# Questions Asked onMarch 30, 2008

1. ## Chemistry

solution of hydrogen peroxide, H2O2 , is titrated with potassium permanganate, KMnO4 , according to the following equation: 5 H2O2 + 2 KMnO4+ 3H2SO4 -> 5O2 + 2 MnSO4 +8H2O + K2SO4 It requires 46.9mL of 0.145 mol/L KMnO4 to titrate 50.0 mL of the solution

2. ## Chemistry

A solution of hydrogen peroxide, H2O2 , is titrated with potassium permanganate, KMnO4 , according to the following equation: 5 H2O2 + 2 KMnO4+ 3H2SO4 -> 5O2 + 2 MnSO4 +8H2O + K2SO4 It requires 46.9mL of 0.145 mol/L KMnO4 to titrate 50.0 mL of the solution

3. ## physics

A child looks at his reflection in a spherical tree ornament 12.0 cm in diameter, and sees an image of his face that us reduced by one-fourth. How far is his face from the ornament?

4. ## Chem

For the reaction, 3C2H2(g) ===> C6H6 at 25°C, the standard enthalpy change is -631 kJ and the standard entropy change is -430 J/K, Calculate the standard free energy change (in kJ) at 25°C. What is the formula that relates stand. entropy, enthalpy and

5. ## Chem

The brown color associated with photochemical smog is due to NO2(g). This is involved with the following equilibrium in the atmosphere: 2 NO2(g) N2O4. Predict the signs of the enthalpy and entropy changes for this reaction. If the equation is at

6. ## Physics - Mirrors & Lenses

When standing 1.25 m in front of an amusement park mirror, you notice that your image is three times taller. What is the radius of curvature of the mirror?

7. ## Calculus

For 0 < x < PI/2, if y = sin(x)^x, then dy/dx is.. I understand that you can take the natural logarithm of both sides and then take the derivative but why can't I simply take the derivative of it and get.. dy/dx = x(cos(x))(sin(x))^(x-1). Thanks in advance

8. ## HCA 220

What are the coronal plane and body directions

9. ## Chemistry

Urea, NH2CONH2, is manufactured from ammonia and carbon dioxide according to the following equation: 2 NH3 (g) + CO2 (g) -> NH2CONH2(aq)+ H2O (l) What volume of ammonia gas at 25 o C and 1.5 atm is needed to make 500g of urea?

10. ## Philosophy

1. Determine whether the following arguments are valid or invalid. If valid determine whether they are sound. Be sure to explain what validity is and how you determine whether an argument is valid or not. Explain your answers in as much detail as you can.

11. ## calculus

Find the second derivative of y=loge(logex) Show that y=loge(logex) is a solution of the equation xd^2y/dx^2 + x(dy/dx)^2 + dy/dx=o

12. ## Algebra I

Profit equals revenue minus cost. P=R-C. Rewrite the formula to solve for C.

13. ## ACCOUNTING

Part D - August Variance Analysis During September of the current year, the controller was asked to perform variance analyses for August. The January operating data provided the standard prices, rates, times, and quantities per case. There were 1,200 cases

14. ## Math

Two vectors 2a+b and a=3b are perpendicular. Find the angle between a and b, if |a| = 2|b|.

15. ## Statistics

What is a 95% confidence interval for mue, the population mean time the postal service employees have spent with the postal service? n=100 mean=7 S=2 years

16. ## chemistry

How will the following system at equilibrium shift in each of the following cases? 2 SO3(g) 2 SO2(g) + O2(g) H° = 197 kJ (a) SO2(g) is added (b) the pressure is decreased by increasing the volume of the container (c) the pressure is increased by adding

17. ## Math

Given two non-collinear vectors a and b, show that a, axb, and (axb)xa are mutually perpendicular. Also Express the unit vectors i, j, and k as ordered triplets and show that i x j = k what are ordered triplets? Using components show that u x v = -v x u

18. ## accounting

Part D Note: This section is a continuation from Parts A, B, and C of the comprehensive problem. Be sure you have completed Parts A, B, and C before attempting Part D. You may have to refer back to data presented in Parts A, B, and C as well as use answers

19. ## French

How do you unscramble the French word lapcre?

