# Questions Asked onFebruary 24, 2008

1. ## Chem

Which of the following is the formation reaction for CaO(s) ? A. CaO(s) Ca(s) + 21O2(g) B. Ca2+(aq) + O2–(aq) CaO(s) C. 2 Ca(s) + O2(g) 2CaO(s) D. Ca(s) + 21O2(g) CaO(s). E. 2 CaO(s) 2 Ca(s) + O2(g) I know that you have to create an equation and I

2. ## organic chemistry

why is the trans-trans isomer of dibenzalacetone the most stable isomer?

3. ## chemistry

the fuel methanol(CH3OH) is made by the reaction of carbon monoxide and hydrogen. a) write the balanced chemical reaction b)how many grams og hydrogen are needed to produce 45.0 grams of methanol?

4. ## Physics

An engine is used to pull a train of two cars out of a mine. The floor slopes upward at an angle of 24o. Each car has a mass of 0.8x104 Kg and normally travels without friction on the tracks. The engine can exert a maximum force of 1.4x105 N on car A. If

5. ## Physical science

On a perfect day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward or downward. The total wieght of the balloon, including its load and the hot air in it is 20,000N. Show that the volume of the displaced air is 1700 m3

6. ## physical science

A merchant in Kathmandu sells you a solid gold 1-kg statue for a very reasonable price. When you get home, you wonder whether you got taken, so you lower the statue into a container of water and measure the volume of displaced water. Show that for 1 kg of

7. ## economics

Each week, Bill, Mary and Jane select the quantity of two goods, x1 and x2, that they will consume in order to maximize their respective utilities. They each spent their entire weekly income on these two goods. Suppose you are given the following

8. ## physics - DAMON

a +35x10^-6 C point charge is placed 32 cm from an identical +32x10^-6 C charge. how much work would be required to move a +50.0x10^-6 C test charge from a point midway between them to a point 12 cm closer to either of the charges? so can you show me the

9. ## finance

Can someone please help me with the following question. I am not sure even where to start. A 5-year annuity of 10 \$9,000 seminannual payments will begin 9 years from now, with the first payment coming 9.5 years from now. If the discount rate is 11 percent

10. ## Organic Chemistry-pls check

Which is the major product from acid catalyzed hydration (addition of water) of 2-methyl-2-pentene? a) 2-methyl-2-pentanol b) 2-methyl-1-pentanol c) 2-methyl-3-pentanol d) 3-methyl-3-pentanol answer: "c": 2-methyl-3-pentanol ???

11. ## Microeconomics-Consumer & Producer Suplus Graphs

Can anyone help? I am trying the draw the following graphs for Consumer & Producer Suplus. I have made several attempts and I know I am not drawing them right. 1) The cost of producing stereo systems has fallen over the past several decades. A)Use a

12. ## chemistry

4FeS2 + 11O2 yields 2Fe2O3 +8SO2. I don't understand this equation. FeS2 leads me to believe that the Fe here has a charge of +2 but in the product it appears to have a charge of +3 judging by the formulas. How is this possible and what is this equation

13. ## precalc

Eliminate the parameter and write the corresponding rectangular equation. X=2cos theta, y=4sin theta

14. ## Calc

A rocket is launched with an initial velocity of zero, and with acceleration in feet per second per second defined by: --------( 20e^(-t/2), for 0 10 seconds. Thanks!

15. ## math

the population of humorville is 8,500 people. in this town, jokes travel fast. in one hour, each person who hears a joke tells three other people who have not heard it, and tells no one else. last frieday, a visitor from out of town told the police chief a

16. ## Ap Chemistry

Hi, I was wondering if you could possibly help me with this chem question. For the relatively slow decomposition of NOCL into NO and Cl2 according to the reaction below, it is known that the reaction is second order w/ respect to NOCl and that after 23.4

17. ## Math

1)Find the value of 7+2(5-2*3^2) 7+2(5-2*9) 7+2(5-18) 7+2(-13) 7+-26 (answer)-19 2)Name the sets of numbers to which 457 belongs. (answer)natural,whole,integers,rational,reals

18. ## physics

You are a pilot on an aircraft carrier. You must fly to another aircraft carrier, now 1450 km at 45 degree of your position, moving at 56 km/hr due east. The wind is blowing from the south at 72 km/hr. Calculate the heading and airspeed needed to reach the

19. ## Physics

The question is: Can you photograph yourself in a mirror and focus the camera on both your image and the mirror frame? Explain. I tried it for myself and it's possible, but I just can't explain why.

