Questions Asked on
June 20, 2009

  1. chemistry

    what do you observe in the displacement reaction of zinc and lead nitrate? also, what is the symbol equation for this reaction?

    asked by Nabiha
  2. chemistry

    A mixture of hydrogen peroxide, H2O2, and hydrazine, N2H4, can be used as a rocket propellant. The reaction is: 7 H2O2(g) + N2H4(l) ® 2 HNO3(aq) + 8 H2O(l) a) How many moles of H2O2 react with 0.477 mol N2H4? [1] ___________ b) How many grams of HNO3 can

    asked by dan
  3. Organic chemistry

    compound with a molecular formula C8H16O has the following H-nmr spectrum: 3H triplet at 0.90, 1.0 to 1.6 8H multiplet, 2.05 3H singlet, 2.25 2H triplet. What is the structure of this compound? I think it is 2-octanone but not sure

    asked by jeff
  4. physics

    can you show me how to do this mathematically A car traveling 90 km/h is 100 m behind a truck traveling 75 km/h. How long will it take the car to reach the truck?

    asked by Physics
  5. University math grade 11 Trig

    A very tall light standard is swaying in an east-west direction in a strong wind. An observer notes that the time difference between the vertical position and the furthest point of sway was 2 seconds. The pole is 40 metres tall. At the furthest point of

    asked by Liza
  6. Chemistry

    If you add Na2CO3 and AgNO3 together in a test tube what exactly would you observe and what would be the equation for the equilibrium system? If you then add HNO3 to the solution what exactly would you observe and what would be the equation for that

    asked by Sylvia
  7. economics

    Explain this statement: the most unlikely problem of the national debt is that the government will go bankrupt.

    asked by Karry
  8. Math

    Use the substitution method to find solution sets (x,y) for the following systems of equations: 3x-5y=-11 6x+2y=26

    asked by Scott
  9. medical billing and coding from Penn Foster

    I am writing a research paper for HIPAA, I beleive I have most of the information to do the paper. I do not understand what it means by writing it in proper MLA/APA citation style? Could someone please explain this to me and show me a small example of what

    asked by Shannon
  10. mat115

    A rectangular picture window is 6 ft by 4 ft. Polly wants to put a trim molding around the window. How many feet of molding should she buy?

    asked by wayne
  11. chemistry

    what exactly would you observe and see at the end of the reaction of zinc and lead nitrate? include in formation about colour changes and bubbles. you can use the following equation to help; zinc+lead nitrate(arrow) zinc nitrate+lead

    asked by Nabiha
  12. chemistry

    A 10.0 mL sample of 3.00 M KOH(aq) is transferred to a 250.0 ml volumetric flask and diluted to the mark. It was found that 38.5 ml of this diluted solution was needed to react the stoichimetric point in a titration of 10.0 mL of a phosphoric acid, H3PO4,

    asked by dan
  13. chemistry

    does this sound right for what happens with the zinc and lead nitrate reaction? could i add anything else? The zinc displaces the lead. You can observe the lead preipitating on the zinc surface. The zinc changes to black crystals which dissolve in the

    asked by Nabiha
  14. Physics

    The last stage in the fusion of hydrogen to form helium in the Sun involves the formation of an alpha particle (4He) from two 3He nuclei: 3He + 3He 4He + p + p The binding energy for 3He is 2.57 MeV per nucleon and that for 4He is 7.07 MeV per nucleon.

    asked by Angie
  15. maths

    make the letter in the bracket the subject of the formulae: v=u-3t (t) a=b-4c (c)

    asked by Nabiha
  16. Physics

    You are told that the volume of a sphere is given by V=(sqrt)d^3/4, where V is the volume and d is the diameter of the sphere. Is this equation dimensionally correct?

    asked by Greg
  17. chemistry

    why does zinc and lead nitrate react?

    asked by Nabiha
  18. Physics

    Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 x 10^−3 ohms is in a region where there is a uniform magnetic field B. The field is at 30deg to the normal to the plane of the wire loop as shown in Figure 3.

    asked by charlie
  19. Math

    Name the property that justifies each step. [(2x100)+(3x10)]+[(1x100)+(5x10)] = (2x100)=[(3x10)+(1x100)]+(5x10) I think this is Commutative = (2x100)+[(1x100)+(3x10)]+(5x10) I think this is Distributive property =[(2x100)+(1x100)]+[(3x10)+(5x10)] I think

    asked by B.B.
  20. analysis and design

    5.2 Project Risks [Use this section to list at least five risks factors and their potential impacts for the project.] # Risk Area Likelihood Risk Owner Project Impact-Mitigation Plan 1 [Project Risk] [High/Medium/Low] [Replace this text with a description

    asked by Becky
  21. Phoenixuniversity

    How did you come up with answers to Comprehensive Grammar Checkpoint

    asked by Sara
  22. Literature Help quick question

    In the book you don't know me by david klass does anyone know what John's stepfather name was? I think it was Stan but I'm not sure.

