Questions Asked on
March 23, 2007

  1. Chem

    A solution is made by mixing 50.0 g C3H6O and 50.0 g of CH3OH. What is the vapor pressure of this solution at 25 degrees C? What is the composition of the vapor expressed as a mole fraction? Assume ideal solution and gas behavior. (At 25 degrees C the

    asked by Christopher
  2. physics please

    A series of pulse of amplitude 0.15 m are sent down a string that is attached to a post at one end. The pulses are reflected at the post and travel back along the string without loss of amplitude. What is the amplitude at a point on the string where two

    asked by kimberley
  3. Chemistry

    when pure sodium hydroxide is dissolved in water , heat is evolved in a laboratory experiment measure a molar heat of solution of sodium hydroxide the following procedure was followed. to a calorimeter containing 300g of water at 20.0 C and 10.65g of NaOH

    asked by jim
  4. Chemistry

    this makes absolutley no sense I plug all this into my calculator but I get different results. The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH. [H3O+] = 10-pH or [H3O+] = antilog

    asked by Jon
  5. math.help

    am i correct on this radical (-121) the radicand is negative 121 cannot be evaluated. The square root of -121 is the imaginary number 11i, where "i" is the symbol for the square root of -1. Actually, -11i is also an answer.

    asked by jas20
  6. PLEASE HELP SOLVE RIDDLE

    I jump I run, I am one of four, you can find me hanging around your door. What am I? Please help I'm usually great at answering these. But I am lost on this one. PLEASE tell us if you get the answer :) what weighs a lot going forward but not backwards? Two

    asked by tmyk
  7. Chem

    I'm having a lot of trouble with a simple problem. I have a 3.0% by man solution of H2O2 in H2O. The density of thr solution is 1.0 g/mL. I need to find the molarity. How do I do this? So far I have: 3.0g H2O2 x 1 mol/34.02 g= .0881 mol I'm not sure where

    asked by Christopher
  8. mass communication

    who is target audience of sex and the city? Please note that we don't do students' homework for them. Once YOU have come up with a response to YOUR questions, please re-post and let us know what you think. Then someone here will be happy to critique your

    asked by Fran
  9. chem

    this is my question Calculate the hydronium ion consentration and the hydroxide concentration in blood in which the PH is 7.3. I don't have invlog on my calculator so I hit log(7.3)= .863 for hydronium. Is this dumb for me to do? That is dumb for you to

    asked by Jon
  10. Math

    Rose's garden is in the shape of a trapezoid. If the height of the trapezoid is 16m, one base is 20m and the area is 224m2, what is the length of the other base? The area of a trapezoid is: A= (1/2) h (b1 + b2) ...where h = height and b1, b2 are the bases.

    asked by Tony
  11. (Life)

    What is a good conflict resolution technique for employees? Talk together. Work it out. Compromise. If you cannot do this, consult your employer. Are you talking about conflict resolution among employees or between employees and employers? Elizabeth's

    asked by Devon
  12. history

    When did people stop using parchment and start using paper? These sites will give you the history of paper: (Broken Link Removed) http://inventors.about.com/library/inventors/blpapermaking.htm I'm not really sure as to the answer. You see, I'm writing a

    asked by Elizabeth
  13. Chemistry

    At saturation 1.5 x 10^-4 moles caF2 have dissolved in 1L of water. What is Ksp for CaF2 at this temperature? CaF2(s) ==> Ca^2+ + 2F^- Ksp = (Ca^2+)(F^-)^2 (Ca^2+) = 1.5 x 10^-4 mols/L (F^-) = 3.0 x 10^-4 mols/L. Plug into Ksp and solve. Post your work if

    asked by Christian
  14. Spanish 1

    Match the verbs and the subjects- 1. Maria(estudiar) 2.Nosotros(comer) 3. Yo(ser): el(ser) 4. El y ella no (vivir) 5. Tu (estar) Are there any pictures or sentences that go along with the subjects? All of these subjects could go with any verb. This site

    asked by Aubrey
  15. algebra

    A bicyclist rode into the country for 5hr. In returning her speed was 5 mi/h faster and the trip took 4 hr. what was her speed each way? What equation would I use to solve this problem i have no idea Let V be her speed going out, so V+5 will be her speed

    asked by rob
  16. algebra1

    Find to consecutive integers that the sum of 3 times the first integer and 6 times the second integer is 24. Define the variabls you use. If somebody can show me how to work this out, I will be very greatful for the help? consecutive integers, n, n+1 3n +

    asked by Malik
  17. algebra1

    What steps do I take in solving this problem? It is about graphing inequalities. 10x+4¡Ý9x+17 put the equation in the form of y ? x + constant. ? means greater than or less than. That is the first step. You are getting no more help until you start

    asked by keshia
  18. science

    what metal is in the form of a form of a thread or rod Many many metals can be in that form. You might try tungsten (also called wolfram) since that metal is so ductile.