20. ## Math(dispute to previous question)

2)Name the sets of numbers to which 457 belongs. (answer)natural,whole,integers,rational,reals My book says that every REAL number has to be rational or irrational. Blueridge said that my answer was correct except to exclude rational from my list. From

21. ## Organic Chemistry

I am really not certain on the following question: Which compounds contain stereocenters?? I) 1-chloropentane II) 2-chloropentane III) 3-chloropentane IV) 1,2-dicloropentane a)-> I, II b)-> III, IV c)-> I, III d)-> II, IV I) 1-cloropentane has

22. ## Math: Dot Product

A box with a weight of 215 N rests on a ramp. There is a frictional force of 27 N exerted on the box directed up the ramp. If the ramp is inclined at 30 degrees, what force must be applied at an angle of 40 degrees to the ramp to maintain equilibrium?

23. ## Chemistry

Which of the following is the best definition of Hess' Law? A. Since enthalpy is a state function, it will be different if a reaction takes place in one step or a series of steps. B. Heat is always released by the decomposition of 1 mole of a compound into

24. ## algebra 2

PLEASE HELP wiTH ALL OF THEse. I DON'T KNOW WHERE TO START---THANKS! 1. At 2pm the number of bacteria in a colony was 100, by 4pm it was 4000. Write an exponential function to model the population y of bacteria x hours after 2pm. 2.Using the information in

25. ## working with data

josephs final averages in science class are shown in the table below. homework % toward final grade-20% average-93 quizzes % toward final grade-20% average-92 tests % toward final grade-40% average-85 final exam % toward final grade-20% average-? what is

26. ## physics

how is dissociation and ionization similar

27. ## French- another check-over

A group of friends spent the weekend in Paris. Say where they each went, using the passe compose of aller. 1. Nathalie est allee au Louvre. 2. Eric et Jerome sont alles au Musee d'Orsay. 3. Caroline et Claire sont allees au Centre Ponpidou. 4. Vincent est

28. ## calculus

Assume x and y are functions of t. Evaluate dy/dt. xy - 5x + 2x^3 = -70; dx/dt=-5, x=2, y=-3

29. ## Genetics

Describe the inheritance and expression of cystic fibrosis, Tay-Sachs disease and sickle-cell anemia. I didn't understand what the question meant by "expression." Please help!

30. ## Chemistry

When 0.969 g of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 397C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. Delta Hrxn, for the reaction of CaO(s) +

31. ## Chemistry

How many moles of Carbon dioxide are produced from the decompostion of 1.45 grams of Aluminum Carbonate?

32. ## French- check-over

Use appropriate forms of voir. 1. Nous voyons une ferme. 2. Tu vois un lac. 3. Marc voit des baches. 4. Vous voyez un cheval dans une prairie. 5. Je vois un ecureuil dans un arbre. 6. Philippe et Stephanie voient des oiseaux.

33. ## calculus

Assume x and y are functions of t. Evaluate dy/dt. xy - 5x + 2x^3 = -70; dx/dt=-5, x=2, y=-3

34. ## Math

( / means absolute value) Solve: 3+/2y-1/>=1. Graph the solution set on a number line. The number line I have is: -5 -4 -3 -2 -1 0 1 2 3 4 5 6 First solution: 3+2y-1>=1 2y-4>=1 2y>=5 y>=5/2 I'm stuck b/c I had to correct the first part. I had a whole

35. ## rl

If steak is a normal good and its price rises

36. ## chemistry

When 0.954 g of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 391C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant

37. ## algebra

find the real number solutions of the equation. w^4+w^3-w=1 could you please show step by step..thank you

