Questions Asked on
October 20, 2007

  1. Chemistry

    A hydrated MgSO4 salt, weighing 3.211g, is heated in a crucible until reaching a constant weight. The weight of the anhydrous MgSO4 is 1.570 grams. 1. Calculate the moles of H20 removed and the moles of anhydrous MgSO4 remaining in the crucible. 2. What is

    asked by Marty
  2. Chemistry

    The isotopes of argon have the following relative abundances: Ar-36 0.34% Ar-38 0.06% Ar-40 99.66% Estimate the average atomic mass of argon. How would I go about doing this?

    asked by Marty
  3. chemistry

    What is the lewis dot structure for Fluoride, F1- and Mg2???

    asked by lucy
  4. Chemistry

    A closed container is filled with oxygen. The pressure in the container is 435kPa . What is the pressure in millimeters of mercury? (i know that 1atm=760mm Hg=101,325 Pa) How do I use this to solve for the question? so: 435kPa*101,325=44,076,375Pa, & O2 =

    asked by leo
  5. Chemistry

    How many atoms of C are contained in 45.6g of C6H6?

    asked by Marty
  6. chemistry

    Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s) + 3H2SO4(aq) -> Al2(SO4)3(aq) + 3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 15.9g . A)What minimum mass of H2SO4 (in g) would you need?

    asked by leo
  7. Manage Econ

    What are the advantages and disadvantages of "Open Market Operations" controlled by U.S. central bank?

    asked by Sharp
  8. History

    What aspects of european society did the church dominate from 1100 to 1300?

    asked by Joshua
  9. chemistry

    For each of the following acid-base reactions, calculate the mass (in grams) of each acid necessary to completely react with and neutralize 3.60g of the base. 2HNO_3(aq) + Ca(OH)2(aq) -> 2H_2O(l) + Ca(NO_3)2(aq) H_2SO_4(aq) + 2KOH(aq) -> 2H_2O(l) +

    asked by leo
  10. Business

    What are the advantages and disadvantage of minimax regret criterion?

    asked by justin
  11. History

    Was pope gregory justified in excommunicating Henry? explain?

    asked by Joshua
  12. Physic please check

    A person stands 4.2 m in front of a wall that is covered floor-to-ceiling with a plane mirror. His eyes are 1.9 m above the floor. He holds a flashlight between his feet and manages to point it at the mirror. At what angle of incidence must the light

    asked by Mary
  13. Chemistry

    What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer as shown in the picture? The atmospheric pressure is 0.95atm. l----l | (G) l | l - --- l Hg l Hg *18cm - - --- Hg Hg HgHgHgHg what

    asked by leo
  14. Chemistry

    Convert each quantity to an amount in moles: a) 4.27 x 10^21 atoms of He b) 7.39 x 10^23 molecules of ICl

    asked by Marty
  15. chemistry

    Aluminum reacts with sulfuric acid, which is the acid in automobile batteries. If 20.0 grams of Al is placed into a solution containing 115 grams of H2SO4, how many grams of hydrogen gas could be produced? Please help--I do not know how to set this one up.

    asked by lucy
  16. Chemistry

    Express each quantity as a mass in grams. a) 3.70mol of H2O b) 8.43 x 10^23 molecules of PbO2

    asked by Marty
  17. macro

    I need help with this question and am a student here. Can you PLEASE show me how to do this?? QUESTION Consider an economy described by the following equations: Y=C+I+G Y=500 G=1,000 T=1,000 C=250+0.75(Y-T) I=1,000-50r a.In this economy, compute private

    asked by greg
  18. science-reasoning

    light travells in a straight line at a constant speed of 300,000 km/sec. what is the light's acceleration?

    asked by Drew
  19. science-reasoning

    in 5 seconds, a car moving in a straight line increases it's speed from 50km/h to 65km/h, while a truck goes from rest to 15km/h in a straight line. which undergoes greater acceleration? what is the acceleration of each vehicle?

    asked by Drew
  20. Algebra-check my answers

    can you check my answers please? Find the zeros for the polynomial function and give the multiplicity for each zero. State whether the graph crosses the x-axis or touches the x-axis and turns around, at each zero. f(x) = 2(x - 2)(x + 4)^4 2, multiplicity

    asked by Tyra
  21. science

    how do you draw C2H6 as chemical structure?

    asked by Megan
  22. Music

    I want to make a song with the theme of "Planet Earth", although I'm not good at singing, so I'm just looking for a beat song. Can anyone of you suggest a genre or what instruments should I use?

    asked by Wenmar
  23. AP US

    What was Jackson's view of the presidency?

    asked by Ciara
  24. Lit

    Using only Stephen Crane's novel, the Red Badge of Courage, explain how he felt about war. Didn't he like it because it was glorious and it made boys turn into men?

