# Questions Asked onMay 7, 2008

1. ## Science

Rubbing alcohol is a solution of 70 percent alcohol and 30 percent water. In the alcohol solution, which is the solute and which is the solvent? Explain.

2. ## chemistry

I know how to use the equations pv=nrt and P1xV1/n1xT1 = P2xV2/n2xT2, but I don't understand when to use them. I have a test tomorrow and I'm going over some word problems, but I can't figure out how decide which formula you need to use. Is there a

3. ## physics

The nucleus of a copper atom contains 29 protons and has a radius of 4.8*10^-15m. How much work (in electron volts) is done by the electric force as a proton is brought from infinity, where it is at rest, to the "surface" of a copper nucleus? I really got

4. ## Social Studies/English

My social studies class is discussing the energy issues in the world today. I have to write an essay about an energy issue and include the two opposing sides viewpoints. The issue I would like to write about is the United States dependence on foreign oils.

5. ## chemistry

Explain in terms of molecular structure why sugars have a relatively high melting point compared to hydrocarbons of a similar size.

Let f(x)=9sinx/2sinx+4cosx. Then 'f(x)= ((2sinx+4cosx)(9cosx)-(9sinx)(2cosx-4sinx))/(2sinx+4cosx)^2. The equation of the tangent line to y=f(x) at a=2 can be written in the form y=mx+b where m= 9and b= ______.?????

7. ## quantum physics

After a .800-nm x-ray photon scatters from a free electron, the electron recoils with a speed equal to 1.20 x 10^6 m/s. (a) What was the Compton Shift in the photon's wavelength? (b) Through what angle was the photon scattered? I got an answer for (a), but

8. ## science

Would you expect the dissolved oxygen concentration of water samples taken from a lake at 7 am to be higher or lower than samples takn at 5 pm? I feel like there may be more dissolved oxygen in the sample taken at 7 am because photosynthesis probably took

9. ## math

Find the value of k such that the system of linear equations is inconsistent. {4x-8y = -3 {2x+ky = 16 I know that the answer is k = -4 but I don't know how to solve to get that answer.

10. ## Physics

Bulb P is rated 60 W, 110 V, and bulb Q is rated 100 W, and 110 V. Which of the bulbs has the higher resistance? they have the same cannot be determined bulb P bulb Q I had they have the same.

How do you do the simplified structural formula and full structural formula of ester? I'm really struggling,please help! e.g.methyl ethanoate/propyl methanoate

12. ## chemistry

If it requires 54.7mL of a 0.0765 M HCl solution to complete neutralize 25.0 mL of a KOH solution, what is the molarity of the KOH solution.?

13. ## Physics

170 students in a lecture hall can scream at 115 dB. Thus, we should expect that: A. an average student can do 0.68 dB by him or herself. B.340 average students can do 125 dB. C.340 average students can do 230 dB. D.1700 average students can do 125 dB.

14. ## grammar

Is fine arts program capitalized?

15. ## chemistry

A scuba tank is filled to 2500 psi(170 atm) in a dive shop at room temp/(25 degrees C) then stored in the trunk of a car on a hot day. What will be the new pressure in the tank if the temp. in the trunk reaches 60 degrees C? Express that pressure in

16. ## english

sorry it didn't post all the way With the way things are today, with business after business trying to outdo each other in performance, many businesses are now changing the way they look at things and are now trying to beat out their competition in a

17. ## Geography

A Day Without Farming? This is for Geography. I have to hand in one page talking about what a day without farming would be like. Any ideas? Does anyone feel like writting a bit? Any suggestions would be very appriciated. Thanks in advance! (Sorry, I just

18. ## INB

Effects of Economic and Socioeconomic Forces: Choose one newly industrializing countries mentioned in the text (p. 102 International Business) Choose a product you think would be suitable to export to the country you chose based solely on that country’s

19. ## Economics

Assume the demand for beef is given by Qd = 22 + 0.1 Y – 10Pb + 5 Pc And the supply of beef is given by: Qs = -400 + 500Pb – 200 Pf where Qd denotes quantity of beef demanded, Qs denotes quantity supplied, Pb denotes price, of beef, Y denotes per

20. ## Algebra 1

Your uncle buys a new car that comes with seven new tires, one for each wheel, and three spares. He decides to be economical by using the three spares as much as the other four. If he drives 22, 750 miles and each tire has been used equally, what will be

21. ## chemistry

a 36.o% Aqueous solution of sucrose has a density of 1.16g/mL.What mass of sucrose is in 500mL of this solution?

22. ## chemistry

Calculate the volume of a 9.00 M HNO3 stock solution that must be used to prepare 450 mL 0f a 1.80 M HNO3 solution.

23. ## chemistry

predict the pH of an aqueous solution that is 0.00378 molar in HBr

24. ## Chemistry

Hi there. I'm doing a paper on Biology (yes I know, will explain the chem link in a sec) and in it am trying to find the best pH level for Slaters, using limewater and filtered water to change concentrations. I have done experiments and using bunch of

25. ## chemistry

Calculate the molarity of a solution that is prepared by dissolving 23.35g of CaCl2 in a sufficient amount of water to make a 600 mL solution.

