I don't understand how to work it. Thank you in advance for explaining it to me. The mass number (A) of a nuclide is equal to the number of --- blank --- in one of its nuclei. There are 4 answers to

26. ## Physics

Zero, a hypothetical planet, has a mass of 4.0 1023 kg, a radius of 3.0 106 m, and no atmosphere. A 14 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0 107 J, what will be its

27. ## chemistry

The values of Ksp for AgBr and AgCl, are 7.7x10^-13 and 1.6 x 10^-10. A solution containing a mixture of 2.0x10^-2 M Br and 2.0 x 10^-2M Cl is a candidate for separating using selective precipitation. Solid AgNO3 is added, with a miniature spatula, and

28. ## Trig

a) Determine the equation of a sine function that would have a range of {y€R|-7

29. ## economics ss

which is a valid generalization based on the information in the chart

30. ## algebra

lnx+ln(x+1)=ln12 Find all real-roots

31. ## research writing

Can someone help with com 220 wk6 day 6-subject-Global warming: Write a 350 word paragraph that uses one of your arguments and counterarguments to support your thesis. Be sure to include the evidence that supports your thesis and that may support or refute

32. ## Psychology

This branch of psychology is primarily concerned with what can be readily seen and recorded: (Points : 1) Cognitive psychology Psychoanalysis Moral Development Behaviorism Tiffany feels a sense of fulfillment when she volunteers at the school down the

33. ## Math / Probability

In a certian lottery, 4 differnt numbers between 1 and 11 inclusive are drawn. These are the winning numbers. A player selects 4 different numbers between 1 and 11. What is the probability that the player has all winning numbers?

34. ## Trig

Determine the roots of the function f(x)=-2cos(3x)-1. Can you please show all the work so it is easier to understand, thank you!!

35. ## Chemistry

A solution is made by dissolving 10.9 g of calcium chloride, CaCl2,in enough water to make exactly 500 mL of solution. What is the concentration (molarity) of CaCl2 in mol/L?

36. ## Math (Very Easy Math)

I'm kind of confused as to what simplified mean? Can you please provide me with a definiton... Like I'm kind of stumped as to what one is more simplified -7(2x + 3) or -14x -21 Please explain what it mean for an expression to be "simplified"

The table given below provides the shipping costs and supply available at each source. Find the minimum-cost shipping solution for the transportation problem. Provide a table of shipping quantities and the minimum value for the objective function for the

A resistance in a circuit is 470§Ù ¡¾ 10%. When a meter with a full-scale voltage of 25V and error of ¡¾ 3% is used to measure the voltage across the resistance, the voltage was read as 12V. Obtain the power across the resistance and determine its

39. ## math

Let triangle ABC be a triangle such that angle ACB is 135 degrees. Prove that AB^2 = AC^2 + BC^2 - (Root 2) x AC x BC

40. ## math

Factorise: a^4 + b^4 + c^4 - 2 (a^2 x b^2 + a^2 x c + b^2 x c)

41. ## chemistry

On average, how far is a molecule of air in the room in which you're sitting from the nearest molecule of air to it, assuming it is an ideal gas. Make appropriate assumptions about the temperature and pressure.

42. ## science

2 waves are travelling through container one has apmlitude of 3 cm and other is 9 cm ?wich one is strong wave?

43. ## Finance

How come no one is answering any of the Finance questions?

44. ## chem

7.50gram quantity of a diprotic acid was dissolved in water and made up to exactly 250ml. If 25ml of this solution were neutralized by 11.1 mL of 1.0 M KOH then what is the molar mass of the acid? I did 7.50/5.55x10^-3

45. ## chemistry

what product will form from dehydration of 2-methylcyclohexanol?

46. ## General Science

you plan an experiment to test the growth of beans using three different fertilizer. What are the dependent and independent variables in the experiment?

47. ## agriculture

can you unscramble this. It has to do with farming. dgpcrtouins

48. ## algebra 1

What point is a solution to the system of inequalities y(inequality arrow pointing right)4x and y(inequality arrow pointing right)-2x-3? -1/2,-2?

49. ## math/probability

For some reason I can not get my head around probability. Please show me how to work the problem not just the answers. A class has 11 students who are to be assigned seating by lot. What is the probability that the students will be arranged in order from

50. ## Chemistry

I have a problem that I'm wondering is a "trick" question. How many nucleons are there in an atom of 235 (atomic mass) over 92 (atomic #) U? According to the periodic table, the atomic mass is 238, not 235. Any comments? Thanks a lot!

51. ## Chemistry

The molar enthalpies of combustion of CH3COCOOH(l)CH3COOH(l) and CO(g) are respectively -1275kJ/mol, -875kJ/mol, and -283kJ/mol. What is the enthalpy change for the reaction below? CH3COCOOH= CH3COOH+CO a)1867kJ b)-1867kJ c)117kJ d)-117kJ e)-2433kJ I think

Difference between Atomic spectrum and emission spectrum. First give me the clear cut definition of both and then the difference!!!

53. ## chemistry

A sample of gas has a volume of 5.3 L at 7.00 ºC. What volume will the gas have if the temperature is increased to 14.00 ºC? (6 pts) .

55. ## Biology

What are the 7 properties that all living things share?