38. ## math

Let PSR be a triangle. Let A, B, C be the midpoints of the sides PS, PR and SR respectively. The following numbers 2,3,4 and 6 are lengths in inches of the three segments: AB, AC and BC and one of the sides of the given triangle PSR. Question: Which of the

39. ## Trig word problem

A park ranger at point A sights a redwood tree at point B at an angle 23 degrees from a fire tower at point C, From the fire tower, the Angle between the ranger and the tree is 123 degrees. If the ranger at point A is 2.3 miles from the fire tower at point

40. ## Stoichiometry

How much iron (II) sulfide would be needed to prepare 15L of hydrogen sulfide? My balanced equation is 2HCl + FeS --> H2S + FeCl2. I have converted 15L H2S to mols, but I have no idea where to go from here.

41. ## L.A or C.A

Hello everyone! I have a question about feature articles... How is it suppose to look like? Can you find me a feature article on anything so I can see the formate? well thank you! =)

Story Problem Some friends are recording songs on a CD. The first 1/5 of the CD has Alex's songs.The next 12 minutes of songs are Henrique's. 1/3 of the time is Brian's songs. Sally has 32 minuites. How many minutes of music are there in all?

43. ## calculus

the the sum (using the integral test) from k=1 to infinity of (lnk)^2/k I said divergent because the interval goes to infinity is this correct?

44. ## chemistry

When 0.627 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 102C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. The molar heat of reaction, H rxn,

45. ## chemistry

calculate the number of atoms in the following masses. a) 54.0g of aluminum b) 69.45 g of lathanum c) 0.697 g of gallium d) 0.000 000 020 g of beryllium

46. ## Writing Assignment

I have to write a short essay on a movie called the seventh seal and I was wondering about a certain part that interested me and that would be where he is playing chess with death can any one give me some help with this... like what does it mean... and ect

47. ## Social Studies

Is Indiana's major lake, Lake Michigan? Can you also give me some information on it please?

48. ## chemistry

What is the mass of hydrogen produced from the reaction of 2.31 grams of HCl with magnesium?

How many stereoisomers are there for 1,2-dichlorocyclopentane?: a) 1 b) 2 c) 3 d) 4 answer: "B" (2)??? or: "D" (4)??? How many stereoisomers are possible for: cortisone acetate?: a) 32 b) 64 c) 128 d) 256 answer: "B" (64)??? How many stereoisomers are

50. ## chem

Which of the following is NOT true about the thermodynamic standard state? A. A gas is in its standard state when its pressure is 1.00 atm and its temperature is 25C. B. An aqueous solution is in its standard state at a concentration of 1.00 M. C. A pure

2x+3y=6

52. ## Essay

What main points do you think I should include in my essay ("Why I should be in this advanced class")? I've written most of it. The topic was so general that I am not sure that I've hit all the points I should have. Could you provide some points that you

53. ## trig

Two ships, one sailing at 30 km/hr and the other at 45 km/hr, left port at the same time. Three hours later they were 120 km apart. If you had to find the angle between their courses an equation that could be used to solve this problem is:

54. ## trig

In triangle ABC, find

55. ## accounting

how do you find average price at which the shares were issued? common stock without par value, 4000000 shares authorized, 800000 shares issued, and 720000 shares outstanding

56. ## electricity 188

hi my name is christina and i have an electrical question i need help with. i am taking power engineering electrical 188. the question is: how much will ity cost to use 6 lamps of 100 W each if they burn for 5 hours each evening in a month (30 days). the

57. ## Organic Chemistry

I just want to check if I am correct on this Q: What is the major product formed when 1-butene reacts with water in the presence of dilute sulphuric acid? a) 1-butanol b) 2-butanol c) butane d) 1-methylpropanol I "think" that it "should" be "B"

58. ## biology

1. What are the three parts that make up a nucleotide? 2. What is the sugar found in DNA? 3. What are the four different bases found in DNA nucleotides? 4. What two parts make up the sides of the DNA “ladder”? 5. What holds the sugars and the

