# Questions Asked onMarch 5, 2007

1. ## Gen chem II

Calculate the work done when 50.0g of tin dissolves in excess acid at 1.00atm and 25 (degree in celsius) Sn(s)+2H(aq)----- Sn(aq) +H2(g) Assume ideal gas behavior The work done = (pressure)*(increase in volume) The increase in volume is due to the H2 gas

2. ## Economics

6. The chapter uses the analogy of a "leaky bucket" to explain one constraint on the redistribution of income. a. What elements of the U.S. system for redistributing income create the leaks in the bucket? Be specific. I would think it would be “people

3. ## math

the disney golf classic starts with 64 golfers. the golfers form pairs and each pair plays a match. the losers drop out and the winners of each pair then form new pairs and play again. then those winners form pairs and play. this continues until there is

4. ## Physics

How much heat is added to a 10.0 g of ice at -20.0 degrees Celsius to convert it to steam at 120.0 degrees Celsius? compute and add the following heats: heat to heat ice from -20C to 0C heat to melt ice at 0C Heat to heat water from 0 to 100C heat to

5. ## spelling

what do you mean by chronological chronological means in the order of advancing dates. http://www.answers.com/chronological =)

6. ## chemistry

Please, will someone help me balance this equation? There's always one element I just can't seem to balance. Cu+HNO3===>NO2+Cu(NO3)2+H20 Thanks for the help. Try this. Cu + 4HNO3 ==> 2NO2 + Cu(NO3)2 + 2H2O You're a genius! Do you think you could tell me

7. ## math

a number has 4 digits. no digits in the number are repeated. the digit in the tens place is three times the digit in the thousands place. the number is odd. the sum of the digits in the number is 27. what is the number? I started with the 10s and 1000s

8. ## Biology

I really need help with my science lab. I was sick when we did the lab on Thursday and Friday was a snowday so I did not get to get the observations off my peers. My teacher has allowed people one more day and I do not understand this Lab at all. If

9. ## Physics/Math

A 2.8 kg body is at rest on a frictionless horizontal air track when a horizontal force F acting in the positive direction of an x axis along the track is applied to the body. The force F is applied to the body at t = 0, and the graph records the position

10. ## math,help,bobpursly

What are some challenges for rational expressions? Also on my previous question about why are polynomials important bobpursly can you expalin it to me towards what you ment about your responce because i still do not undertand...thanks when you get a

11. ## sentences

Please note that we don't do students' homework for them. Once YOU have tried to write a sentence for your assignment, please re-post. Then someone here will be happy to give you feedback. =) who can you put a sentence that has including eveyone including

what element results if two protons and two neutrons are ejected from Radium what element results if two protons and two neutrons are ejected from Radium Look up the atomic number for radium, and subtract two. What element has that number? Radon??? a

13. ## soial studies-URGENT!!NEED BY 8:25 A.M. TOMORROW!

Who was an important person in Christianity,islam and judaism, where were they started and when were they discovered? THANX!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :) Type in these different religions in a google search or Wikipedia, find the name of a person that

14. ## science

I have a beak like a bird And my arms are like snakes I hav more ink than a pen But I write to confuse What am I What animal has arms (or legs) that are like snakes? Look to the water. Although I haven't solved the riddle for you, I hope the additional

15. ## physics

The Doppler effect occurs when a) a source of sound moves toward a listener b) a listener moves toward a source of sound c) a listener and a source of sound move away from each other d) a listener and a source of sound move toward each other. e) all of the

16. ## frankenstein

In Mary shelley's frankenstein, did frankenstein believe in democracy? This site will give you information on Themes and Motifs in that book. http://www.sparknotes.com/lit/frankenstein/ However,NOW the term Frankenstein has come to have an anti-democratic

17. ## Science

What is the ratio of phenotypes in the offspring produced by the cross Aa x Aa, assuming complete dominance for the trait? a. 100% dominant (D) b. 100% recessive (R) c. 25% D, 75% R d. 50% D, 50% R e. 75% D, 25% R One gets AA, Aa, aA, aa so three of the

