Questions Asked on
May 11, 2008

  1. chemistry

    determine the vapor pressure of a solution at 55 degrees C that contains 34.2g NaCl in 375 mL of water. The vapor pressure of pure water at 55 degrees C is 118.1 torr. so Psolution=XsolventPsolvent I don't know why I'm not getting the correct answer... so

    asked by natash
  2. chem

    HOw much energy is required to heat 36.0g H2O from a liquid at 65C to a gas at 115C? The following physical data may be uselful. Hvap=40.7kJ/mol C liquid=4.18 C gas=2.01 C solid= 2.09 T melting=0 C T boiling=100 C The answers about 87.7 kJ However I'm not

    asked by natash
  3. chem

    Calculate the mole fraction of total ions in an aqueous solution prepared by dissolving .400 moles of MgCl2 in 850.0g of water. mole fraction =amount solute(in mols) /total amount of solute and solvent (in mols) so wouldn't it be .400/ .400+ 47.2 which is

    asked by natash
  4. chem

    which of the following substances should have the highest melting point? Xe F2 SrS MgO CO2 the answers D, is it because its an ionic compound?

    asked by natash
  5. science

    Does sugar crystals grow faster in tap water or distilled water?

    asked by Eboni
  6. physics

    A 2 kg block, starting from the rest, slides 20 m down frictionless inclined plane, dropping a distance of 10m. The magnitude of the net force on the block while it is sliding is...? How do I solve this problem? And if it were to ask for the speed at the

    asked by Anonymous
  7. chemistry

    write the balanced half reaction for the conversion of Cl2(g)to Cl-(aq)

    asked by amethyst
  8. English; grammar

    Could you please tell me if I have properly identified the part of speech of each word. If I have made a mistake, could you please correct me. - Word: femurs Sentance:Jawbones, hipbones, femurs. Part of Speech:NOUN Word: Apache Sentance: White smoke puffed

    asked by Lena
  9. chemistry

    Using a BCA table, calculate the molarity of a 25.0 mL sample of HNO3 that's is titrated to its endpoint with 22.7 mL of 0.200 M NaOH.

    asked by caleb
  10. i hate.."chemistry"

    write the balanced half reaction for the conversion of HOBr(aq) to Br2(aq) in acidic solution

    asked by amethyst
  11. health care

    Why is economic issue a problem to the aging population?

    asked by Stacy
  12. math

    Factorise:- 27p^3-1/216-9/2p^2+1/4p

    asked by MANU
  13. financial resources

    Assignment Type: Discussion Board Deliverable Length: 2-3 paragraphs Points Possible: 55 Due Date: 5/18/2008 11:59:59 PM CT Bob Brown was recently involved in a minor auto accident. His car was hit from behind, and he, in turn, slammed into the car in

    asked by Anonymous
  14. chemistry

    The specific gravity of a sample of concentrated nitric acid is 1.42. What is the volume in liters at 20oC occupied by 145.3 g of this concentrate nitric acid?

    asked by Esmeralda
  15. Physics

    A 10kg block is attached to a massless cord that doesn't stretch or sag which is rapped around a disc like wheel, m=5Kg, I= (1/2)mR^2. If the block is allowed to drop straight down held back only by the rotation of the wheel: 1. What is the tension of the

    asked by Jimmy
  16. science

    write the balanced half reaction for the conversion of CL(g)to Cl-(aq)

    asked by amethyst
  17. precalculus

    A force of 369 lbs makes an angle of 18 degrees 20 minutes with a force 427 lbs. Find the angle made by the equilibrant with the 369 lbs force. I know I can find this using the law of cosines, but I think my teacher wants me to use some vector thing, but I

    asked by Iamxe
  18. chem

    In the reaction of calcium metal and water, 50.0 mL of hydrogen gas is collected over water at 25.0 degrees C with a total pressure of 752 mmHg. Calcualte the number of moles of hydrogen gas that was produced. Do we just plug this into n=pv/rt ? or is

    asked by natash
  19. French

    Good evening Could you please check if i have written these sentences corretly into french. Thank a billion. 1 I will feel very sad and lonely in the dungeon. I would miss the outdoors, friends and my family. (Je me sentirai très triste et seul dans le

    asked by Selaine
  20. English 102(writing in the discipline)

    I have a problem bout my subtopic of my research paper. This is my Outline The Importance of Networking in Business Networking is the most effective way in making your business grow faster. I. Importance of networking in business II. Types of network used

    asked by james
  21. chem

    determine the oxidation number of MgBR2(s) and NH4No3(s)

    asked by ama
  22. social std.