59. ## Chemisty

A reaction of the form aA---> Products is second order with a rate constant of 0.169 L/(mol*s). If the intial concentration of A is 0.159 mol/L, how many seconds would it taje for the concentration of A to decrease to 6.07X10^-3 mol/L

60. ## English

Martin Amis's characterizations for Muhammad Atta in "The Last Days of Muhammad Atta" I read it but i don't see ANYTHING based on how he is characterized :( i can't post the website but if you type 'Have they been with you at all times?' in google than ull

1. An ionic compound solution is a(an)________ of electric current. non-conductor absorber emitter good conductor reverser ans: good conductor 2. Hydrogen bonding in water accounts for water's higher than expected boiling temperature the fact that ice

62. ## chemistry

How many grams of potassium sulfide are produced from the reaction of 1.23 moles of potassium with sulfur?

Imagine that you spent a day in the country taking pictures of animals. Make a list of 8 different animals that you saw. J'ai pris des photos de (d'): 1. un ecureuil 2. un oiseau 3. une poule 4. un lapin 5. une vache 6. un cochon 7. un canard 8. un cheval

64. ## LOCI method

What is the loci method? I found it on a list of tips for being a better student, but there was no explanation.

65. ## algebra

could you please multiply these together and tell me what you come up with..im having trouble coming up with the right answer...im doing something wrong but don't know what!! (-.096t^4+3t^3-27t^2+91t+1700)*(.043t+49)

leer

67. ## Improving Nonverbal Communication

How do you know that your perception of what is being communicated is accurate? Which nonverbal cues can potentially convey a misunderstanding? An understanding? How can criminal justice professionals build strong nonverbal communication skills?

68. ## maths

calculate the size of the angle or side marked on each of these diagrams

69. ## shakespeare

What is Shakespeare refering to when he says "O thou weed, Who art so lovely fair and smell'st so sweet That the sense aches at thee" in Othello? I havent read this, but I was wondering, is he talking to a person, or a plant?

70. ## calculus

is the sum from k=1 to infinity of 1/(k^2+1) convergent? i said it was because the integral is convergent

71. ## calculus

true or false: if the sum from n=1 to infinity of a(n) converges, and the sum from n=1 to infinity of b(n) diverges, then the series from n=1 to infinity of (a(n)*b(n)) diverges i said this was true... is this correct?

72. ## science

a balanced chemical equation has

we are working with logarithms and i don't understand them at all! I get the basic content but then it gets a little more advanced, and I get completely confused. There's one in particular that I have NO idea how to do. Help please?! Simplify: 3 ^

74. ## Math: Vectors

I forgot how to do the following, so I'm not sure if they're correct or not: Find the work done by a force "F" that causes a displacement "d". i and j = unit vectors a) F = 4i + j d = 3i + 10j W = (4i + j)(3i + 10j) W = 12|i|^2 + 40ij + 3ij + 10|j|^2 W =

75. ## calculus

You are working as assistant to a major movie producer from Hollywood, but mainly you look after pre-release film publicity. You are an old hand at publicity, having worked in several production companies before. Based on previous experience you have

76. ## vocabulary

what is a word that describe someone with good deeds, and the antonym of that word too..thanks

77. ## History

In the time when the colonies were first being established who claimed the land to the west and north of the English colonies?

78. ## Writing

I am writing an essay about Ghost in The Shell the original film and I was thinking that the Ghost stance is pro technology than con, what do you think it is and why?

79. ## scince and tecnoley

what is a structure

80. ## maths

1) Circle centre (7,-2) passes through (-2,10). Calculate radius and find equation of circle. 2) AB is diameter of circle A(9,5) B(-1,-7). Find equation of circle mid point. I know i have to use the eqn (x1+x2)/2 and (y1+y2)/2 3) Find the equation of

81. ## essay (the american dream)

i need to write an essay and make three points about how the american dream is unattainable. so far i've got: advertising, problems with upward mobility, and that the dream is always changing. any other suggestions?

