# Questions Asked onJanuary 31, 2008

1. ## math

Replace each letter with a number to make the problem correct. Identicle letters are placed with identicle numbers. PARTS x 4 = STRAP

2. ## science

iron (III) oxide is formed when iron combines with oxygen in the air. how many grams of Fe2O3 are formed when 16.7g of Fe reacts completely with oxygen? 4Fe(s) + 3O2(grams) => 2Fe2O3(s)

3. ## Chemistry

Liquid Butane, C4H10, is stored in cylinders to be used as a fuel. Suppose 39.3g of butane gas is removed from a cylinder. How much heat must be provided to vaporize this much gas? The heat of vaporization of butane is 21.3 kJ/mol.

4. ## math

Simplify the expression (x to the fourth power times x cubed)squared/x to the 4. a)x b)x to the fifth c)x to the tenth d)x to the 20 I kind of confused. I tried to divide by 4, but i couldn't get anything. I need help?

5. ## Calculus

L'Hospital's Rule Lim(lnx)^(x-1) x->1+ This is what I did so far... Form: 0^0 ln(lnx)/ (1/x-1) ----------------------------------- I am not sure if you could use L'Hospital Rule (as stated in the instruction)for the 2 problems below: lim

6. ## Chemistry

Thermal Decomposition What is the ratio of moles of CuO produced per moles of malachite decomposed? I have 0.004522431/0.01257071 but am not that confident that I am going the right direction. Can any one tell me if I am going in the right direction or do

7. ## Physics

Two charges 10uC (point A) and -10uC (point B) are placed 10cm from each other. Find the electric field at a point P perpendicular bisector of AB at a distance 12cm from the middle. Can someone get me started on this one? I'd appreciate any help. Thanks

8. ## Chemistry

How many liters of O2 are needed to react completely with 45L of H2S at STP? 2H2S(g) + 3O2(g) --> 2SO2(g) + 2H2O(g)

9. ## SRAjMcGin

19. (A) The wealthiest he is, the most selfish he is. (B) Wealthiest he is, most selfish he is. (C) Wealthier he is, more selfish he is. (D) The wealthier he is, the more selfish he is. 20. (A) Social workers used to taking care of old people. (B) Social

10. ## Economics

What is the formula for CPI consumer price index? and how it is use to calculate prices?

11. ## economics

how to calculate the cpi for a given market basket, with given year and prices?

12. ## chemistry

when iron rusts in air, iron(III) oxide is produced. how many moles react with 2.4 iron in the rusting reaction? 4Fe(s) + 3O2(g) => 2Fe2O3(s)

13. ## chemistry

aluminum reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. how many grams of aluminum sulfate would be formed if 250g H2SO4 reacted with aluminum?

14. ## chem

how many liters of chlorine gas can be produced when .98L of HCl react with excess O at STP? 4HCl(g) + O2(g) => 2Cl(g) + 2H2O(g)

15. ## Chemistry

Is there someone out there that can tell me if I answered this right or if I need to study some more? Thanks What is it that makes water such a good solvent for polar substances? Why is it called the universal solvent? Water is such a good solvent for

16. ## american literature

What does Walt Whitman mean honeyed morphine on line 27 of the poem myself

17. ## sci

what are the types of renewable energy alternative? what are some challenges with using and managing these alternative, renewable energy resources?

18. ## math

how many fluid ounces are there in 2 gallons of milk? a)256 b)128 c)64 d)8 I think the answer is a. Is it right?

19. ## math

35 minutes = _____ hours (fraction) is the answer 1 5/12

20. ## Stiochiometry

Carbon dioxide is released into the air from the combustion of octane (C8H18). How much octane will you need to get 5.00 moles of carbon dioxide? What is the mass of the octane?

21. ## math

ARE KELVIN TEMPERATURES EVER POSITIVE WHEN CELSIUS TEMPERATURE ARE NEGATIVE? IF SO FOR WICH CESIUS TEMPERATURE? IF THIS NEVER HAPPENS,EXPLAIN HOW YOU KNOW

22. ## math

if a stereo original cprice was 20.80 and it is now 13.75 what percent is the discount?

23. ## english

analogy brother mother fly ?