    How was Louis XVI responsible for out- berak of Freanch Revolution ?

    asked by PULKIT
  23. algebra

    THe length of a rectangle is twice the width. The area is 200yd^2. What is the length and width. Is this right L=20 w=10

    asked by Jack
  24. Statistics

    Suppose you conduct a study and find that the probability of having a baby boy is 60%. Now suppose three of your relatives are going to have babies. a) Build a tree diagram showing all the conditional probabilities and joint probabilities associated with

    asked by Danny
  25. algebra

    The number of tickets soldeach day for an upcoming performance of Handiel Messiah is given by N(x)=-0.4x^2+9.6x+10,where x is the number of days since the concert was first announced. WHen will daily ticket sales peak and how many tickets will be sold that

    asked by Jack
  26. French

    Good afternoon, Could you please help me make sure i have translated these sentences correctly. 1)Comment tu te sentiras dans le cachot (qui ou qu'est-ce que vous manquerez le plus) -How you will feel in the dungeon (which or what you will miss more)?

    asked by Selaine
  27. Math

    How do you graph the quadratic formula x^2-10x=11? Here's what I got so far: In standard form, it's x^2-10x-11=0. Discriminant: -10^2-4(1)(-11)=144 Axis of Symmetry: 10^2/2(1)=50 Quadratic Formula: 56 and 44 Thank You!

    asked by Naoko
  28. Math, derivatives

    Let g(x) = sin (cos x^3) Find g ' (x): The choices are a) -3x^2sinx^3cos(cos x^3) b) -3x^2sinx^3sin(cos x^3) c) -3x^2cosx^3sin(cos x^3) d) 3x^2sin^2(cos x^3) I'm not exactly sure where I should start. Should I begin with d/dx of sin? Or do the inside

    asked by Marissa
  29. chemistry

    For which trial(s) is phenophthalein a good indicator? For which trial(s) was it a poor indicator? For those trials in which it was a poor indicator, suggeest a better indicator and indicate its pH range on the titration curve. So for phenophthalein the

    asked by Amy
  30. science

    which physics principles are employed in stopping a runaway truck in a gravel and sand ramp at the bottom of a mountain?

    asked by sam
  31. Spanish

    Please correct my work please: This is what I'm working on: Command form(imperative mood)negative familiar/polite. I have to change the following affirmative commands to the negative form. (write the word no, the object pronoun(s), and the negative command

    asked by John
  32. home economics

    Critically assess the HDI as a measure of development. What do you think should be added to the HDI to measure development? Using an example and creating some new spheres or indices within the HDI, create an example showing how countries might rank with

    asked by mentee
  33. math

    justin had $49 before spending y dollars on jeans. How much money remains

    asked by Lisaraye
  34. Math

    For all real numbers, f(x)=(x^2+1)/2. If f(a)=25 and f(11)=b, what could be the value of b-a? I'm confused on how you do these problems. Can someone show me how to do them? Thanks much!

    asked by Monique
  35. Chemistry, electrochem

    (1) Half-reactions are written as ______ reactions with charge and mass balanced. (2) Among the ions, Cd^2+, Pb^2+ & Ca^2+, ________ has the greatest ability to reduce to its neutral metal. (3) Among the neutral metals; Pb, Ca & Cd, ________ has the least

    asked by Terry
  36. RE: Spanish

    I have a PC, not Mac. And I tried to answer them in the best of my ability. The thing that really threw me are the reflexives. Enciendamela ahora = No me la Encienda Inscribete en ese curso = (still unsure) Quitatelos antes de comer = No los Quitates

    asked by John
  37. statistics

    you have 8 blue marbles, 7 red marbles, and 5 green marbles. What is the probability of obtaining at least 2 red marbles in three draws with replacements? I have the answer, just can't figure out how to get it. Thanks!

    asked by Christine
  38. math

    I need help with a question... In this case k and l are parallel lines and contain the given points of: k=(2,5),(8,14) and l=(5,3),(11,y)... how do I calculate for y? Please help!

    asked by Cici
  39. Adv. Math

    The perimeter of a rectangle is 150 ins. The length is 3 ins. longer than 5 times the width. Find the length. A)63 B)12 C)36 D)38

    asked by Kenya
  40. chem

    write the balanced half-reaction for the conversion of Fe(s)to Fe+2(aq)

    asked by ama
  41. mathematics

    If 3xy^3 - 4x = 10y^2, find y ' (x) a) (4 + 3y^2)/(9xy^2 + 20y) b) (4 - 3y^2)/(9xy^2 - 20y) c) (3 + 4y^2)/(20xy^2 + 9y) d) (3 - 4y^2)/(20xy^2 - 9y)

    asked by Donna
  42. SCIENCE

    How many types of catalists are there ? Name each of them.

    asked by PULKIT
  43. health care

    what are three issues faced by the aging population that you believe to be a problem? any ideas please?

    asked by Stacy
  44. home economics

    You are gathering demographic data in a village. You suspect that families have a gender bias; that is, they have children until a certain target number of sons are born, but you don’t have direct evidence of this. All you have is information on the sex

    asked by economist
  45. math... help me.. please =)