82. ## english

DICIPLINE OF THE MAN

83. ## Social Studies

Is the Mississineewa Lake A MAJOR LAKE at Indiana! And for peace sake I mean is it a Major! LAKE! in Indiana!!!! And I! don't mean is it in Indiana!

84. ## Math_Statistics

Some IQ scores are standardized with a mean of 100 and a standard deviation of 16. Using the 68-95-99.7 Rule, Determine: a.In what interval you would expect the middle 95% of the IQ scores to be found. b.What percent of people would have an IQ score above

85. ## Math

1)The sum of a number and 17 more than twice the same number is 101. Find the number. 17+2n=101 17-17 101-17 2n=84 n=42(answer) 2)Evaluate: 5-/a+5b/ if a=-12 and b=2. 5-/-12+5(2)/ 5-/-12+10/ 5-/-2/ 5-2 3(answer)

86. ## novel

In tale of two cities please answer these questions in chapters 11,12,13: 1-why did darnay decided to go back to paris? 2-"in the name of that sharp female born and called la guillotine why did you come to france" who said these words?to who and when?

87. ## English

i just wanted to know what these proverbs meant from the book "Things Fall Apart" first one: " If I fall down for you and you fall down for me , it is play" second one: "If one finger brought oil it soiled the others"

88. ## Thoreau

Can someone please help better explain this quote to me by Thoreau? "Truth is always in harmony iwth herself, and is not concerned chiefly to reveal the justice that may consist with wrong-doing."

89. ## inequality

Define a variable and write an inequality. Then solve. A local summer baseball team plays 20 games each season. So far, they have won 9 games and lost 2. How many more games must they win this season to win at least 75% of all their games? I don't know

90. ## Chemistry

N2H4(g) + H2(g) ---> 2 NH3(g) H1 = â€“1876 kJ 3 H2(g) + N2(g) ---> 2 NH3(g) H2 = â€“922 kJ The H f for the formation of hydrazine: 2 H2(g) + N2(g) N2H4(g) will be _________ kJ/ mol.

91. ## Chemistry

Cyclobutane consisting of molecules in which four carbon atoms form a ring decomposes when heated to give ethylene. The reaction is first order. In an experiment, the initial concentration of cuclobutane was 0.00150M. After heating at 450 degrees C for

92. ## year7 french

im learning about countries in french and i need to translate the countries written in french into english. i need to find what la nouvelle is i have looked on the site ms sue found but cant find it im not sure if it is new zealnd. thanks

93. ## History

Does the federal reserve system affect us directly in any way? How?

3x+7=y-5

95. ## Social Studies

1) What are Indiana's natural resources. 2)What are Indiana's most important way to make money: tourism, manufacturing, mining,agriculture, farming lumbering, fishing, etc. Hope you could give me some websites about these question. Therefore, please be

96. ## Chem

When diluting a concentrated acid, add (water or acid) slowly to (water or acid) with sirring. I think you add acid slowly to water because if you add water to acid than it may explode.

97. ## Chem

Based on H f = –1275 kJmol of glucose, the formation of glucose will be (endothermic or exothermic) and heat will be (released or absorbed) to /from the surroundings.

98. ## Math/Sciance

Can someone please give an example of how i can use this formula in a word problem... Work out (J) Percent efficiency(e)= ____________ x100 Work in (J)

99. ## Math/Science

Can someone please give an example of how i can use this formula in a word problem... Percent efficiency= Work out (J) _____________ x100 Work in (J)

100. ## CHEMISTRY

When 0.756 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 123C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant

101. ## Math

exploring variables in probability building spinners... a spinner with 5 pies. red=1/6 blue=1/3 green=1/6th yellow =1/6

102. ## SOCIAL STUDIES/ GOVERNMENT

WHICH OF THE FOLLOWIN IS A METHOD OF FORMAL AMENDMENT ???

103. ## Writing

wat are some words that describe a place or thing, like the disney castle??? heavenly like, but not real...

104. ## science

How do whales adapt to their habitat??????????????????????????