    asked by Mariah
  25. grammar

    Grammar Exercise 4 To Be Distributed to Students in Week Seven Rewrite the following sentences, focusing on the grammar area specified in the left column. To enter your answer, click next to the number and begin typing. If the sentence is already correct,

    asked by bill
  26. Econ

    Explain advantages/disadvantages of "The Discount Rate" offered by U.S. central bank?

    asked by Ant
  27. French

    What is the difference between premier and premiere? Is it depend on masculine and feminine of the noun? How about deuxieme, is there a difference between masculine and feminine?

    asked by Miche
  28. calculus

    dy/dx= (2x-2xy)/(x^2+2y) Find all points on the curve where x=2. Show there is a horizontal tangent to the curve at one of those points.

    asked by sara
  29. math

    Ive got this equation system {x+y= 0 {x^2 + y^2 = sqrt(125) how do I solve it

    asked by lalith
  30. Graphing polynomial functions

    How do i graph the polynomial function of: f(x)= (x+3)(x+1)(x-2) squared

    asked by eric
  31. 7th science

    What is the mass of an object if the volume is 10 mL, and the density is 20g/mL^3? Is it 200 g?

    asked by Logan
  32. Physics

    i need help with a very VERY long problem. its about speed and distance. will post question when someone is interested to help! :]

    asked by Deborah
  33. science- reasoning

    why is it that an object can accelerate while travelling at constant speed but not at constant velocity?

    asked by Drew
  34. Bible

    I have to do an oral presentation on: Martyrs: Father Teodoro Santo Mejia & Father Victor Acuna Cardenas, Peru. I can not find any info anywhere on these people. Can anyone help???

    asked by Michael
  35. power point

    i am doing a bio on walt disney and am making a power point presentation. i am new to P.P., and i need some help. how can i get borders for my pages? how can i get a fun mickey mouse/ disney font?

    asked by anonymous
  36. English

    Every word in a poem is supposed to have meaning, but what does Chelsea, Massachusetts have to do with the poem? I know the word "liberty" has connotations with freedom, the statue of liberty, etc...the latin culture is having to sell their dreams to make

    asked by Debra
  37. science

    a 12V , 3A motor takes 120 minutes to do a certain job. a 120V, 8A motor takes 5 minutes to do the same job. Which motor uses the least energy and by how much?

    asked by Anonymous
  38. human services

    what would be the definition for the words problem, policy, and programs for health and human services? would you say problems.. what a person is going through? policy.. being what the agency has to follow such as guidelines and programs... things the

    asked by alley
  39. math

    If sqrt(x/y)+sqrt(y/x)=6, find dy/dx?

    asked by aksha
  40. History

    What is excommunication? what role did it play in the struggle between popes and kings?

    asked by Joshua
  41. science

    Molecules would move the fastest when A.the temperature is increased B.the molecule is bigger C.the energy is decreased d.the temperature is decreased

    asked by Cierra
  42. Graphing polynomial functions

    Given f(x)= 4x^2=9x+2 and g(x)=3x-2, find and simplify the following: (f+g)(x) (fg)(x) (f-g)(3) I have a few other problems i need help with too so if you want to lend me a hand let me know.

    asked by eric
  43. History

    What was the function of the egyptian funerary complex?

    asked by Lance
  44. English

    In writing a fictional story, is first person me, myself, I? what other first person words can we use for the story?

    asked by Trish
  45. History

    How does the hierachy of the catholic church compare to the hierachy of feudal society in western europe?

    asked by Joshua
  46. social studies

    How did imperialism affect both the colony and the colonizer? if u know the site where the answer can be found plz list it here cause i have to right a 5 paragraph eassy about this. thank you

    asked by roy
  47. Greek Literature

    In which work did Aegisthus kill Atreus? I think it's "House of Atreus" by Aeschylus but I'm not sure exactly what that is. Is it part of Oresteia??

    asked by Anon
  48. African History

    I need help analyzing the atlantic slavetrade.

    asked by Key-Key
  49. childcare

    how multicultural language effects society and peoples daily lives?

    asked by sadi
  50. social studies

    Why is the loyalist mad at the patriots?

    asked by Natalie
  51. math

    Hi, I need help finding a data of women's pay over the year. Is there a website you could point me to? THanks!

    asked by kelly
  52. science

    Which of the following is a compound? a.Nylon b.Hydrogen c.Iron d.Air

    asked by Cierra
  53. English (very simple)

    What are some phrases similar to "Case in point"? Thank you very much.

    asked by Jacob
  54. math

    how do you find someone height

    asked by nagalie smith
  55. math

    how do you find a percent like 19 out of 50 people like dogs

    asked by christina
  56. math

    ok does any one know how to find degrees

    asked by thomas
  57. math

    hey how are you gonna find the degrees like lets see 24%

    asked by jimmy
  58. communication

    Identifying key information within articles:

    asked by neenee01