    asked by memo
  19. hum 130

    I need to find at least two effects organized religion has had on society, and provide examples from past or present. Have you considered laws? Such as marriage, divorce? Have you considered social organization, such as family activities at gatherings,

    asked by Vicky
  20. phhysics

    picture in your mind a block that slides without friction down a ramp that is inclined at an angle (q) above the horizontal. Initially the block is at rest a distance (s) in meters (measured along the plane) from the bottom. Calculate the time (in seconds)

    asked by Charlene
  21. Micro Economics

    Briefly explain the following: (a)Economic cost and accounting cost. (b)Free market economy and mixed economy. (c)Marginal utility theory and indifference curves analysis. Please note that we don't do students' homework for them. Once YOU have come up with

    asked by Christine
  22. algebra1

    I need some help in sovling this problem. x+3y=9 show me how to solve for y. subtract x from each side. Then, divdide both sides by 3

    asked by mesha
  23. maths

    what is 45,429,444 to the nearest hundred-thousand? Hundred thousand digit... XX,YXX,XXX so would it be 454 hundred thousand?

    asked by meisha
  24. science

    what is a 18 leeter word for flow of charges through the circuit electrical currents ?

    asked by memo
  25. history

    What was the influence of King Louis XIV and Versailles upon other monarchs in Europe? There are a number of excellent articles on this page: http://www.google.com/search?hl=en&ie=ISO-8859-1&q=Louis+XIV%2C+influence+on+Europe&btnG=Google+Search

    asked by Dawn
  26. HISTORY PLEASE HELP FAST

    I need a fairly brief explanation of the Inquisition. All I know is that it has something to do with killing "heretics" whatever they are. Try typing it into Wikipedia. The first paragraph in the article should give you a brief explanation of the

    asked by Jenna
  27. READING

    I need help with one less letter than the previous word. (its in a sentence.) Please explain more about your assignment. Are you trying to make a new word from a previous word?

    asked by Timothy
  28. maths

    4x+3y=21 What is your question? You have simply stated the equation of a straight line. what is a prime factorazation?> expressing a number in terms of its Prime factors eg. 126 = 2*3*3*7 all the factors are prime numbers How does this relate to the first

    asked by abi
  29. math

    A=Bx5 B=C-4 And what it the question here? what

    asked by Ray
  30. criminology

    Why is it important to consider inversely the nexus between theory and policy? It is far more important to consider writing skills and clarity of communication. Can you possibly explain the meaning of consider inversely the nexus? Hmmm. "... consider

    asked by chris
  31. math,algebra

    I need help if someone can show me the steps to these 2 problems. Problem #1 Use the properties for radicals to simplify each of the following expressions. Assume that all variables represent positive real numbers. radical and inside of the radical theres

    asked by jas20
  32. business and finance

    An eletronics store wants to order at least 3 times as many DVD players as VHS players. Write an inequality expressing this relationship. Define the variable you use. I have no idea on how to solve this. Can somebody show me how to solve this problem? DVD

    asked by Carmela
  33. algebra help

    I am really confused on this question can some one help me out please the length of a rectangular playing field is 5 ft less than twice its width If the perimeter of the playing field is 230 ft. find the length and width of the field. I believe i am

    asked by sara
  34. chemistry

    Calculate the hydronium ion consentration and the hydroxide concentration in blood in which the PH is 7.3. Hydronium = [H3O+] = 10-pH or [H3O+] = antilog (- pH) and I got 1.00 x 10^7.3 for both concentrations is this correct? ABsolutely silly. You did not

    asked by Jon
  35. psychology

    what is an illusion? mention any three illusions and explain them http://hlavolamy.szm.sk/brainteasers/optical-illusions-4.htm http://www.onelook.com/?w=illusion&ls=a So an illusion is something that people believe that is false. Some students have the