56. ## Chemistry

When zinc, iron and lead are reacted with hydrochloric acid the variable most easily measured in order to determine the effect of the chemical nature of the reactants on reaction rate is a)temperature b)colour c)surface area d)volume of gas e)concentration

57. ## caring for school -age children

WWHEN PROPERLY EXECUTED,THE BEHAVIOR MANAGEMENT STRATEGY KNOW AS TIME-OUT BECOMES (A)A POSITIVE REINFORCEE (B) MORE EFFECTIVE THAN LOGICAL CONSEQUENCE (C) A CONVERSATION BETWEEN CHILD AND ADULT (D) SUITABLE PUNISHMENT FOR MISBEHAVIOR 2. WHICH OF THE

58. ## Calculus

Can someone help me to integrate by substitution the indefinite integral: (sinx)/ (1+cos(^2)x)?

59. ## Simple ratio question but confused.

This is ratio Question but i m not fimilar with this type of ratio . 1/3:x=1/3 Plz guide me some one .. I cam with answe 1/9* nee d help

60. ## hcp210

In what timeframe do you see things changing in pharmacy practice and how will those changes impact society. this is part of my final project due Sunday, promptness is greatly appreciated.

61. ## math/ measurment

What is the measure of the point angle for a star-shaped polygon with 8 points and a dent angle of 130 degrees? Is there a formula to figure this?

62. ## History 1301

I am to describe how the differences (of human history in North America during the 8000bc era and the asia euriasia and europe era) affected the internation state affairs of 1450. I don't even know where to begin.

63. ## math

Let triangle ABC be a triangle such that angle ACB is 135 degrees. Prove that AB^2 = AC^2 + BC^2 - (Root 2) x AC x BC

64. ## math

Simplify: 2/1! - 3/2! + 4/3! - 5/4! + ..... + 2010/2009! - 2011/2010! Where k! is the multiplication of all numbers up to k (e.g. 5! = 5x4x3x2x1=120)

65. ## Math

2independant alternators. probabalitity one will fail in a 1 hour flight is .02 what is the probablility both will

66. ## Calc I

y = (x^2 -4)/(x^2 - x -12) dy/dx of numerator I got 2x dy/dx of denomenator I got 2x - 1 dy/dx of y I got (x^2 - 16x -4)/((x-4)^2(x+3)^2) setting numerator to zero and solving got 8 +/- sqrt(65) with the critical value being the + setting denomenator to

67. ## General Science

The four elements of weather are:

68. ## Calc I

Yes I was trying to find the range y = (x^2 -4)/(x^2 - x -12) ok using 2(4 +/- sqrt(15) ) sorry I forgot the minus in the derivitive but ya that makes sense but however I need three critical values that only gives me graph it and you'll see there are three

The average light output for a domestic bulb is 80 lumens with a range of 4 lumens when process is in control. Sample size is 6. What are the CL, UCL and LCL for the X-Bar and R charts?

70. ## caring for scool-age childfren

duing a science acivity, you overhear a colleague asking a group of hildren, "how many different ways can you think of to build a bridge that will hold this weight. this conversation is an axample of (a) divergent question (b) convergent (c) scaffolding

71. ## English

correct the following tenese please soemone help me as soon as possible plz plz Concentration does not mean (1) think only one idea. Concentration means holding a central issue in mind while you (2)except or reject ideas that are related to that issue. In

72. ## English

this is y reasrech paper about a poem in which mother have abortion and she is not happy.i m worried about grammar mistakes ,can someone please check it for me? Ghost Babies Haunted their Mothers “The mother” is a poem about a woman who is guilty to

73. ## science

Can a car climb over ramp of slope of 1m vertical to 2.4m horizondal

74. ## english

are food science and technology too broaad for a research?im going to talk about their differences

If I want to live in the state of California in the future, there is one concern that I have. Since most of California's major cities are fairly close to the San Andreas fault line, I can expect earthquakes. Are all the buildings earthquake-proof? I want

76. ## Maths

ABC x C ____ 16BC _____ What could the value of C be?

77. ## geography

how does geography affect the economy of Asian countreis???????? and give any picture of that which will support my eassy

78. ## math

The sales tax rate in a state is 8%. If you pay a tax of \$2.50 on an item purchased, what is the selling price? Plaese identify the BASE in this problem.

79. ## AED/204

I need to create a multiculture lesson plan, I was thinking that I would try and do one during the christmas season with students that celebrate christmas and those that don't also having a students of different ethnic background and the different ways

80. ## stats

Let z be a random variable with a standard normal distribution, P(-1.9

81. ## maths

in the ques they got a square divided in 2 each block has the number 4 in it and there r 4 block thats the 1st ques. the other 1 says 2 in the 1st and 2nd block and in the 3rd n 4th block it say 1 now hw to draw it on the grid

82. ## Finance

Select a company and country that interests you. You have been asked to evaluate the country you selected as a potential market for your product(s)/service(s) and present your findings to other managers of the organization in a memo. In your memo, be sure

83. ## Chemistry

What is the overall order of reaction for the elementary system A+2B=products? a)0 b)1 c)2 d)3 e)5 Can somebody explain this question to me. I don't get it.

84. ## Chemistry

What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) but d) is very tempting