Questions Asked on
May 29, 2007

  1. Chemistry

    I have a few question about an equilibrium lab we performed. Approximately .1 g of CoCl2 * 6H2O was mixed with 2 mL of 12 M HCl. The solution turned blue. Then, water was added and stirred into the solution in 2 mL incriments until no further color change

    asked by Kim
  2. Calculus

    R=M^2(c/2-m/3) dR/dM=CM-M^2 I found the derivative. Now how would I find the vale of M that maximize the derivative dR/dM? set it to zero, and solve for m. You get two solutions. Use the second derivative to see which one is the max. I get M=C. How do I go

    asked by Anonymous
  3. Chem--- last lab question!!

    My lab partner performed one section of a lab on her own while I worked on something else. This section involved first adding a drop of 6 M NaOH to Zn(NO3)2. A precipitate forms. This is repeated in three separate test tubes. In each test tube, a different

    asked by Kim
  4. CHEM

    a mixture of 10cm3 of methane and 10cm3 of enthane was sparked with an excess of oxygen. after coolin to room temp, the residual gas was passed through aq KOH. what volume of gas was absorbed by the alkali ? Write the equations for CH4 + O2 and C2H6 + O2.

    asked by Pet
  5. physics

    An explosion breaks an object into two pieces, one of which has 3.20 times the mass of the other. If 8000 J were released in the explosion, how much kinetic energy did each piece acquire? I started with using KE = (1/2)mv^2 and m1v1 = m2v2. Then

    asked by micole
  6. Statistics

    In one study of smokers who tried to quit smoking with nicotine patch therapy, 39 were smoking one year after the treatment, and 32 were not smoking one year after the treatment. Use a 0.10 significance level to test the claim that among the smokers who

    asked by Veronica
  7. physics

    A box is cubical with sides of proper lengths L1=L2=L3=2.0m when viewed in it own rest frame. If this block moves parallel to one of its edges with a speed of 0.80c past an observer, (a) What shape does it appear to have to this observer, and (b) What is

    asked by beth
  8. Econ

    Pat takes 4 hours to brew 5 L of beer and 2 hours to make a pizza. Kris takes 6 hours to brew 5 L of beer and 4 hours to make a pizza. What is Pat and Kris's opportunity cost of making a pizza? Think the problem through, then take a shot. The opportunity

    asked by Jen
  9. GCSE Maths - Probability

    First the denominator. There are 8*7*6*5*4*3*2*1 = 40320 ways the 8 friends could be seated. Now the numerator: There a 6 possible seats for Trevor (he cant have an end seat). For each of these 6 seats, the two brothers could be seated in 2 ways. (A on the

    asked by economyst
  10. temperature change

    What is the temperature change when 9.8 g of KNO3( with 34.9 kJ/mol enthaply of solution) is dissolved in 150 g of water? Assume that the specific heat capacity is 4.18 J/K*g. Answer in celcius. So far I have the Q= ^T*m*s but i don't know what numbers go

    asked by ty
  11. physics

    A friend in a spaceship travels past you at a high speed. He tells you that his ship is 20m long and that the identical ship you are sitting in is 19m long. According to your observations, (a) how long is your ship?? (B) how long is his ship?? (c) what is

    asked by beth
  12. algebra

    write (27a^-3)^(-2/3) in simplest form. solve log(6x+11)=2 please and thanks I am not going to give you the answers. I will be happy to critique your work. In the first, remember that (a^b)^c= a^bc I am not looking for the answers. And I told you: I'm not

    asked by Lillian
  13. science (heeeeelp)

    Heloooo? can somebody plz answer my questions below? I need help! You'll learn far more if you research the questions and their answers yourself. We don't give answers on this forum. If you want to post your own answers, we'll be glad to critique them.

    asked by marina
  14. International business

    You are the chief executive officer of a multinational’s subsidiary in a developing host country. The subsidiary has been in business for about eight years, making electric motors for the host country’s domestic market, with mediocre financial results.

    asked by Tracy
  15. Government

    Why does the Constitution all the Federal Government to levy taxes? Please don't post under multiple names. It's not necessary. Be sure to read Article I, Section 8, of the US

    asked by Jack
  16. econ

    Frank's nominal income in 1998 is $45,000. Suppose the CPI in 1998 is 150. What is Frank's real income? a. $51,750 b. $45,000 c. $38,250 d. $30,000 can you show me the calculations real income in what year's dollars. Real income in the base year of the cpi

    asked by Jen
  17. Science check

    I was wondering if someone could check the problems for me? Thanks I can go back and show work if needed..this was just easier to type out. 1)An object has a mass of 615 grams and a volume of 105cm3.What is the density of the object? answer 5.86 gm/cm3 2)

    asked by Anonymous
  18. chemistry...weird question

    on heatin, 0.02mol of the element M reacts with 0.025mol of oxygen gas. What is the empirical formula of the oxide of M? The mole ratio is .025/.02=1.25 or 5/4 So the O2 has a ratio of 5 to one Metal. M4 (O2)5= M>sub>4O10 or writing it in lowest whole