Please proofread this paper (without paragraphing... sorry) Thank you so much! Jane Goodall, the eminent woman known for changing the human perception of chimpanzees, is a renowned primatologist, speaker, and humanitarian. After her parents divorced,

21. ## pre-calc

A ship travels 200km west from port and then 240km due south before it is disabled. Illustrate this in a vector diagram. Usa trigonometry to find the course that a rescue ship must take from port in order to reach the disabled ship. i don't know where to

22. ## college algerba

Solve by the substitution method:

23. ## Legal

Under the legal definition of Fructus Industrials is it true that "Minerals in the Soil" would not fall under this? It would in fact, fall under Fructus Naturales?

24. ## chem

Nitrogen(75.5 kPa), oxygen (19.2 kPa), carbon dioxide(0.05 kPa) and water vapor(4.3 kPa) are the usual atmospheric components. What is the total atmospheric pressure in kPa?

25. ## chem

What volume will 1.216 g of SO2 occupy at 18 degrees celcius and 755 torr?

26. ## History

"What position would you take on appeasement if you had been living in Canada during the 1930's and had heard about Adolf Hitler and the Nazis? Explain why" Hi, could you please help me by giving me some sort of direction on what i should do, i am not sure

27. ## Physics

A lead ball, with an initial temperature of 25.0oC, is released from a height of 96.0 m. It does not bounce when it hits a hard surface. Assume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball after it

28. ## Algebra I

Budget is 118,250.00. Write an algebraic expression that is 25% of budget for business space and utilities.

29. ## physics induced voltage

A 500 turn solenoid with a length of 20 cm and a radius of 1.5 cm carries a current of 2.0 A. A second coil of four turns is wrapped tightly about this solenoid so that it can be considered to have the same radius as the solenoid. Find the following when

30. ## physics

a simple harmonic oscillator consists of a block of mass 2 kg attached to a spring of spring constant 100 N/m. when t=1 s, the position and velocity of the block are x=.129 m and v=3.415 m/s. A) what is the amplitude i figured that out and got sqrt(50) B)

31. ## chemistry

When carbon dioxide is heated in a closed container, it decomposes into carbon monoxide and oxygen according to the following equilibrium equation: 2CO2(g) ---> 2CO(g) + O2(g) When 2.0 mol of CO2(g) is placed in a 5.0-L closed container andheated to a

32. ## math

a paint supplier has two machines that prouce both indoor paint and outdoor paint. to meet its contractual obligations,the company must produce at least 60 gallons of indoor paint and 100 gallons of outdoor paint. machine 1 makes 3 gallons of indoor paint

33. ## History

Does anyone know any or know where I may find some quotes by General George Meade?

34. ## algebra

5x to the second+25x+30

For the first question I really need all help I can get. Thanks! 1. Given a and b are unit vectors, a) if the angle between them is 60 degrees, calculate (6a+b) . (a-2b) b) if |a+b| = sqrt3, determine (2a-5b) . (b+3a) 2. The vectors a = 3i - 4j - k and b =

36. ## Amber, Biology, DNA

Amber, Biology First of all, as Christina said, "Post a New Question" because when you post under someone else's post we assume it's an answer to that first question! Here are some sites for you on DNA: 1. (definition): http://en.wikipedia.org/wiki/DNA 2.

37. ## biology

am writting about the evolution of our understanding of DNA as genetic material. suggest good website so that i can read more. thanks

38. ## Math - check

Use the cross product to find a vector perpendicular to each of the following pairs. a) (4,0,0) and (0,0,4) I plugged in the cross product formula and got (0, -16, 0)

39. ## chemistry

Calculate the solubility of silver chloride in a 0.1 mol/L solution of sodium chloride at 25°C.? At SATP, Ksp AgCl(s) = 1.8 x 10^-10 What did I do wrong? AgCl Ag+ + Cl- [Ag+] = x [Cl-] = x + 0.1 Ksp = [Ag+] [Cl-] 1.8 x 10^-10 = (x) ( x + 0.1) x = molar

40. ## Algebra II

Simplify: x^5*x^pi Answer: x^8.14 Is this correct? I know that this is a repost of a question I posted yesterday, and I appreciate Damon looking at it, but I don't think I was clear in my typing of the question. Thanks.

41. ## computers

the importance of computers in our lives

42. ## Law

I'm stumped... I've gone through my book three times now and can't find this information. Can someone please help me? First... Which of the following is true of a voidable contract? A: It's valid to only one party. B: It's good for only a short period of

43. ## Philosophy

How would you construct a proof to show that the following arguments are valid? 1. TvH 2. T→G 3. ~H ֶG 1. ~~A 2. ~A v C ֶC 1. S • T 2. (S • T) → G 3. G →(H v B) ֶ H v B 1. A →B 2. C →D 3. A v C 4. ~D ֶ B

44. ## Math

I have a few questions on my homework assignment. I've been sick and I have no idea what I'm doing. Question 1: Assume the hights of high school bball players are normally distributed. For the boys the mean is 74" with a standard deviation of 4.5" while

45. ## essay

I´m an English teacher, I need a program that self correct essays from the students.Where can I find one?