    asked by Rita
  23. maths

    make v the subject of the formulae: v=2v+3u

    asked by Nabby
  24. physics

    the speed of a car can be measured in s^-1 m right... it could be said that a speed of a car the velocity was 15 s^-1 m which is perfectly acceptable... by definition 15 s^-1 m can also be written as 15 Hz m just by definition... what on earth does that

    asked by Physics
  25. Helth

    700 words paper evaluating the financial aspects of the Wic Program How do they fund their programs? o How reliable are their funding sources? o Do they implement financial accountability measures to ensure that funds are being used properly? o What

    asked by Fay
  26. math

    Show that any positive odd integer is of the form 6q+1, 6q+3 or 6q+5, where q is any positive integer

    asked by priya
  27. chemistry

    Long but quick chemistry lab that I need confirmation on answers if possible? OK so I have this lab that went pretty quick and smooth and I have an online assessment that I needed to put all my figures in. I am all complete but am having trouble with 3

    asked by Capacino
  28. Physics

    A racecar driver in an 825-kg car accelerates from rest to a velocity of 21.5 m/s in 0.55 s. What is the net force acting on the car? I found out using A=v/t that the horizontal acceleration is 39.1 m/s^2. My problem now is this... Is the net force just

    asked by Hannah
  29. analysis and design

    My project is upgrading a bathroom and this is what I need help with: Project Risk-list 5 factors and their potential impact for the project. Project Constaints-ex: triple constaints variable (cost,time/schedule and scope)are there any possible limitations

    asked by Becky
  30. Math

    What does relative to math?

    asked by Liza
  31. math

    b. A number is divisible by 8 if it is divisible by 4 and divisible by 2.

    asked by chandice
  32. Business

    Which government entities regulate the securities that Verizon issues?

    asked by Linda
  33. Business

    Which investment bank does Verizon use to issue stock?

    asked by Linda
  34. Business

    Which two lenders does Verizon use?

    asked by Angel
  35. math

    If a number is divisible by 4 and 6, it must be divisible by 24

    asked by chandice
  36. elementry math

    How do the ideas of divisibility and multiples relate to the study of fractions?

    asked by jessica
  37. Algebra

    Given that f(x) = x^2-3 and g(x) = 2x+1 find each of the following if it exists. (g/f) (-1/2)

    asked by Rachale
  38. lewis structure for molecules


    asked by ME
  39. re

    what is the miracle of Lourdes? is it about the young girl called Bernadette? thanks

    asked by niv
  40. Math

    Can someone help me with this problem? Evaluate the numerical expression on a calculator. Round the answer to the nearest whole number. ( 34*15) (364) -------- * ---- (5) (52) Here is what I figured: (510) (364) -------- * ----- (5) (52) = (185640) -------

    asked by B.B.
  41. Maths ...

    Hi Can anyone help with this little problem , I have to compare the percentage change for the following numbers from a graph (Tonnes) Comparing the lower years with the year 2050 Year 2050 = 14672.873 2046 = 14745.197 1990 = 6096.0 I have worked out the

    asked by Gary
  42. Algebra

    Please Help! Confused! I got an answer but it is not correct. Can someone help? Thanks! Given that f(x) = x^2 - 3 and g(x) = 2x + 1, find each of the following, if it exists. (gf) (-1/2)

    asked by Jen
  43. Physics

    when trying to find uncertanty percent error and your given the number - 15 s^-2 m with a implied uncertanty of +/- 1 s^-2 m and you try to find the percent uncertanty and you do this (- 15 s^2 m)^-1 1 s^-2 m (100 %) is the percent negative or positve also

    asked by Physics
  44. designs

    nice henna/mehndi designs....? didn't find any interesting ones on google

    asked by y912f
  45. math

    Show that any positive integer is of the form 4q, 4q+2, where q is any positive integer.

    asked by priya
  46. Algebra

    y = (1+x)/(1-x) How do I rearrange that equation to be: x = (y-1)/(y+1)

    asked by Sean
  47. english

    on an exam if you are given an essay to read & then do you do this Thanks

    asked by SCOTT
  48. health care

    Where do you think health care quality will be ten years from now?

    asked by april
  49. math

    The following conjectures were made by students. Which do you think are false? Give a counterexample for each conjecture if possible. a. Only half of the nonzero even numbers up to 100 are divisible by 4.

    asked by chandice
  50. math

    c. If 12 divides a number, 6 also divides the number.

    asked by chandice
  51. math

    A customer wants to make a teepee in his back yard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the teepee, and he wants the teepee to be 12 feet across and 8 feet tall. How long should the pieces of PVC plumbing pipe

    asked by Kay
  52. Sci275

    I am doing my final project on energy conservation.What are some good resources on energy conservation?

    asked by sam
  53. math115

    a sales person drove 238

    asked by Anonymous
  54. algebra

    what is the snswer to this sum a x 4 = d

    asked by Rosiebee