18. ## Math

If Sally can paint a house in 4 hours, & John can paint the same house in 6 hours, how long will it take for both of them to paint the house together? ' I am having trouble remembering how to set up the equation? Amount of work accomplished = (Rate of

19. ## Math-Limits

sqrt(1+tan x)-sqrt(1+sin x) lim all divided by x^3 x-->0 Use that Sqrt[1+x] = 1+ 1/2 x + 1/2 (-1/2)/2 x^2 + 1/2(-1/2)(-3/2)/6 x^3 + O(x^4) You can thus write the numerator as: 1/2 [tan(x) - sin(x)] - 1/8 [tan^2(x) - sin^2(x)] + 1/16 [tan^3(x) - sin^3(x)] +

20. ## Physics/Math

An iceboat is at rest on a frictionless frozen lake when a sudden wind exerts a constant force of 212 N, toward east, on the boat. due to the angle of the sail, the wind causes the boat to slide in a straight line for a distance of 7.0 m in a direction

21. ## GuruBlue/English

Yesterday, I asked the question about my thesis statement for Hamlet. Heres what I wrote: Hi, I'm writing an essay on how Hamlet is a participant of hypocrisy. Can anyone help me write a thesis statement. My points are that his father tells him to avenge

22. ## social studies

vilres what is this word unscramble it please http://wordsmith.org/anagram/ Type vilres in the box, and enter. there are three neat words. Mayb silver,sliver or livers Hope they help WLCM :)

23. ## Physics

After a completely inelastic collision two objects of the same mass and the same initial speed are found to move away together at 1/2 thier initial speed. Find the angle bewteen the initial velocitie of the objects? Can you please show me the step to solve

24. ## Chemistry

Compound 1 / Compound 2 / O " CH2 = CH - CH - OH + CH3 - CH - CH2 - C ' ' ' CH3 CH3 OH i) Identify any functional groups in Compounds 1 and 2 and name them. ii) Complete the equation for reaction 1 by drawing the abbreviated structural formula(e) of the

25. ## Econ

For a typical negative externality market graph, with Demand curve (also labelled private value), and supply curve (private cost) and a social cost curve above the supply curve. What is the optimal quantity that maximizes total economic well being? Is it

26. ## consolidated balance sheet

Can someone please help me with the following question. I am not really sure even how to start. One company purchased all of the common stock of another company on January 1, 2005, paying slightly more than the fair value of acquired company's net assets.

27. ## Aurthers & Books

In Act One of the Crucible by Arthur Miller. Miller included information about land disputes, lawsuites, and job oppointments. What effect do you predict this new crisis of suspected witchcraft will have on the commounity? Please note that we don't do

28. ## Chemistry

How many grams of oxygen can be produced by heating 10.0g of mercury (II) oxide? Sulfuric acid is added to 8.10g of magnesium, how many grams of hydrogen are set free? Answered abovd.

29. ## math

mr.jackson is preparing bags of treats to give trick or treaters on halloween he has 48 pieces of candy and 60 pieces of gum he uses al the candy and gum and he puts the ratio of candy to gum in each bag. what is the largest number of bags he could have

30. ## organic chemistry

which alcohol and carboxylic acid would produce benzyl isobutyrate by Fischer esterification? and which alcohol and carboxylic acid would produce isobutyl benzoate by fischer esterification? I can't find anything about Fischer esterification specifically.

