Questions Asked on
July 24, 2010

  1. chemistry

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

    asked by Jin
  2. chemistry

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

    asked by casey
  3. 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.

    asked by Sam
  4. 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

    asked by ong
  5. 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

    asked by Clay
  6. 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 >

    asked by kristin
  7. 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?

    asked by Jaime
  8. 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

    asked by Matt
  9. 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

    asked by Terra
  10. business

    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

    asked by cameron
  11. 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

    asked by Jin
  12. 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

    asked by Bobby
  13. Chemistry

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

    asked by Kris
  14. 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

    asked by Bob
  15. 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

    asked by shan
  16. 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)+

    asked by Bobby
  17. 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!

    asked by Jean
  18. 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

    asked by Sapna
  19. 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

    asked by mee
  20. Biology

    What are the 7 properties that all living things share?

    asked by Cecilia
  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

    asked by Bob
  22. 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.

    asked by Bob
  23. 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

    asked by Bob
  24. 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

    asked by Kelly
  25. 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

    asked by action
  26. science

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

    asked by shan
  27. business

    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

    asked by Anonymous
  28. Calculus

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

    asked by Em
  29. 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

    asked by shan
  30. 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

    asked by Aysha
  31. science

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

    asked by sonu
  32. 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.

    asked by Christian
  33. 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 ?!?!

    asked by Nicole
  34. algebra

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

    asked by Kris
  35. english

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

    asked by anonymous
  36. chemistry

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

    asked by jae
  37. chemistry

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

    asked by jae
  38. 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.

    asked by Nancyg
  39. chem102

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

    asked by kabelo
  40. 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

    asked by Jean
  41. Advice

    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

    asked by AL 92
  42. Maths

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

    asked by Jasmine
  43. geography

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

    asked by sandeep
  44. 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?

    asked by Lily
  45. 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.

    asked by Lily
  46. 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

    asked by Jaime
  47. 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?

    asked by Jaime
  48. Finance

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

    asked by tricica
  49. 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

    asked by jay 2
  50. physcis problem ,please help

    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

    asked by ong
  51. 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.

    asked by barb
  52. 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

    asked by Sally
  53. 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

    asked by eric
  54. 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.

    asked by Kali
  55. 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

    asked by eric
  56. 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

    asked by eric
  57. 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)

    asked by eric
  58. math

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

    asked by eric
  59. 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.

    asked by eric
  60. 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

    asked by Jin
  61. 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

    asked by Jin
  62. 11th grade Physics

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

    asked by Akashdeep Singh
  63. 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

    asked by Paul
  64. economics ss

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

    asked by kevin
  65. Math

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

    asked by Peg
  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

    asked by Kate
  67. stats

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

    asked by Clay
  68. 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

    asked by neill
  69. 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!!

    asked by Nada
  70. 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) .

    asked by Anonymous
  71. chemistry

    what product will form from dehydration of 2-methylcyclohexanol?

    asked by dede
  72. Trig

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

    asked by Nada
  73. 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?

    asked by Diane
  74. General Science

    The four elements of weather are:

    asked by Diane
  75. 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

    asked by Kate
  76. 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?

    asked by Shelia
  77. Math115

    -4/5 + (-3/4) how do I work this? Will the answer be positive or negative? Please help me!!!!!

    asked by barb
  78. 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

    asked by Bob
  79. 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

    asked by Terra
  80. business

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

    asked by james
  81. baseball

    Pete Rose was a great ballplayer back in the day w/Cincinatti, Philadelphia, and Montreal. He should've been a Hall-of-Famer, but he was banned from baseball in 1989. Why did he start gambling prior to his ban?

    asked by AL 92
  82. music

    how to beat your hands using the 4/4, 3/4 and 2/4 technique?

    asked by gladys
  83. agriculture

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

    asked by laurie
  84. 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"

    asked by Kate
  85. Business

    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?

    asked by Carmen
  86. caring for school -age children


    asked by action