# Questions Asked onJanuary 24, 2009

1. ## chem

The crystal structure of lithium sulfide (Li2S) is pictured here. (Intro 1 figure) The edge length of the unit cell is 5.88*10^2^2 pm. i guess it is FCC ( face cenred cubic) 1-- What are the coordination numbers of and Li^+ and S^2- in the lithium sulfide

asked by Dr Bob plz help
2. ## CHemistry....Please double check DrBobb

What mass of ethylene glycol C2H6O2, the main component of antifreeze, must be added to 10.0 L water to produce a solution for use in a car's radiator that freezes at -23C? Assume density for water is exactly 1g/mL. First we find out the freezing point:

3. ## Math - Exponential Decay

Radium decays exponentially. Its half-life is 1,690 years. How long will it take for a 50-gram sample of radium to be reduced to 5 grams? 1/2P = Pe^(-1690k) (ln1/2)/(-1690) = k 4 x 10^-4 = k 5 = 50e^-kt ln0.1 = -kt ln0.1/-k = t 5,630 years = t ...but

4. ## college Chemistry

Write a balanced equation for the dissolution of sodium carbonate (Na2CO3) in water. Find the number of moles of Na+ produced when 0.318 mol of sodium carbonate dissolves. Answer in units of mol.

5. ## science help

how are well-developed soils similar to young soils? how are they different?

6. ## math

why did the cow want a divorce?

7. ## Poem: Annabel Lee by Edgar Allen Poe

Could you check these answers that go with the poem? Thanks 1. After reading "Annabel Lee," what images linger in your mind. Answer: The images that linger my mind are the kingdom by the sea, her grave by the sea, and the great love the two both shared. 2.

8. ## Urgent Chem help.plz

The crystal structure of lithium sulfide (Li2S) is pictured here. (Intro 1 figure) The edge length of the unit cell is 5.88*10^2^2 pm. i guess it is FCC ( face cenred cubic) 1-- What are the coordination numbers of and Li^+ and S^2- in the lithium sulfide

9. ## Math

Charles's Law states that at constant pressure, the volume of a fixed amount of gas varies directly with its temperature measured in degrees Kelvin. A gas has a volume of 250 mL at 300 K. what is an equation for the relationship between volume and

10. ## Statistics

A sample of 12 measurements has a mean of 24 and a standard deviation of 4.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 24 each. Find the standard deviation of the sample of 14

11. ## Poem: Incident in a rose garden: By Donald Justice

Could someone please check my answers to the poem thanks. 1. How does the gardener recongize Death? Answer: The gardener recognizes death as a dressed spanish waiter. 2. Why is the gardener afraid of Death? Answer: The gardener is afraid of death because

12. ## math

Solve following system of equations? x+3z=-2 2x+2y+z=4 3x+y-2z=5 i need help with few so i can get hang of this math plz. Perform row operations write new matrix [132 -312 2-11| 073] R1+R2 using x,yand z variables write system linear equations represented

13. ## Poem: Hanging fire by Audre Lorde

Could you check these answers thanks. 1. Did you feel more or less sympathy with the girl speaking in "Hanging Fire," than with the one speaking in "Young," explain your answer. Answer: I felt more sympathy with the girl in "Hanging Fire," because she's

14. ## U.S. History

please check if my answer is correct Which was a provision of the Missouri Compromise of 1820 a. Missouri and Maine were denied statehood b. Western territories north of Missouri's southern border were closed to slavery c. Slavery could not spread to any

A sample of 12 measurements has a mean of 24 and a standard deviation of 4.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 24 each. Find the standard deviation of the sample of 14

16. ## earth science

how are well-developed soils similar to young soils? how are they different?