    asked by Cynthia
  19. chem(freezing point)

    please help! I am lost! Question: Find the expected freezing point of a water solution that contains 286g of aluminum nitrate (Al(NO3)3) in 8.5 kg of water. answer in celcius Note the correct spelling of Celsius. delta T = i*Kf*m Determine the molality of

    asked by Anonymous
  20. chem

    Calculate [H+] in 0.375M H2PO4 Ka=6.2x10^-8 I know I'm suppose to write the equation first, but I'm not sure if I did it right: H2PO4 + H2O 2H+ + PO4 is that right? You need to clarify the question. Is that a salt, such as KH2PO4, that is 0.375 M or is it

    asked by Amanda
  21. Algebra

    If I am given a table of numbers, how do I determine what type of funcy=tion it is? You can plot it to see if you recognize some typical shape. There are different strategies possible to find the function... Do you need to find an exact expression for the

    asked by Alyssa
  22. history

    I have a History project, and I have to ask a person questions emigrating from their country to America. Can someone give me websites that have questions to ask? Thank you for using the Jiskha Homework Help Forum. Just take the interrogative/question words

    asked by ben
  23. Calculus II

    Here's the problem: Find the area of a plane region bounded by y=x^3 and its tangent line through (1,1). So far I have the graph on my graphing calc, so I have an idea at what I'm looking at. I found the tangent line to y=x^3 to be y=3x-2. Now I am stuck.

    asked by Ace
  24. Solving Equations with Rational Expressions

    Can someone please show me how to solve these for me? 5/(y-2)=y+2 (x/3)-(2/3)=(1/y-5) (y+2)/7=1(y-5) (x^2)/(x-4)-7/(x-4)=0 x^2/(x+3)-5/(x+3)=0 I assume that your second equation has y as a typo. I will use that as an example. (x/3)-(2/3)=(1/x-5) Multiply

    asked by Mike
  25. English

    I have to do a report my tomorrow on Robert Mugabe. I have alot of info from wikipedia, but the paper is still somewhat broken up, and i don't really understand why he is a dictator or what he did. ANy help?

    asked by Shaila
  26. Government

    What are some of the reasons as to why the President is given almost unlimited military powers Article I, Section 2

    asked by Sofia
  27. math

    The admission fee to a video game arcade is $2.00 per person, and it costs $0.50 for each game played. Shelli and Veronica have a total of $20.00 to spend. What is the greatest number of games they will be able to play? 20.00 -4.00 (admission for two

    asked by Christian
  28. algebra II,math

    this is another from a different section can you show me how to solve it. An electronics company produces three models of stereo speakers, models A, B, and C, and can deliver them by truck, van, or station wagon. A truck holds 2 boxes of model A, 2 of

    asked by mathstudent05
  29. physiology help

    why do fetal pigs have sensory papillae for bitter taste on the tongue? i have no idea. maybe so they won't eat something bad? Since this is not my area of expertise, I searched Google under the key words "bitter taste function" to get these possible

    asked by dave
  30. Science

    If barium ions (Ca^2) have a charge of 2 + and hydroxide ions (C1^1) have a charge of 1-, the compound calcium chloride is? a)Ca2C1 b)CaC1 c)CaC12 d)Ca2C12 Those are "ells" and not "1s". What's with the barium ions (Ca^2) and hydroxide ions (Cl^1)? Ba ions

    asked by Anonymous
  31. clauses or not

    Can someone help me plzzz?!?!?!?!?! Here are some sentences that I have to identify as clauses or not. Notice I have put the words that I have to identify in (): 1. The wide variety of rocks (can make them an interesting subject for study.) not a claus 2.

    asked by Holly = )
  32. Chemistry

    As a substance goes from a solid to a liquid, the particles move further apart? duh For many substances, yes. It depends on the density of the solid/liquid. What does happen, is that in solids atoms are mostly bound in a crystal arrangement, and not free

    asked by Katie
  33. chem

    no idea how to do this! Please help! Determine the freezing point of a water solution of fructose( C6H12O6) made by dissolving 59.0 g of fructose in 485g of water. Answer in celcius. Same method outlined for your other post. Post any work if you get stuck.

    asked by Anonymous
  34. math

    whatsz 4(x+5.1)-5x It is an algebraic expression.

    asked by alaina
  35. english

    what is the importance of irony in life and/or in realistic fiction? In realistic fiction it definitely adds an element of surprise. It keeps the reader guessing and it makes the book more interesting because the readers thinks something is going to happen

    asked by ashley
  36. history

    I need to interview someone who was born before 1970 and live in the United States during the eighties. Here are some questions. Who were some of the national heroes of the 80s? What do you remember about the Iran-Contra Affair? Please comment on the

    asked by Anonymous
  37. Math/Calculus

    How would I integrate the following: (2x^2 + 5)/((x^2+1)(x^2+4))dx I think I would start with making it a sum of two partial fractions.