31. ## Chemistry

Ok, I think I have this one but can you please check my work? A nationally known company markets a product called "cleaning vinegar" that is not designed for human consumption. What is the Mass Percent of acetic acid (HC2H3O2) in this product, if 25 drops

32. ## Calculus II

What is sin(i) -- (sin of the imaginary number, i) What is cos(i)-- cosine of the imaginary number, i orrr tan(1+i) You can derive these things from the equation: Exp(i x) = cos(x) + i sin(x) ---> sin(x) = [Exp(ix) - Exp(-ix)]/(2i) cos(x) = [Exp(ix) +

33. ## chemistry

I am in the process of calculating the hydrogen ion concentration in a .25litre solution of sulfuric acid,.21g of sulfuric acid was disolved in water to make the solution. I have calculated the molarity of the acid to be 2.14x10^-3 mol per litre. I also

34. ## social studies

what accomplishments does Troy have?? Troy was a city, and had no accomplishments. However, its inhabitants at different times accomplished interesting things, I'm sure. Troy is most famous as being the city near which the Trojan War was fought, as

35. ## math

solve and writein simplest terms: 3 yards 1 foot 10 inches+ 5 yards 2 feet 4 inches 8 yards 3 feet 14 inches 8 yds 4 feet 2 inches 9 yards 1 foot 2 inches. check that. you need to convert everything into inches 1 yard = 16 inches 1 foot = 12 inches The

36. ## math

underwater pressure can be found using the formula p=L+d/33 where p is the pressure (in atmospheres), and d is the depth of the water in feet. If a scuba diver is experiencing 3.4 atmospheres of pressure, what is the depth of the diver? The L is really

37. ## chem

Consider a Carnot engine operating between the temperatures of 300. K and 189 K. Find the efficiency of this engine. Assume, now, that the isothermal step at 300. K is not reversible and the expansion takes place against a constant external pressure of

38. ## mummification

Besides human beings, what did the Egyptians embalm? Thank you for using the Jiskha Homework Help Forum. Often pets were also mummified to put in the pyramids with their owners. Here is a site to help you:

39. ## Math

If Leah is 6 yr.s older than sister, Sue, & John is 5 yrs. older than Leah, and the total of their ages is 41. How old is Sue? Still having problems setting the problem up. Have hit a brick wall. Any suggestions? Have you tried algebra? Let J = John's age

40. ## Help now please, Chemistry

How many grams of oxygen can be produced by heating 10.0g of mercury (II) oxide? Sulfuric acid is added to 8.10g of magnesium, how many grams of hydrogen are set free? I'll do the first. You do the second by following the first as a guide. 1. Write the

41. ## brain teaser

Using all of the letters A to Z only once complete the following words. *e*er **eue **o ma* *p*a*e* *erso* ***k*am*on *ouse *a* *ur* ***igent Please note that we don't do students' homework for them. In addition, a better place to post riddles and brain

42. ## Physics/Math

A machine carries a 5.0 kg package from an initial position of di = (0.50 m) i + (0.75 m) j + (0.20 m) k at t = 0 to a final position of df = (8.00 m) i + (11.0 m) j + (7.40 m) k at t = 13 s. The constant force applied by the machine on the package is F =

43. ## BIOLOGY!! TEST TOMORROW!!!

Whats the difference between adrenaline and noradrenaline??? Any help would be appreciated!!! That's a fair question. We'll tackle the simple part first. In North America, we refer to the two compounds as epinephrine and norepinephrine while in the UK

44. ## math

56% what would thefraction and decimal be 56% = 56/100 (which can be simplified by dividing both numerator and denominator by 4). Take your best guess for the decimal equivalent. We'll tell you if you got it right.

45. ## S103 - Discovering Science

Is anyone Studying S103-Discovering Science. On TMA 6 blocks 7-8, having a little trouble can anyone Help Rather than using abbreviations, could you give us more details about your problem? This would help us to help you. I hope this helps a little. Thanks

46. ## Math

A triangular garden plot has one 16 foot side. The height perpindicular to that side is 12 feet 6 inches. If each plant requires 36 sq. in. of space, how many plants can be placed in the plot? Divide the area of the triangle by the area required per plant.