17. ## CHEMISTRY

Select all substances with a hydrogen atom that would participate in hydrogen bonding with an appropriate acceptor atom. (CH3)2CO acetone CO carbon monoxide S8 octasulfur CHClCHCl cis-1,2-dichloroethene CF3CF3 hexafluoroethane CH3COCH3CH2 methylethylketone

18. ## Math - ln

Find ln(1/(√(ab^3)) of lna = 2 and lnb = 3. = ln1 - ln(ab)^(3/2) = ln1 - lna^(3/2) + lnb^(3/2) = 0 - 3/2(lna) + 3/2(lnb) = -3/2(2) + 3/2(3) = 1.5 --textbook answer is -5.5 ... where did I go wrong?

19. ## CHEMISTRY

Select all substances with a hydrogen atom that would participate in hydrogen bonding with an appropriate acceptor atom. (CH3)2CO(acetone), CO(carbon monoxide), S8(octasulfur), CHClCHCl (cis-1,2-dichloroethene),CF3CF3(hexafluoroethane),CH3COCH3CH2

20. ## The writer by Richard Wilbur Poem

Could you please help me I have no idea what this poem means it's so confusing. Thanks for your time. God bless. And could you help me with these questions about the poem. 1. In "The Writer," what is the speaker's daughter trying to write? 2. What does the

1.SOLUBILITY: At 25C, the molar solubility of calcium phosphate in water is 1.1*10^{-7}M. Calculate the solubility in grams per liter. I m not sure how to convert M to g/L MOLAR MASS OF COLLIGATIVE PROPERTIES: 2.tert-Butyl alcohol is a solvent with a Kf of

22. ## chemistry

Benzene has a heat of vaporization of 30.72kj/mol and a normal boiling point of 80.1 C . At what temperature does benzene boil when the external pressure is 445 ? This is how I am solving this problem, but when I enter the answer it says im wrong. Can

23. ## chemistry

The alkanes are a homologous series of compounds containing only carbon and hydrogen that have the general formula . Members of this series include butane (), 2,2-dimethylpentane (), hexane (), and heptane (). The boiling points of some members of this

24. ## Math - Exponential

Tests of an artifact discovered at the Debert site in Nova Scotia show that 28% of the original C14 is still present. Approximately how old is the artifact? 28% = 7/25 (7/25)P = Pe^(-5730k) (ln(7/25))/(-5730) = k 2.22 x 10^-4 = k (7/25)P = Pe^(-kt)

25. ## Math - natural log

Solve for x. (25e^0.1x)/(e^(0.1x) + 3) = 10 e^2.5x / (e^(0.1x) + 3) = 10 e^(2.5x - 0.1x) + 1/3 = 10 e^2.4x = 29/3 ln^(e^(2.4x)) = ln(29/3) 2.4x = ln(29/3) x = 0.945 Is that correct?

How do you find out the coordination number of a crystal? For example im given a picture of the crystal structure of lithium sulfide Li2S. SO i need to find coordination number for: Li^+ S^2-

27. ## U.S. History

please check this The Treaty of Greenville was the result of which of the following battles a. Battle of Ticonderoga b. Battle of Burnt Cabins c. Battle of Fallen Timbers d. Battle of Little Big Horn i picked C

28. ## Math - Compound

If a bank offers interest at a nominal rate of 6%, how much greater is the effective rate if interest is compounded continuously than if the compounding is quarterly? I don't get this question at all... All I'm given is the rate and how am I suppose to

29. ## Urgent Chem Help someone plz

Calculate the mole fraction of the solute in the following aqueous solutions 3.25% ethanol, by volume (d= 0.993 g/ml ; pure C2H5OH, d= 0.789 g/ml )

30. ## Organic Chemistry

Explain why the addition of bromine to trans-cinnamic acid takes place more slowly than the addition of Br2 to a normal alkene like 3-hexene or cyclohexene.

31. ## Poem: Young by Anne Sexton

Could you check these answer thanks so much 1. How do you think the girl in "Young," feels about where she is in her life. Answer: The girl wonders what is coming next in her life because she is full of questions about what's her future going to be like.