46. ## Math

x^2+6x+27 m^2-m-12

47. ## chemistry

Please calculate the solubility of calcium sulfate in 0.010 mol/L calcium nitrate at SATP. This very question has been bugging me all weekend. Can some one please solve this quesiton it would really be appreciated.

48. ## Algebra

A 3lb puppy is gaining weight at a rate of 3/4 lb per week. When will the puppy's weight exceed 22 1/2 pounds? I need help setting this up to solve.

Why is the Spanish Civil war a forgatable war ? What was it ? Who was in it ? What are right and left wing ?

50. ## math

The head of a round piston has a pressure of 210 psi pushing down on it. The piston is 3 inches in diameter. What is the force pushing the piston down?

51. ## math

How much work does a 120 pound boy do in climbing to the top of the Washington Monument - a climb of 550 feet? If the climb in problem 2 takes 20 minutes, what is the average horsepower produced by the boy?

52. ## Pre Cal (logs)

I need help with these logs 1: Log underscore4 16X 2: 2 Ln ( X(sqr. root)e 3:5^[2logUnderscore5(3x)] 4:log underscore2 ^[1280-logunderscore2 5) I don't understand how to do them thanks

53. ## math

A 3000 pound car is pushed 500 feet by three boys. A force of 60 pounds is required to move the car. How much work did the boys accomplish? How much work can each boy claim if he did his share?

54. ## science

Hi. Can someone please explain to me the exact relationship between the greenhouse effect, global warming, and the ozone layer? I'm kind of confused because we had to write an essay on whether or not the greenhouse effect is controversial and everyone in

55. ## chemistry

Calculatet the solubility of silver chloride in a 0.10 mol/L solution of sodium chloride at 25 degrees celsius.At SATP, Ksp AgCl(s) = 1.8 x 10^-10

56. ## math

the distance between north bay and sudbury is about 125km. If they are 10 cm apart on a road map, what is the map scale?

57. ## HCA 220

I need help with an assignment that is due today and I am totally lost. All I need is for someone to point me in the right direction. For example, The approach is body planes and directions; what is the approach and how might the approach be used. Thanks!

58. ## Physics..an electric field

4 charged particles are at the cornedrs of a square of side a as shown. a) determine the magnitude and direction of the electric field at the location of charge q b) what is the total electric force exerted on q? basically picture is like this below It's a

59. ## geometry

how do you find the perimeter of a triangular pyramid

60. ## global warming

hi im doing a debate tomorrow on global warming, i am arguing that it DOES exsit. the opposing side who don't believe in global warming want to say that increases in temperatures don't cause sea levels to rise, instead the tectonic plates of the earth

61. ## science

I'm making a 3-d model of a plant cell what can i use to represent the cytoplasm? i'm in the 6 grade.

62. ## science

how do bacteria in the human intestine help maintain health?

63. ## social studies

list 5 key issues that kepp the palestinians and israelis from making a lasting peace settlement

64. ## math

How do you find the LCM of 3 and 7?

65. ## creating surveys

how to create a survey

66. ## ACCT

Part D - August Variance Analysis During September of the current year, the controller was asked to perform variance analyses for August. The January operating data provided the standard prices, rates, times, and quantities per case. There were 1,200 cases

67. ## physics

lenses that always diverge light rays that strike them is that convex or concave? I am not sure.

68. ## Physics (check)

True/False 3)The position-time graph of an object moving with a constant average velocity is always a straight line. True 4)A time interval is a scalar quantity. True

69. ## Physics(check)

7)A car is moving with a uniform speed of 15.0 m/s along a straight path. What is the distance covered by the car in 12.0 minutes? I don't know 8)What is the resultant of two displacement vectors having the same direction? The resultant is the sum of the

70. ## science

A 1-kg book is at rest on a desk. Determine the force the desk exerts on the book.