47. ## science

how many groups of birds are there and name them Since this is not my area of expertise, I searched Google under the key words "bird classification" to get these possible sources: http://www.earthlife.net/birds/intro.html

48. ## Science

A drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of 40cm2. Assume that the oil film has a uniform thickness equal to the diameter of a oil molecule. Calculate the

49. ## Science

How do I find out about tools used 100 years ago that are still used today? go to google and type intools used 100 years ago

50. ## chem

I have to balance an equation and I had to make the equation from an experiment we did. So far, my equation looks like this and I know what I have is correct: Cu(NO3)2+H20+NaOH----->Cu(OH)2 I think I probably need an N or a Na on the right side. What do

51. ## area of circle

My circle has a radius of 8ft. What is the distance of the circle? What "distance" are you talking about? Diameter? Circumference? What is the area of a circle with the radius of 32 cm????

52. ## Human biology Coursework

On the net it has been suggested and my experiment it has been proven that Fructose can break down Vitamin C or atleast stop it from being effective in some way. I can not find ant theories on the net to how this breakdown happpens. As someone who has

53. ## Physics/Math

At a certain instant, a particle-like object is acted on by a force F = (3.0 N) i - (1.0 N) j + (8.0 N) k while the object's velocity is v = - (2.0 m/s) i + (4.0 m/s) k. What is the instantaneous rate at which the force does work on the object? (b) At some

54. ## Calculus AP - Volume of Revolution

Hi. I have a few calculus problems that I have to do using the washers and shell method to find out what the volume of the graph rotated is. I'll post one question at a time with my work. The problem is, I should be getting the same answer for the problem

55. ## externalilties MC

Negative externalities in a market could be internalized if a) there were a tax on the product b) there were a subsidy on the product c) production were stopped d) the Coase Theorem failed which is the correct answer? what does it mean by internalized? In

56. ## math

56%, what would the fraction and decimal be 56/100= 23/50 .56 is a neat fraction. What does it mean? How many hundredths is .56?

57. ## Formula

The formula for usinng alligation to repare solutions work for solutions between__ %and __ % a.0,50 b.25,75 c.50,100 d.0,100 Somewhere there is a disconnect between my understanding of chemistry and yours: What is alligation? What formula are you speaking

58. ## Area of circle.

The area of the circle is radius squared times 3.14. That gives you an area in square feet. The volume of the tank is that area times depth. That gives you a volume in cubic feet. Your comment about fish per ft makes no sense at all. Did you mean 2 fish

59. ## Science Question 1

If our Sun was Population II, the solar system would contain no ________ planets. Since this is not my area of expertise, I searched Google under the key words "sun population II" to get these possible sources: http://en.wikipedia.org/wiki/Metallicity

60. ## 5 g vial

A 5 g igal reguires addinng 8.6 ml diluent to get concentration of 250 mg/ml. The powder volume is __ ml a.9.3 b.10.6 c.11.4 d.12.8 Does the powder form a solution or a colloid? IT makes a big difference. In solutions, the sum of the powder volume and the

61. ## area of circle

The radius of a circle is 8ft. I have 60ft of tile. Is this enough to cover circle. Do you mean you have 60 SQUARE feet of tile? The circle's area is much more than that. How would you find he angle to a circle if half of it is 12 in. ??? and how owuld you

My questin is If r=5z then 15z=3y, then r= I just can't seem to determine how to set this problem up. I tried subsutition but that doesn't work for me either? Thanks in advance I assume you want to define r in terms of y. If r = 5z, then 3r = 15z.

What volume of helium would be in a baloon the size of a soft drink? The same volume that the soft drink occupies.

64. ## english - essay writing

is it ok to use the word 'you' in a persuasive essay? As in: "Where else do you see desperate ladies act like crazed maniacs for a sad 15 minutes of fame, or as they’d like you to believe the love of.." yes sounds good so far thanks halida. =) could you

65. ## English

define:passage a portion or section of a written work / one pargraph of something http://www.answers.com/passage Excellent dictionary. =)

66. ## pre cal

write the standard form equation of the parabola with vertex (-2,-2) that goes through point (-1,0) y= a (x-b)^2 + c b has to be -2, that gives the shift to the left. y=a( x+2)^2 + c when x=-2, y=-2, that makes c -2 y=a( x+2)^2 -2 finally, put the point

Can someone help me figure this out? 1. Find the first and third quartiles, Q1 and Q3 of the following numbers: 347,242,146,391,249,567,277,218,319 and 0.16,0.08,0.27,0.20,0.22,0.32,0.25,0.18,0.28,0.27 2. Which of the following numbers are integers?