32. ## U.S. History

this is one of my questions. i have answered it. please add or make changes to this as neccessary. :) WHO ARE THE ANTI-FEDERALIST?EXPLAIN WHAT THEY BELIEVE IN.WHY DID THEY OBJECT TO THE PROPOSED CONSTITUTION? Anti-federalists were people who opposed the

33. ## DrBob

How would i explain the readiness of allyl alcohol to react with the Lucas test???? Thanks!! ------------------- I still don't understand-- I know Lucas Test is best for tert carbocations but 2-propen-1-ol gives secondary carbocation at best even with

34. ## Algebra

A long-distance call using DEC costs 20 cents for the first minute and 16 cents for each additional minute. The same call, placed on LCS, costs 19 cents for the first minute and 18 cents for each additional minute. For what length of phone calls is DEC

35. ## chemistry

I need help on these questions. They all seem pretty similar i think? i don't know what formula i am suppose to use. And what does nonvolatile mean? is that like a clue or something? 1) 2.6 g of the nonvolatile solute sucrose (C12H22O11) is added to 465 g

36. ## chemistry

A gas has an empirical formula of POF3. If 0.350L of the gas at STP has a mass of 1.62g, what is the molecular formula of the mass? molar mass= 1mol x 22.4L/1mol x 1.62g/0.350L = 103.7g molarmass/empirical formula mass = 103.7g/214.5g = 0.4834 ... how do I

37. ## Chemistry Concept

The iron in steel has a density of 7.86 g/cm3. When iron rusts, it forms hydrated Fe2O3 that has a density of 5.12 g/cm3. What happens to the volume as iron rusts? Like does it expand? contract? stay the same? expand then contract?

38. ## CHEMISTRY PLZ HELP

Select all substances with an acceptor atom that can hydrogen bond to a hydrogen atom that is part of a polar covalent bond. HCCH ethyne Br2 dibromine H2CCH2 ethene CH3Cl chloromethane CH3CH2CO2H propionic acid OF2 oxygen difluoride

39. ## College level math

Suppose you deposit \$100 in an account that earns 0.5% each month. You make no withdrawals from the account and deposit no more money into the account. How much money will you have in the account after 4 years?

40. ## FRENCH

Could you please give me the English translation for "je dormais"(imparfait) and "je dormisse"(imparfait du subjunctif) The translator site gives me "I slept" for both.That couldn't be right, could it??! Merci beaucoup!

41. ## Chemistry

What happens when equal volumes of 0.2M Na2SO3 and 0.2M CaSO3 are mixed? A. Only Na2S precipitates. B. Only CaSO3 precipitates. C. Both CaSO3 and Na2S precipitate. D. No precipitate forms.

42. ## Math 116A

I have been out of school for a very long time and I just enrolled to take some classes online and I am having a lot of trouble with my math. I just cannot seem to understand what it is that they want. Is there anyone that can help me with this. I am

43. ## ENGLISH

how to write a debate? I mean does it have a special form? is it like a letter? what kind of language do you use when writting a debate?

44. ## English

oh I got a terrible hard question for homework and got any qlue how to start it and develop and etc thats it: i ave to write a "debate" to analyse the role of media in Irish society my english teacher gave us pros and cons how to start? and how to match

45. ## Chemistry

When we test for carbon dioxide gas, we bubble it through limewater and get a white precipitate CaCO3. What is the equation for the reaction? Is it CO2 + Ca(OH)2 --> CaCO3 + H2O

46. ## math

Write the equation of line passing through the pints (4,3) and ( -18, 24).