71. ## Physics(check)

9)You are taking a road trip to the beach for Spring Break. You leave at 12:00pm. At 12:10 you stop for lunch 10 miles down the road. You get back on the road and travel 75 more miles and realize that you need to stop for gas. You notice that it is now

72. ## Physics(check)

11)A race car travels on a racetrack at 38 m/s and slows at a constant rate to a velocity of 20 m/s over 10 s. How far does it move during this time? I don't know 12)The speed of a body is the distance traveled per unit time. Which of the following would

73. ## Physics(check)

13)What can you say about the motion of a body if its velocity-time graph is a straight line inclined with the time axis? The body moves with uniform velocity. 14)Which of the following conclusions can be drawn if a velocity-time graph is parallel to the

74. ## Physics(check)

17)Under what conditions can an object travel a certain distance and yet its resultant displacement be zero? When the final position is the same as the initial position.

75. ## Algebra II

1) A red die and a blue die are tossed. What is the probability that the red die shows a 3 and the blue die shows a number greater than 3? Answer: 3/5 2) Tickets are numbered 1 to 50 and placed in a box. Three tickets are drawn at random without

76. ## math

How do I know when a residual plot is the right one? I'm graphing the residuals for my information, but none of them seem to be close to zero? Does that mean that a better equation can be used?

77. ## accounting

Part D - August Variance Analysis During September of the current year, the controller was asked to perform variance analyses for August. The January operating data provided the standard prices, rates, times, and quantities per case. There were 1,200 cases

78. ## college algerba

Solve by the substitution method: 2x - 3y = 7 y = 3x - 7

79. ## macroeconomics

One of the early economic “laws” was called Say’s Law that stated that—supply creates its own demand. Using the circular flow chart, explain what this means and how an expanding population results in economic growth.

80. ## Music

So, the first movement of Mozart's 21st piano concerto (K. 467) is in sonata allegro form...which means there are two "themes" that are developed within the piece. I can pick out the first one--it's developed right in the first 20 seconds. But I can't

81. ## Algebra II

Two cards are drawn from a standard deck of cards. Find the probability that a king or a red card is drawn. Work: 4/52 + 26/52=30/52 or 15/26 Is this correct? Thanks

82. ## Probability

Mary had 6 pennies and 4 nickels. If she took three coins, what is the probability that all the coins were pennies? I think it's 18/24.

83. ## chem

Calcualate the volume of 0.300mol of gas at 60 degrees C and 0.821atm.

84. ## english

I need a summary on ch.13,14,15 on "Death on the Ice." by Cassie Brown I would really appreciate your help.

85. ## English expression

1. He has gray hair. 2. He has white hair. Can we use #2? Which one is right?

86. ## English

I have to write an outline for a research paper with the cons of performance enhancing drugs in sports. I have a lot of research, but I do not know how to organize it all into a 5 category outline (I. - V.) with examples and explanations for each. Any help

87. ## health care

what are some examples of activities one can participate in after i have received my bachelors degree that coincides with this philosophy of continuing education in health care

88. ## geometry

The measures of six angles in a convex heptagon are 120 degrees, 88 deg., 91deg, 164deg.,173deg.,and 99deg. Find the measure of the remaining angle.

89. ## Chem

For a process to be at equilibrium, it is necessary that a)DSsys = DSsurr b)DSsys = -DSsurr c)DSsys = 0 d)DSsys = 0 and DSsurr = 0

90. ## Chem

What equation can I use to solve this kind of problem? A metal undergoes electrolytic reduction according to ne- + Mn+ ===> M. What current (in Ampères) must be provided to deposit the metal at a rate of 1.914 mol/hr if n = 3?

91. ## social studies

what is zapatistas???

92. ## Chem

How many minutes will it take a current of 66.049 Ampères to deposit 86.825 grams of aluminum (26.981538 g/mol)? Al has a charge of 3, so n=3. MM=26.981538g/mol 1eq=molarmass/charge so 26.981538/3=8.9938 1eq=8.9938 1F=96485c/eq F=13138.29477 Am I on the

93. ## Chem

Whis is the relationship between DG and DGf° for the reaction MgF2(s) ===> Mg2+(aq) + 2 F-(aq) Is it: DG = {DGf°[Mg2+(aq)] + 2 DGf°[F-(aq)] - DGf°[MgF2(s)]} + RT ln([Mg2+][F-]2) or DG = {DGf°[Mg2+(aq)] + 2 DGf°[F-(aq)] + RT ln([Mg2+][F-]2) or am I

94. ## math

1. solve by using the quadratic formula. 5x^2+x=3 2. solve by completing the square. x^2=5x+2 3.solve by using the square roots method. 5(x-2)^2=3

95. ## math

186 is 60% of what number? (how do I find this out)

96. ## Physics

How do you write 600nm in scientific notation?

97. ## Physics

What is the color of all the visible light frequencies mixed together equally? I would think white. Is that right?