26. ## algebra

(4b+5c)(4c+3b)=

28. ## Literature

What are some sites- any sites- for the following books that I can look at: Rebecca by Daphne du Maurier, Fahrenheit 451 by Ray Bradbury, and Lord of the Flies by William Golding? Besides Sparknotes and PinkMonkey)

29. ## Psychology

Change your thinking(Title of my reseach paper) How do I plan to support my thesis with compelling arguments and counterarguments. My thesis statement is," Even though we experince situation that demonstrate this simple principle- the way we think

30. ## chemistry

what is the balanced chemical equation for aqueous hydrgoen peroxide to produce solid lead (II) sulfate and liquid water?

31. ## Math

30y = x^2 - 14x + 13 FOR X

32. ## Physics

For the medium to remain undisturbed as two pulses pass the same point, they must have equal amplitudes opposite amplitudes different amplitudes both a and b I had both a and b but im not sure.

33. ## chemistry

Assuming the volume of the connecting tubes is negligible, what will be the pressure in the apparatus after all of the stopcocks are opened and the gases are allowed to mix?

34. ## FRENCH

If I would like to say: "Is your brother at home?" would it be correct to say: est-il à la maison, votre frère? or votre frère, est-il à la maison? Are your children in school" Sont-ils à l'école, vos enfants? Thank you

35. ## science

what is the science?

36. ## Math (Calculus)

y= x^(2x+1) find the derivative of the function using natural log

37. ## french

Today we learnt about negative of quelque chose. 1) J'ai entendu quelque chose. = Je n'ai rien entendu. 2) J'ai pense (passe compose) a (accent grave) tout. =Je n'ai pense a rien. Why is that in 1) rien is infront of the verb, and 2) is after the verb? How

38. ## Physics

What is the nature of an image formed by a concave mirror of focal length 10 cm for a real object placed 3 cm from the mirror real and inverted real and upright virtual and inverted virtual and upright Would it be virtual and inverted, I do not believe

39. ## Sense and Sensibility

How do Marianne and Elinor compare and contrast?

40. ## science and politics

Should affected nations from global warming , be legally entitled to financial assistance from those who did cause them and who have benefied from them? explain if they should or shouldnt contribute

41. ## algebra

ok im feeling really dumb but TWO LINES intersect making 121 degree angle. other angles measure?

42. ## algebra

ok this is really hard i have a crossword puzzle 3Y-9 Y=19 also They want to know what N stands for in this question the mean is 14. the data is N, 16,16,and 18. Last probability of 7 out of 20=N%

43. ## DUE AT MIDNIGHT: HELP ME!!

If the process of ion attraction within the nephron is not functioning properly what would you expect to find in the blood and urine?

44. ## basic english

What mark of punctuation is most closely associated with interjections

45. ## English

What are 3 examples of rhyme schemes? My assignment was to get 5 and I got only 1. Can you give me 3 more? Here's one of the poems I have: To Anthea, Who May Command Him Any Thing Robert Herrick Bid me to weep, and I will weep, A While I have eyes to see;

46. ## For Brandon

I replied to your answer, do you have any feedback for me? Thanks

47. ## Computers

How do you put sound and to make it play throughout a powerpoint presentation?

48. ## chemistry

Describe the role of each of the following types of bonds in a polyamide: a) covalent bonds

49. ## CHEMISTRY HELP

IF ANYONE CAN HELP ME WITH MY HOMEWORK AND EXPLAIN EXACTLY HOW TO GET THE ANSWERSSS PLEASEEE HELP

50. ## chemistry

What types of linkage joins the nucleotides a) within a single DNA strand and b) between two single DNA strands?

51. ## MATH HELP!

HELP! I REALLY NEED HELP IN BASIC SKILLS MATH! Can you please find me a GOOD web site that will help me in random basic skills math?

52. ## health care

describe at least two roles of medical staff and two roles of hospital administration that you consider most important.

53. ## Social Studies

What is Cultural Diversity and why is Cultural Diversity necessary in the first place?

54. ## english

i need to know if my paper is in order and is grammatically correct. Symbolism, 1the use of symbols to invest things with a representative meaning or to represent something abstract by something concrete, is used in novels and stories by authors worldwide.

55. ## english

With the way things are today, with business after business trying to outdo each other in performance, many businesses are now changing the way they look at things and are now trying to beat out their competition in a different way, reputation. With a

56. ## social studies

what was the role of the U.S. in emerging global community

57. ## math-any thoughts?

Not trying to bug anybody, but does anybody have any help they could give me with my 2 questions from yesterday? I'm really confused, so I'd appreciate ANY input. I've tried looking at math help websites and read all the definitions, but I'm just not

58. ## algebra

for the nonlinear equation f(x)=4x+4 x=2 x=4 is it correct to say that two inputs would be 12,20. If not could you help me with two inputs? Thank you

59. ## a really quick question over commas

I was nervous to see who would be in my classes and what my teachers would be like, but after the day had gone by I had a feeling that it would be a great year. MY QUESTION: Would there be a comma after "by" or after "but"?

60. ## Science

What is the difference between a bottle of water and a bottle of hydrgen and oxygen gas?