47. ## religious education

for my re homework i need to find 3 facts about each of these churches. orthodox church anglican church baptism in a catholic church baptist church ive looked on several websites but i am still struggling. any help i would be grateful for . thanks

48. ## Chemistry

Sometimes, instead of percentages compostion, you will have the composition of a sample by mass. Using the actual mass of the sample, determine the empirical formula for compounds that have the following analyses. A. a .858g sample of an unkown substance

49. ## algebra

Mandi can be paid in one of two ways: Plan A-- A salary of \$400 per month, plus a commission of 8% gross sales; or Plan B-- A salary of \$610 per month, plus a commission of 5% of gross sales. For what amount of gross sales should Mandi select Plan A? I

50. ## U.S. History

please tell me if these are right or not. my choice are in CAPS 1. the Antifederalists opposed the Costitution becasue they thought it a. gave the federal government too much power B. PROVIDED NO WAY TO CHANGE THE CONSTITUTION c. gave the state governments

51. ## chemistry

So this is the case: liquid methanol, CH3OH is being prepared to be poured into a beaker of water. (THERE CAN BE MORE THAN ONE ANSWER FOR Q1-3) 1) What intermolecular forces are broken in the methanol when these substances are mixed? -hydrogen-bonding

52. ## ETH125

Post a current issue between Native Americans and the Federal government. Identify the legislation that you think is linked to the issue, and explain why you think there is a connection.

53. ## Math - logs

log_3(2x - 1) = 2, Find x. Here's what I've done: log_3(2x) * log_3(1) = 2 log2x/log3 * log1/log3 = 2 trial and error... log2 (2*1.4)/log3 * 0 = 2.03... x = 1.4 I think I did it wrong because anything that multiplies with 0 gives you 0...

54. ## English

I need help with this homework: Present Perfect vs Present Perfect Progressive: Choose the best answer. (In some sentences, both answers are acceptable.) 1. I’ve never (been making – made ) more than \$500 a week. 2. He’s always (wanted - been

55. ## human resources

As the company bookkeeper reviewing delinquent accounts receivable, you find that a relative of yours has not paid his account amounts of \$550. You know that he has been experiencing financial difficulties, and so you set his account aside and do not

56. ## Biology

How is sex (gender) determined in mammals? I was thinking that if the male gave over an X chromosome that the baby would for sure be a male because males have XY and if the male gave over an X then baby would for sure be a female because all females ar XY.

57. ## nutrition

what is protien?

58. ## geography

what is person suitability? (i copied it down wrong in a note)

59. ## writeacher- religious education again!

sorry to be a pain and ask for help again . i am still struggling with 3 facts about the anglican church, 3 facts about baptist church , 3 facts about the orthodox church. the only thing i have found is that Anglican means `of England` ive tried what you

60. ## math

write the equation of the passing through the point (6,-8) and perpendicular to the line y=(-5/8)x+25.

MY QUESTION IS ABOUT HEALTH... I HAVE A MIDTERM DUE MONDAY 01/26/2009.. AND I REALLY DON'T KNOW HOW TO START IT I HAVE TO USE I,ME,MY STATEMENT ONLY... HOW CAN I START MY MIDTERM??..PLEASE HELP!!??

ln(a² − b²)

63. ## computer graphic

This term deals with the difference between the lightas and the darks of an image" a value b tones c contrast d variable brigthness comparisonal testing is it "c"

64. ## Chemistry

How would i explain the readiness of allyl alcohol to react with the Lucas test???? Thanks!!

65. ## Psychology

Jennifer is a 29-year-old administrative assistant married to Antonio, an Italian engineer, whom Jennifer met four years earlier while on a business trip for her marketing company. The couple now lives in Nebraska, where Antonio works for the county's

66. ## Math

A(-11,8)B(2,-6) and C(-19,-8) are the vertices of Triangle ABC. N(X,Y) is a point on AC such the BN is Perpendicular to AC. Find Area of Triangle ABC. PLEASE HELP!!!

67. ## CHEMISTRY PLZ HELP

Select all substances with an acceptor atom that can hydrogen bond to a hydrogen atom that is part of a polar covalent bond HCCH (ethyne), Br2 (dibromine), H2CCH2 (ethene), CH3Cl (chloromethane), CH3CH2CO2H (propionic acid), OF2(oxygen difluoride)

68. ## factor completely

125c^3 + 729x^3 (5c)^3 + (9x)^3 (5c + 9x)(25c^2 - 45cx + 81x^2) Is this correct?