98. ## chem

a 4 L sample of gas at 30 degrees celcius and 1 atm is changed to 0 degrees celcius and 145,000Pa. what is its new volume?

99. ## Math (functions)

How can I tell whether a function will be reflected in the x-axis or y-axis and whether it will be horizontally and vertically compressed or not? For example, this function: y=-2f(4(x-2)) + 8

100. ## social studies

What did George Washington accomplish in office?

101. ## Probability

Erin's CD changer holds 6 compact disks. Justin uses the random function on to play all the songs randomly. If each of the disks on the changer holds 10 songs, what is the probability has favorite song will be first? If I am getting the hang of this, it's

102. ## Social Studies for Ryan

http://www.google.com/search?q=immigration+in+1840-1920&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA Lots of information in here. =)

103. ## physics induced voltage

I was given an equation by bobpursey but I don't know what it means. Considerable scientific work is currently underway to determine whether weak oscillating magnetic fields such as those found near outdoor power lines can affect human health. One study

104. ## Math and rubric

How can students be involved in understanding and using rubrics to help with their learning mathematic concepts or skills? I am sorry for not being mor specific ...

105. ## math

Graph the quadratic equation after completing the given table of values. y = x^2 – 2x?

106. ## Pre Cal

How Much must be invested now, at 3.75% interest, compounded monthly to have \$37,500 in 22 years? thanks

107. ## Heath - Debate

I need help to fill up my debate points. Debate - Young people should not be able to have sex before marriage. TeamVeiw - Against. So we disagree and think that they should be able to. Do you think people should be able to have sex before marriage? Why?

108. ## Chemistry

I don't understand how to work out the volumes of weak acid and strong base to mix to make 1L of buffer when given the concentrations of weak acid and strong base (in my case 0.160M NaOH and 0.200M H3PO4) and the pH required (7.00). Specifically the

109. ## Chemistry

I don't understand how to work out the volumes of weak acid and strong base to mix to make 1L of buffer when given the concentrations of weak acid and strong base (in my case 0.160M NaOH and 0.200M H3PO4) and the pH required (7.00). Specifically the

110. ## physics

A convex spherical mirror of focal length 15.0 cm is to form an image 9.00 cm from the mirror. Where will the object be placed?

111. ## physics

A man standing 1.25 m in front of a shaving mirror produces an inverted image 25.0 cm in front of it. How close to the mirror should he stand if he wants to form an upright image of his chin that is twice the actual size of his chin?

112. ## calculus

find the derivative of the function y=x^x Hence fin the coordinates of the turning point of the funcion y-x^x. Give the values correct to two decimal places

113. ## calculus

Differentiate e^(2x^3+x) X tan(x^2) tan e^x / ln(x^6/2-3x+3e) cos(tan(e^4x^2))

114. ## english - revision

My instructor suggested that I simplify the essay, so I can easily get my point across. Meanwhile, the feedback received from my peer reviewer was valid and will help me better my expository essay. The things that I will put in practice are the following:

115. ## Physics

1. A ball is projected horizontally from the edge of a table that is 4.0 meters high, and strikes the floor at a point 3.0 meters from a point on the floor directly below the edge of the table. The initial velocity of the ball as it is projected from the

116. ## Sose

I am researching fire ants for an assignment and need a map of where they were first introduced in Australia and where they have now spread in Australia. I have searched everything imaginable on google and found nothing. Can you please help me?

117. ## Rubric and mathematics

How can students be involved in understanding and using rubrics to help with their learning mathematic concepts or skills?

118. ## History

Could you say the cold war was like walking on thin ice...they were close to "breaking" through to war? How could I make a good phrase like this? thx

119. ## Calculus

Can someone solve this integral for me? My calculator just gives me a decimal approximation but I need an exact number. Thanks! :) pi[{3ln(3)^2 - 6ln (3) + 6} - {ln(1)^2 - 2 ln(1) + 2}]

120. ## physics induced voltage

A 500 turn solenoid with a length of 20 cm and a radius of 1.5 cm carries a current of 2.0 A. A second coil of four turns is wrapped tightly about this solenoid so that it can be considered to have the same radius as the solenoid. Find the following when

121. ## english

i really need help and almost every website can't help me saying what hopperty means i here own word what can i do

122. ## algebra

x to the second +5X-25

123. ## maths

Jerry monthly salary consist of \$850 pluss commission of 15 % on the total sales made.If his total sales for the month of March is \$ 25 000 ,what is his income for the month of March?