    asked by COFFEE
  38. inequity question

    Can someone show me how to solve the inequality below? -5(x + 4) > 3(x - 4) To solve, treat it as you would an equation. First, multiply each side out, then get the numerical terms on one side and the x terms on the other. I hope this helps. Thanks for

    asked by Christian
  39. English

    Punctuating Sentences The goose bit the mailman on the leg. Your answer: 1. no change good ~~~~~~~~~~~~~~~~~~~ Punctuating Sentences With five gallons of gas. Your answer: 2.With five gallons of gas, the car will not run for long. good ~~~~~~~~~~~~~~~~~~~~

    asked by Writeacher
  40. Mathematics

    Please help... In a 200 m swimming race between 8 boys, the probability of Omar winning the race if he is in one of the two outside lanes is 1/4. If he is in any of the other lanes, the probability of Omar winning is 1/3. If the lanes are drawn at random,

    asked by Elizabeth
  41. algebra

    did I do this right and if not can you please help me. Solve. 4(x + 7) = –8 4(x+7= -8 7*4+x *4= -8 (28+4x)= -8 28+4x= -8 28=-28+4x+ -8+-28 0+4x= -8+-28 4x= -8+ -28 4x= -36 4x÷ -36 x= -9 4x +28 = -8 4x = -36 x = -9 yep thank you why are you saying thank

    asked by jean
  42. algebra II , math

    okay heres one of the ones i need help on can someone explain it to me thanks. Solve each system of equations. Let "z" be the parameter. x +2y +3z =11 2x -y + z = 2

    asked by mathstudent05
  43. math

    can someone solve this h/2 > 12 Treat the inequality just like an equation and solve. I hope this helps. Thanks for asking.

    asked by mike
  44. Science

    Why are salts, such as sodium chloride made of elements found on opposite ends of the periodic table? a. elements on the far left tend to form positive ions while those on the right tend to form negative ions. b. elements on opposite ends of the periodic

    asked by Anonymous
  45. chemistry

    write the formula for potassium chloride. KCl thanx, but i gave you the wrong one. we're studying acids and bases, and so it's actually hypobromous acid. HBrO

    asked by beth
  46. Information on Cambodia

    Hey everyone, At the advice of the Grand Abbot of the Buddhist monestary I have been studying at, I am considering a trip to Cambodia this summer to study under the renown Buddhist teacher Sidhu-Darmya Parakesh. The Grand Abbot believes that Mr. Parakesh

    asked by Tyler
  47. Math

    In the Doubles Game, students can win carnival tickets to spend on games and food. A player pays one ticket to roll two number cubes(six-sided dice). If the numbers match, the player wins five tickets. If a player plays this game 20 times, about how many

    asked by Nicole
  48. History

    Describe a major result of the Civil War on the US. Was the result good or bad for the country? from Lots of results to choose from. Be

    asked by Brandy
  49. Adding and Subtracting Rational Expressions

    Can someone PLEASE show me how to solve these?I never could understand these types of equetions.(3x/10)+(9x/10) (n-2/n+4)+(8/[n+4]) (5m+8/[m-1]) - (m-3/[m-1]) (x^2/[x-1]) - (1/[x-1]) (4x+y/[2x+3y])-(2x -2y/[2x+3y]) (x^2+3x+2/[x^2-16] + (3x++6/[x^2-16])

    asked by Mike
  50. math

    NetBusters has a $30 sign-up fee plus $1.25 per video BlockFlix has a $10 sign-up fee plus $2.25 per video How do I set up a function rule equation I assume that you want to find out how many videos you have to buy before they become equal. Consider this:

    asked by Joe
  51. math

    can someone solve these for me? -3x - 9 > 12 4 - x >= -10 x + 3/4 >= 1/2 -2x > 10 To solve, treat inequalities just as you would equations. For example, -2x>10 -2x/-2>10/-2 x>-5 I hope this helps. Thanks for asking.

    asked by mike
  52. science

    i need help with the essay part of my exams so if you would answer any of these questions for me id be glad to study them, knowing ill get them right. *explain how parasites are different from scavengers.give an example each. *how would seasons on earth be

    asked by marina

    r^2+8r=48 First bring the 48 to the other side of the equation r^2+8r-48=0 Now you can use the quadratic formula. x=-b+-sqrt(b^2-(4ac)) ¯¯¯¯¯¯¯2a¯¯¯¯¯¯¯¯¯ So... a=1 b=8 c=-48 Now just plug the numbers into the quadratic equation and get

    asked by JOHN
  54. algebra

    List the like terms in the following group of terms. –7u, 4tu2, 4t2u, –5tu2, 7tu2, 6t2 did I do this correct? (4tu² + 7tu² + -5tu²) + 4t²u +6t² +-7u

    asked by jean


    asked by margie