69. ## history

Can anyone help me ?? George W. Bush's victory in presidentaial election of 2000 was finally decided by who??

70. ## U.S. History

please check this The War of 1812 end with a. a clear victory for the United State b. a clear victory for Britain c. the removal of all British claims to land in North America d. a return to the pre-war boundaries between United States and British

71. ## CHEMISTRY

Select all substances with an acceptor atom that can hydrogen bond to a hydrogen atom that is part of a polar covalent bond HCCH ethyne Br2 dibromine H2CCH2 ethene CH3Cl chloromethane CH3CH2CO2H propionic acid OF2 oxygen difluoride

72. ## Algebra

Okay, i need help. I'm solving linear equations in intermediate algebra. My problem is that I never know which number to subtract first. Ex: 5y-8=-18 To get the right answer (-2), they move they add the 8 to both sides. But on 27w-64=-37 They move the 37

73. ## math

Explain the difference between the slopes of two parallel lines and the slope of two perpendicular lines.

74. ## U.S. History

i really need help with this essay question Explain How The Issues Of "Gold, Glory and God" Influenced Not Only The Colonizing Activities Of Spain And England But Also The Economic Gain And Glory For All Individuals Involved/ please help if you can

75. ## english

i have to keep a language learning diary and i am a bit confused.I have to write a tas description and a goal.what is a difference,can someone give an example?

76. ## English

Debate the motion that the media has too much power in our society...

77. ## Histoty

Ok I would like you to read this source and explain what does it mean and why is it wrong based on a my history Question : How far can you prove that Source G is wrong? Source G The greatest danger and the one which threatenes to destroy Europe is not

78. ## Economics

Jim signed a new deal for \$10 million with the Toronto maple leafs. THe terms of the contract were 1 million immediately and 800,000 per year for the next 5 years (first payment after 1 year) and \$1 million per year for the next 5 years (first payment at

80. ## computer graphic

this is the term for an images resolution specifically when dealing with prints. a Megapixel b screen resolution c filter resolution d DPI i guess its "a" but i am not sure. plz help thanks

81. ## U.S. History

can someone help me with this one Jefferson's election as President in 1800 demonstrated that a. the country could peacefully transfer power from one party to another b. the Constitution needed to be reformed c. there was no need for a two-party system d.

82. ## Calculus II

Can someone help me with this problem? Find f if f''(x) = x^-2, x>0, f(1)=0, and f(2)=0. I tried using antiderivatives but I realized I couldn't take the antiderivative of x^-1.

83. ## algebra

factor: 9w - w^3 = 3w(3-w^2) m^4 - n^4 = (m-n)^2(m-n)^2 are these correct? the next few I wasn't sure how to work... factor: 2h^2 - h - 3 = 0 x^2 - 36 = 0 x^3 = 4x

84. ## U.S. History

1.in what ways did the colonies and Britain benefit from triangular trade? 2.Name two places enslaved Africans were sent to and what types of crops were cultivated in each place for the second one i got West Indies:sugar, molasses and North America: rum,

85. ## U.S. History

please check this how did the Nationalists regard Shay's Rebellion? a. as proof that the states had too little power b. as an example of how governments abuse their power c. as proof that only a strong national government could prevent social disorder d.

86. ## calculus

A question on my math homework that I can't seem to solve... Rotate the region bounded by y=x^2-3x and the x-axis about the line x=4. Set up the integral to find the volume of the solid. I'm pretty sure that the integral is in terms of (dy), and has bounds

87. ## need ideas on science fair project!!

im doing a science fair project on teeth.... and i need ideas. i hve already tried what kind of soda affects the tooth most, and i need more ideas! plz help!!