    Hello. I'm learning about simplying radicals and in one of the questions it has a variable to the second power like below: 1) square root of 28x^2 2) square root of 25x^2 3) square root of 80n^2 Can you answer at least one of them and explain what you did?

    asked by Lola
  46. english

    I'm having trouble paraphrasing this: Einstein used his light-quantum hypothesis to explain another important puzzle, the photoelectric effect. Can you help?

    asked by Anonymous
  47. algebra

    radicals

    asked by jerry
  48. alg 2

    write an equation for the conic section Ellipse with vertices at (-2,2)and (4,2) and covertices at (1,1) and (1,3)

    asked by trista
  49. English

    Ms. sue I am writing a paper on cost of food today. Where can I find graph or table showing the increase in price for food and gasoline. Please help. Rose

    asked by rose- Ms. sue
  50. science

    Is there a relationship between ozone depletion and global warming?

    asked by Charlotte
  51. chemistry

    Draw three repeating units of the condensation polymer made from ethanedioic acid and ethanediol.

    asked by Lindsey
  52. NEED INFORMATION

    DO YOU KNOW WHERE I COULD GET INFORMATION ON THE DEVELOPMENT AND CHALLENGES OF THE HEALTH AND EDUCATION SYSTEM IN GUINEA, WEST AFRICA, SINCE IT'S INDEPENDENCE?

    asked by MARY
  53. Accounting Question

    Below are two questions from my accounting class. I am not sure how to approach this kind of problem. Any help or suggestions would be greatly appreciated. Thanks in advance! ------------------------------ The following trial balance of Trane Corp. at

    asked by jason
  54. Science / Biology

    How does modern science explain the evolution of abiotic to biotic matter? How would the first life form have survived in the first day / week of its formation? What kind of system of organelles / biological functions would it have to form in the first day

    asked by Jess
  55. English

    I need a source bout the "Importance of networking in business" thank you very much to all the experts..

    asked by james
  56. algebra

    A student opens a mathmatics book to two facing pages. The product of the page numbers is 2352. Find the page numbers.

    asked by Jack
  57. History

    How was Charles II involved with the Royal Society and science in general?

    asked by Anna
  58. Electronics/Circuits

    Just a simple one... which symbol should I use to represent a strain gauge on circuit diagram? Thanks

    asked by Jake
  59. chemistry

    Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.

    asked by John
  60. French

    Could you please see if i have translated the following sentences correctly. Thanks 1. Five objects I would choose to have in my dungeon are (Cinq objets que je choisirais d'avoir dans mon cachot sont) 2. A computer to keep in contact with friends and

    asked by Selaine
  61. business

    Do tariffs help protect American Jobs and wages

    asked by Anonymous
  62. Biology

    What are the biological interrelationships among the life forms in the Galapagos Islands?

    asked by Will
  63. hardware

    Why is it recommended to establish a formal evaluation criterion when considering the purchase of hardware for the organization?

    asked by ed
  64. computers

    a) Different types of storage devices are optimal for different situations. Explain what situations are appropriate for the following devices and explain why: Hard disk Floppy disk RAM CD ROM Tape b) Explain the role of each of the following in determining

    asked by ed
  65. Biology

    What protections are already in place to safeguard and preserve the Galapagos Islands?

    asked by Will
  66. french- please help

    ugh please help me, im having such a huge stress over this! Le premier arrondissement de Paris est le plus petit et assez historique. Il a été créé le 24 mars 1852. Le population du premier arrondissement était approximativement de quatre-vingt dix

    asked by Dina
  67. statistics--clarification please

    I thought I was understanding this but I am really not sure about the symbols. Does the 3*(13/20)^2*(7/20) translate to 3 times 13/20 times 2 times 7/20? Sorry I am not up on the symbols... I will keep trying.

    asked by Christine
  68. chem

    assign oxidation numbers to PF-6(aq)

    asked by amethyst
  69. science

    why well is built in a shape of circle?

    asked by MANU
  70. human life

    Why in acient period people live more than the life span ???

    asked by PULKIT
  71. capital markets

    Hi can anybode help me in this question....With one numerical example show how government bonds are priced and their yields are calculated, and also explain how they provide the benchmark for the cost of funds for other borrowers?

    asked by URATA
  72. Economic Management Scients

    What is 'improper' tax which we get in South Africa?

    asked by Brandon
  73. Healthcare Technology

    Analyze disaster vulnerabilities in health care and human service organization. Write a vulnerability assessment report for an urban medical clinic serving low-income clientele as if you were a consultant. The clinic is located in the hot, dry desert

    asked by ANYI
  74. English

    how to make a body of research paper? I really don't know.. I have already my note cards.. all i have to do is to make a body of my research paper.. I have a question, does the body of research paper must not be on first person or second person? thank you

    asked by james
  75. English

    I have a problem bout my subtopic of my research paper. This is my Outline The Importance of Networking in Business Networking is the most effective way in making your business grow faster. I. Importance of networking in business II. Types of network used

    asked by james