    asked by gen
  36. Mass Communication

    The act of communication is best understood as one that has social implications.Explain briefly Please note that we don't do students' homework for them. Once YOU have come up with a response to YOUR questions, please re-post and let us know what you

    asked by Christine
  37. Mass Communication

    what is meant by persuasive communication?Explain breifly I've clicked through a few and have only seen what seem to be a lot of homework questions. But I have not understood what your confusion is on many of them. Do you now understand what they are

    asked by Christine
  38. algebra1

    could some possibliy go through the steps in sovling this problem for me? x/7+5=9 subtract five from each side. Then, multiply both sides by seven

    asked by joe
  39. science

    a coomon mineral in solid form Quartz, among thousands of choices. Some are more common than others.

    asked by nick
  40. algebra1

    How do I solve this x/3=-4? multiply both sides by 3 Please stop posting under sundry names. You are doing yourself no good. What do you mean by sundry names? What's up with you telling me this because I don't know what you mean? My name is Kevin Shaw!

    asked by kevin
  41. Help! Music..

    I need to know to where i can get the karaoke version of "All or nothing" by O-TOWN. I need it for a music presentation..[sigh] I have to sing it... plz help

    asked by Cindy
  42. Career

    can one define postive mental attitude This is an opinion question, I am assuming. What do you think? If you still need help developing your ideas, just ask. This is as good a definition as any. http://en.wikipedia.org/wiki/Positive_mental_attitude My

    asked by Bryan
  43. Spanish 1

    Conjugate the following verbs in Spanish- 1. Estudiar- singular and plural 2. correr- singular and plural 3. vivir- singular and plural This site will help you with that: http://www.spaleon.com/conj.php Thank you for using the Jiskha Homework Help Forum.

    asked by Aubrey
  44. MATH!+ check please~ thanks in advance!

    the equation 2x^2+ cy^2+Dx+Ey+f= 0 represent a conic. state the value(s) of C for which each of the following are possible: A circle: My answer: c= 2 an ellipse: My answer: c>0, cant equal 2 Parabola: My answer:c=0 a hyperbola: My answer: c

    asked by conics!?
  45. Social Studies

    They can be 2-5 paragraph essays, not looking for excellent work just easy essays to turn in...if i don't do these i dnt pass my senior year, this is make-up work from 10th grade .. Essays i need done: -Charcter analysis of an epic hero(essay and sketch).

    asked by John
  46. personal finance

    Sue and Tom Wright are assistant professors at the local university. They each take home about $40,000 per year after taxes. Sue is 37 years of age, and Tom is 35. Their two children, Mike and Karen are 13 and 11. Were either one to die, they estimate that

    asked by Jamie
  47. personal finance

    Donna and Sherman Terrel are preparing a budget for 2003. Donna is a systems analyst with an airplane manufacturer, and Sherman is working on a master's degree in educational psychology. The Terrels do not have any children or other dependents. Donna

    asked by Sami
  48. algebra

    Nine more than the sum of six minus a number and five equals twenty-one I am sorry I hit the wrong button and it sent it before i finished can some tell me if i have writen this problem right i think it goes 21=6-x+5+9 would this be they way i write it so

    asked by tom
  49. Biology

    What are code pieces of nucleic acids? (this is for a crossword puzzle and strangely polypeptides does not fit!) the spaces are: _ _ _ _ e _ _ _ _ _ _ What are the varients of a gene? (it's not diversity like I thought it should be) the spaces are _ i _ _

    asked by Lizzy
  50. RE: phhysics

    Posted by Charlene on Friday, March 23, 2007 at 3:00am. picture in your mind a block that slides without friction down a ramp that is inclined at an angle (q) above the horizontal. Initially the block is at rest a distance (s) in meters (measured along the

    asked by Charlene
  51. chemistry

    If the molecular weight of a protein is given as 90,000 are the units g/mol or simply g? I have seen mixed answers to this question. It will be 90,000 g/mol since 1 mol will have a mass of 90,000. But many simply drop the the mol and say the molecular

    asked by JC
  52. science

    oky i have to make a tornadod simulator but what can i make it out of http://www.facethewind.com/tornsim/tornsim.html has some good suggstions

    asked by cc