88. ## music

in music i need to find out about Poulenc. his date of birth- 7th january 1899 when he died- 30th january 1963 what nationality- Paris , France his musical group - Les Six are these answers right. thankyou for the help

89. ## Afghan Culture

What is he significance of the burqa, face veil, and hajib?

90. ## Factor Completely

25x^2 - 60x + 36 highest number they all go into is 1 so would this be Prime?

91. ## english

There is one more thing which is not 100 % clear to me. I am still writing my learning diary and have to write about my emotional temperature.I've googled it but still I am not sure what it is

92. ## Science

What kind of soda affects teeth most? -MC

93. ## Chemistry

I saw this sentence,"Most metals are strong and can be hit without breaking because they are HARD." But aren't pure metals soft and weak? Why do we still say they can be hit without breaking because they are hard?

94. ## Afghan Food

What is a typical afghan diet?

95. ## Chemistry

A student determined that ethanol was the best solvent to use for a recrystallization based on small scale trials. When the recrystallization was carried out on a larger scale, no crystals were obtained on cooling the hot solution. Why? and how would you

96. ## human services management

does anyone know how to calculate fixed costs, variable costs and break even points on balance sheets, cash statements and income statements?

97. ## physics

if a bean of mass 2.0 g jumps 1.0 cm from your hand into the air, how much potential energy has it gained in reaching its highest point? What is its speed as the bean lands back in the palm of your hand?

98. ## Science

Why is it that cats and dogs don't have just one or two children in a litter like humans do? Why do they have 6-9? Thanks -MC

99. ## factor completely

c^2 + 3/2c + 9/16 (c + 3/4) (c + 3/4) (c + 3/4)^2 Is this correct?

100. ## factor completely

6h^2 + 45h - 24 3(2h^2 + 15h - 8) 3(2h^2 + 1h + 16h - 8) 1h(2h + 1) + 8(2h + 1) 3(2h + 1) (1h + 8) Is this correct?

101. ## Math - Exponential

Evaluate [(26 + 37)/121]^(3/2) = [(2√27)^3 + (2√36)^3] / [(2√121)^3] = [(2√27)^3 + 6] / 1331 and now... I don't know what to do... the answer is (189/1331)(√7)... BUT I don't know how to get this! Please help me! Thanks.

102. ## physics, fluids

would I be correct if I explained the 3 expressions in Bernoulli's equation as representing: P is the pressure 1/2*rho*v squared is the kinetic energy rho*g*h is the gravitational kinetic energy. Or is it more complicate than that. Thanks

103. ## U.S. History

i have a map that shows the Electoral Vote in 1792 it shows each state and has a number in front of it like: NY(12) how do i figure out how many representatives NY had in the Senate and in the House of Representatives using this map??

104. ## algebra

how do you do a problem like this: (by the way ^ sybols a placement of an exponent ex. f^3 f is the variable and 3 is the exponent) (k^2e)^2 ________

105. ## algebra

how do you do a problem like this: (k^2e)^2 ________

106. ## computer graphic

This control on the Layers Palette in Photoshop changes the selected layer, allowing to show through from underneath. a See-through b transparency c saturation d color mode i am little confused between a and b...

107. ## Factor Completely

2t^2 - 18t + 5t - 45 2t(t - 9) + 5 (t - 9) (t - 9) (2t + 5) Is this correct?

108. ## math

Write the equation of the passing through the point (6,-8) and parallel to the line y=-(5/8)x+25?

109. ## Factor Completely

I used the U-subsitution (x + 1)^2 - 11 (x + 1) + 24 u^2 - 11u +24 (u + 3) (u - 8) should this be (u - 3)? (x + 1 + 3) (x + 1 - 8) (x + 4) (x - 7) or should it be (x - 2) Can anyone explain which is the correct answer thanks

110. ## sci230

Piecing It Together on p. 78 of the text describes the six major concluding principles Mendel hypothesized from his work. Describe three of them.

111. ## math

find the absolute minimum of f(x) = x - ln x

112. ## science

how does a low voltage thermostat work?