68. ## Science Question 2

The resolution of metal poor red giants in the core of the Andromeda Galaxy by Walter Baade in the 1940s led to the discovery of the stellar what?

69. ## chemistry

I require assistance with the drawing of the lewis structures for hydrogen cyanide and cyanogen. I have already drawn the structured molecular formulas and am now stuck. H:C:::N: :N:::C:C:::N:

70. ## math

why dosnt the commutitive property work with subtraction and division? For subtraction : Because a - b and b - a are not the same. They are of opposite sign. For division: a/b does not equal b/a. If it did, you would have a^2 = b^2 for ANY a and b, which

71. ## pygmalion

in the play pygmalion, i need to compare mrs. pearce to a person or sect in american or british society. OK, do that and someone where will critique your thinking. I do however suggest you type your responses in standard English, including capitalization.

72. ## English

I need a thesis that encompasis this essay "Is this the promised end?" By Joyce Carol Oates. You can google it. Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your assignment on

73. ## math

how long it would take to pay off a credit card balance of \$1000 if you pay the minimum of \$35 a month at a flat yearly interest rate of 18%. Is interest charged monthly? Compounded? Under monthly compounding, the answer is three years and two months.

74. ## Math

To determine a GPA: 2(credit( Hr. Art, 3Hr. History, 4 Hr. Science 3 Hr. Math, & 1 Hr. Science lab. The scores were B in Art, A in History, C in Science, B in Math, A in Science Lab. What was the GPA based on 4 point scale? I continue to get 3.2 but that

75. ## Algebra

what is the equation of a line that passes through point (0,-9) with a slope of 6 (y - (-9))/(x - 0) = 6 (y+9)/x = 6 y = __ x + ___

76. ## algebra 1

how do you even start to begin how to slope in standard form and slope intercept and point slope cuz i have a test tomrrow on it Although it might be too late for your test, I searched Google under the key words "slope" to get these possible sources:

77. ## help me math

find 25% of 300 300 * 0.25 = 75 75 is 25% of 300.

78. ## Strategy

What are some key financial ratios that would be useful in evaluating strategy for your organization and why? Wouldn't that depend on the organization? I will be happy to critique your thinking .

79. ## DEBATE+ Many opinions needed+thanks

I am writing a debate for school and it is about this statement: “The initial cause of WW1 was the assassination of Archduke Francis Ferdinand of Austria-Hungary.” My stance is that it was a trigger but in order for my to write a debate I need peoples

80. ## math

Solve the system x^2+(y-3)^2-9=0 x+y-1=0 Substitute 1-x for y in the first equation. x^2 + (x+2)^2 = 9 4x + 4 = 9 Take it from there

81. ## Algebra

write the equation of line passing through (6,-10)and (6,-6) I notice that as x is constant, y changes, so it must be a vertical line. x=6

82. ## Social Studies

How did the Spanish-American War change the role of the United States in the world? Im stuck.... http://en.wikipedia.org/wiki/Spanish_American_War Read the section called Aftermath. =) Thanks! Sure helped- Never thought of Wikipedia!