61. ## HELP

ok this is really hard i have a crossword puzzle 3Y-9 Y=19 also They want to know what N stands for in this question the mean is 14. the data is N, 16,16,and 18. Last probability of 7 out of 20=N%

62. ## Science

The density of water is one gram per cubic cenitimeter. What is density of water in pounds per liter?

63. ## science

what is a layer of organicsediment??

64. ## Math

Right now i'm doing this kinda cool (kinda) project. I need to find the price of all my supplies when i'm building something. So ummm yah. I need to know the pice of nails...you know not a finger nail but a nail that you use a hammer. I don't know how much

66. ## chemistry

Calculate the molarity of a solution that is prepared by dissolving 23.35g of CaCl2 in a sufficient amount of water to make a 600 mL solution

67. ## Math

how do you do this?? -4x-7=-2(x+3)

68. ## Calculus

I have a problem about complex number. Let z=7e^(7*pi*i/4) . Write z, z^4, z^7, z^(-2) in the form a + b i I have no idea how to do it. Any hints will be appreciated.

69. ## chemistry

what is the pH of an aqeuous solution with s hydroxide ion[OH-] concentration of 7.5x10-10 M?

70. ## chemistry

a pH meter gives a readout of 9.35 when the probe is dipped into an aqueous solution containing the strong base NaOH. What is the molarity of this solution with the respect to sodium hydroxide?

71. ## Anthropology

Create at least two arguments each pro- and contra the establishment of a Global Culture does any one know about global culture or what it is

m - 1 2/3 < 1

73. ## chemistry

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

74. ## math

write each number is two other forms 10+4+0.05

75. ## math

Why does 0!=1

76. ## chemistry

There is an apparatus that consistsw of three glass bulbs connected by small glass tubes with the stopcocks closed. Given that the temp. is 27 degrees C, what is the pressure of a gas in each glass bulb? 1L=1.79g CO2 2L=0.162g H2 3L=4.87g Ar

77. ## IB Algebra

okay. so i don't know how to do the square root things. so this is going to be my square root sign: ^ Multiply:x ^7 ^14 ---x--- ^2 ^27 if you couls help i would be very greatful!

78. ## history

Who was Minnesotas first school teacher

79. ## English

What are some modern day applications to utopian and dystopian society?

80. ## ecology

what is the role of prouducers in a ecosystem

81. ## calculus

solve the following differential equation: y' + (y)tanh(x) - 2e^x = 0

82. ## math

Steve was charged \$60.00 interest for 1 month on a \$3,000 credit card balance. What was the monthly interest rate?

83. ## Physics

For incomplete cancellation to occur, opposite pulses must have equal amplitudes different energies equal pulses equal displacements it seems like none of these are quite right but would different energies be the closest.

84. ## english

what are the branches of english

85. ## another comma question

It seemed like just the other day I was only beginning high school and now it’s coming to an end. Would there be a comma before and?

86. ## math

calculate (x-3)(x+2)

87. ## DUE AT MIDNIGHT: HELP ME!!

If the process of ion attraction within the nephron is not functioning properly what would you expect to find in the blood and urine?

88. ## Sense and Sensibility

What are good sites besides Sparknotes and Pink Monkey for this book?

89. ## arithmetic

how many three-digit integers greater than 500 contain only odd digits

90. ## pre-algebra

ok Relation between two quantities expressed as the quotient of one divided by the other? please help this is puzzling

91. ## music

ok what could be another way to state the dynamics what else could you call it in one word that's acctually a word. please and thank-you

i can help

94. ## algebra

Quartics using P(X) = af(b(x-c)+d Recall Q(X) = (x-2)(x-1)(x+1)(x+2) a)Choosing a (i) Rewrite Q(x) for a. Let b = 1, c = 0 and d = 0 (ii) Make 3 copies of the same function on your calculator Let a= -1, 1 and 2 Your equations are Y1= __________(a=-1) Y2=

95. ## algebra

Suggest a cubic that would best approximate a sine wave (f(x) = sin(x)) over the interval 0 less than or equal to x less than or equal to 2pi

96. ## algebra

Suggest a cubic that would best approximate a sine wave (f(x) = sin(x)) over the interval 0 less than or equal to x less than or equal to 2pi (i) What intervals would you be concerned with. What amplitude would you be working with (ii)Find a cubic that

97. ## music

when was the Davul drum invented?

98. ## SCIENCE

WHAT IMPORTANT OBSERVATIONS DID DARWIN MAKE ON HIS VOYAGE?

99. ## Source Analysis

I have an upcoming source analysis for my mid year exam in Ancient History, and after my past few source anaylsis', I haven't had of the greatess success. If there any websites or guides that could help me anaylse sources, such as sections of text and

100. ## Math

Write the function f(x)= 2x^2-4x+7 in standard form, then identify the vertex and the equation for the axis of symmetry.

101. ## ALGEBRA

How do you determine if a polynomial is the differnce of two squares.

102. ## social studies

after the first battle of bull run president lincoln appointed george mcclellan to lead the union army of the east

104. ## science

What do altruism and kin selection have to do with natural selection?