105. ## Chem

Which of the following is the formation reaction for CaO(s) Ca(s)+ 1/2O2(g)arrow Cao(s) is that right

106. ## biology 110

you are making a standard to be used to measure protien concentration. you have added 2ml of protien, 3ml of water, and 4ml of an indicator dye. How would you prepare the blank for this experiment? we are using the Spectrophotometer

107. ## Accounting 11

I need help completing a statement of cash flow using the indirect method.

108. ## French- this is just for a check-over

Complete the following sentences with a verb from the box. In the box are the following words: apprendre, comprendre, prendre, and mettre. 1. Pour aller a l'ecole, nous prenons le bus. 2. Je ne comprendons pas. Parle plus fort! 3. Florence prend un disque

109. ## Math

Simplify by factoring. ^3sqrt 54x^8

110. ## Accounting 11

What all goes on cash flow statement using an indirect method? How would it show on the sheet?

111. ## accounting

M is designing and building a special computer for D. The price for the new computer is equal to M's costs of building it plus a flat fee of \$50,000. M's expense accounts: Emloyment Costs: Wages & salaries, including vacation pay and sick leave Social

112. ## trigonometry

In triangle ABC, a=8, b=15, and m

113. ## marketing

I really need help with this. Its the only part of my coursework I cant do.

asked by What I market mapping?
114. ## Math

How do you complete the proof for the integration of dx/sqrt(a^2 - x^2) = arcsin (x/a) + C. a is a constant.

115. ## Chem

How many stereoisomers are there for 1,2-dichlorocyclopentane

116. ## psychology

can you creat a sentence with the word micro-systems?

117. ## precalc

what are the slopes of the asymptotes of the hyperbola: (x^2)/9 - (y^2)/4 = 1

118. ## Social Studies

Is Mississinewa Lake a mjor lake in Indiana?

119. ## forces

what is the measure of the amount of force needed to move an object a certain distance?

120. ## math

crystal wants to build a ramp that will rise 4ft over a horizontal distance of 20ft. how long will the ramp be? round to the nearest tenth.

121. ## english

How do you write a report on improvements in your area?

122. ## history

Which countries wanted to join the European Union in 2002?

123. ## history

How does the supreme court show that the constitution allows congress to exercise the power to regulate commerce within a state?

124. ## accounting

how do you find retained earnings when. retained earnings, 245,200 net decrease in total assets, 37,400 net increase in A.R. 8,600 dividends declared and paid 33,600 proceeds from issuance of bonds 88,400 net loss for the year ended 23,00

125. ## english

how do you answer the phone when the person is looking for you? like...the person said "May I speak to _____?" what are the different ways to answer if it were you actually on the line?

is habitat for humanity like a community foundation organization

What is the evolution of business?

What would you say Feudalism means related to business?

129. ## managerial economics

Can anyone give me any information concerning the rate of business failures, and does the rate of failure off small businesses differ from that of large businesses?

4/5 - x/3=10

131. ## social studies

My grandson has to write down services. What do they want?

133. ## Calculus (Partial Fractions)

My Calculus class just started Partial Fractions, and I understand MOST of it. I'm having a slight problem though, when either C, or C and D come in. I understand A/(something) + B/(something) But I become confused when it's either A/(something) +

134. ## history

why most American slaves don't have birth record?

135. ## english

Digging in New Mexico for prehistoric artifacts suggests what area of anthropology

136. ## Economic

Which countries wanted to join the European Union in 2002?

137. ## Histroy

How does the supreme court show that the constitution allows congress to exercise the power to regulate commerce within a state?

138. ## Economics

How do you find the inverse of the demand function: Q = 4,000 - 125P P = ?

139. ## accounting

Paul incorporated Antler Paul contributes \$1,000,000 cash in exchange for 100,000 common shares in Antler

140. ## science

what is germination

141. ## spanish

how can i turn this queswton ( yo estudiaba mis lecciones todos los dias) into a imperfect tense?

142. ## Financial Accounting

i. contributes \$1,000 cash in exchange for 10 common shares to start of a business what would be the journal entry for this Thank you

143. ## american history

When did the United States own all the lands from Atlantic Ocean to Pacific Ocean?