83. ## social studies

why did the british think their military forces were superior to those of the americans? To which time period or war are you referring? ?? The British had an old style of fighting. They fought traditionally in battle lines. The british thought that their

Problem: (x+2)/2x^2+5x+2 + (x-3)/2x^2-5x-3 What I Got: 0 at x=0, one gets 2/2 + -3/-3 which is not zero. You messed up a sign, I suspect. you are right girl

85. ## Please Check my Journal for MacBeth

Running Journal: Macbeth (Act 1 Scene 1) Thunder and lightning; enter three Witches: In the play as a whole, people are tossed about by forces that they cannot control, and so it is in the opening scene. The witches, blown by the storms of nature and war,

86. ## egg protection

how can i protect an from a 6m fall and make it go 3m please look at your question. It makes no sense to us. Repost it

87. ## Language Arts

What goes in a conclusion paragraph? http://nutsandbolts.washcoll.edu/ending.html http://grammar.ccc.commnet.edu/grammar/composition/endings.htm http://leo.stcloudstate.edu/acadwrite/conclude.html from http://leo.stcloudstate.edu/catalogue.html =)

88. ## Strategy

Should both qualitative and quantitative measures be used to evaluate the effectiveness of your strategic plan? Why or why not? Wouldn't it depend on the plan? I will be happy to critique your thinking .

89. ## Critical thinking

What is the meaning of validity, truth, and soundness as they relate to the area of logical syllogisms? Since this is not my area of expertise, I searched Google under the key words "'logical syllogisms' validity truth soundness" to get these possible

90. ## Infusion

Giving 500 mg of medication in 50 ml to infuse over 30 minutes using a 10 drops/ml set would result in administration of __ drops/ min A.16.6 B.23 C.34.5 D.41.6 wouldn't you want 500 drops in 30 min? You are not showing any thinking. I am not going to do

91. ## Math (Homological Algebra)

Does anyone here know how to compute H^3(G,Z) where G is the klein 4 group?

Each element has a different set of energy levels. Use this fact to explain why the colour of the light emitted by an element in the gaseous stare is characteristic of the element? Ive read and researched Quantum physics for over a week now and i still

93. ## Math-Limits

sqrt(1+tan x)-sqrt(1+sin x) lim all divided by x^3 x-->0

Problem: 4x/(x+2)-8/(x-1) What I Got: 4x^2-4x-16/(x+2)(x+1) *I had to simplify the rational expression No. At x=0, it doesn't check. The starting problem gives 8, your answer gives -8. I suspect a sign error somewhere. Probably in the denominator, the x+1

95. ## bobpursly & countiblis,math

I thought that we can solve anything with equations is it always polynomials. Isn't this the same thing as finding the unknown for an equation. As i said in my previous message or am i wrong. Also what about the rational expressions what are some

96. ## pre cal

I'm sorry, i didn't understand what you did. Can you explain it step by step

97. ## Weight Grams

The weight in grams{g} of 1 mM of NaCl is__ a.49.0 b.58.5 c.65.5 d.78.5 http://environmentalchemistry.com/yogi/reference/molar.html

98. ## science

Discuss the importance of each step in the scientific method. Why do you think scientists utilize this type of experimentation and reasoning? (Broken Link Removed) Discuss the importance of each step in the scientific method. Why do you think scientists

99. ## maths help needed!

Hi, just a short question. How do i find the x intercepts for the equation y=-2x^3+1 ? I tried to let y equal zero but i could only get as far as x^3=1/2 please help! x^3 = 1/2 is correct. There is only ine x-intercept. It is where x = (1/2)^(1/3) which

100. ## social studies

By when had Rome expanded include Hispania(Spain) http://en.wikipedia.org/wiki/Image:RomanEmpire_Phases.png from http://en.wikipedia.org/wiki/Roman_empire#Evolution_of_Imperial_Rome On that map, pay attention to the colors and the dates for each color. =)

101. ## Math

THE STUDENTS IN MR HENLYS CLASS PREDICTED THAT IF THEY EACH ROLLED A DIE 90 TIMES THE RESULT OF 1 OUT OF EVERY 6 ROLLS WOULD BE A 5. Each student then completed the experiment which result best supports the prediction of getting a 5 once out of 6 times. (

Problem: (2x+1)/(x^2-16) - (x^2-6x-7)/x^2-11x+28 What I Got: -x^2-3x-3/x^2-16 correct RIGHTAMUNDO WLCM :)