25. ## chemostry

How do I convert 0.058 M to mL? The answer is 3.34 mL. How do I get that? the molecular weight is 60 g/mol and the density is 1.049 g/mL Note: M is molarity(moles/Liter)

26. ## biology

cross a homozygous running, homozgous black mouse with a heterozgous running brown mouse.

27. ## chemistry

in 2CO(grams) + O2(grams) => 2CO2(grams), what is the ratio of moles of oxygen used to moles of CO2?

28. ## Chemistry

A gas initially at 20C must be changed to ? C to triple the pressure.

29. ## chem

The total pressure in a flask containing air and ethanol at 257C is 845 mm Hg. If the pressure of the air in the flask is 762 mm Hg, the vapor pressure of ethanol is ? mm Hg.

30. ## chemistry

The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 400C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at

31. ## AP CHEMISTRY

how do i calculate theoretical yield?

32. ## Chemistry

When a student plotted ln [vapor pressure of a gas] vs. inverse Kelvin temperature, she obtained a straight line with a slope equal to -8.000 x 10^3 K. According to the Clausius Clapeyron equation, Hvap is ? KJ/mol

33. ## International Child Labor

I need links and examples of international child labor for this mini essay. The country has to be third world or a developing country. I do not want Western Europe, Canada, Australia/New Zeland, or Japan because of course they are very advance.

34. ## orientation

Who said, "Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that."

36. ## orientation

Most of the pure Meth made and brought to the U.S. is made in

37. ## english

When a boy becomes a teenager, he often wants to show his independence. What is the personal pronoun and antecedent in this sentence?

38. ## orientation

Who said, " The Mind Once Stretched by a New Idea will Never Return to its Original Dimension."

39. ## AP Chem

which would be the limiting reagent in the reaction: 2H2(g) + O2(g) => 2H2O(g) 1. 50 molecules of H2 or 2. 50 molecules of O2

40. ## orientation

T/F In the Cultural Diversity Presentation, Mark Twains quote implied that in order for us to not be so narrow-minded we must travel outside our usual boundaries.

41. ## Chemistry

A 35.8f sample of cadminum metal was melted by an electric heater 4.66 J/s of heat. If it took 6.92 min from the time the metal began to melt until it was completely melted, what is the heat of fusion per mole of cadminum?

42. ## Chemistry

Write the structure for the alkane: molecular mass = 72 u; forms four monochlorination products. Well since its 72u and its an alkane, I figured out that the formula is C5H12. But what does it mean that it "forms 4 monochlorination products"?

I NEED TO MAKE A PROJECT ON BUSINESS STUDIES BUT I AM UNABLE TO DECIDE AS TO WHAT TOPIC I SHOULD CHOOSE AND WHERE DO I GET THE REQUIRED INFORMATION(SITE)

44. ## math

Factor (15a squared bc squared -9a squared b to the fourth c) by finding the gcf. I think the answer is 3abc(5ac-3ab3). I got it because I found the gcf of the coefficents which are 3. I subtracted one from each exponent so, i canceled b from 15a squared

45. ## Chem

For the autoionisation of water, it looks like 2H2O(l)-> H3O+(aq) + OH–(aq) I thought that becuase it is going from liquid to ions, wouldnt the Entropy be greater than 0? However, I have been told and I have calculated the opposite, that entropy is less

46. ## math

A figure is transformed into a new figure by being rotated 180 degrees, translated left 6 units, and dilated by a factor of 4. How are the old and new figures related? a)both congruent and similar b)congruent but not similar c)similar but not congruent

47. ## To mk-tintin

Please note that several of the Jiskha teachers can read French. :-)

48. ## science

what happens when a candle is alight?

49. ## AP CHEM

hwo do i calculate theoretical yield?

50. ## research paper

I am writing a research paper. The corrlation between interest rates and credit card usage. I cant find many websites on this do you know of any?

51. ## math

Given f(x) = x2 + 3x – 3, find f(0).

52. ## hypatia of alexandria

I'm doing a report on Hypatia of Alexandria (just in case you don't know her, she's the first ever known female mathematician), and I need at least one humorous or bizarre fact about her, but I can't find one (I only found one about mathematicians back

53. ## math

can someone check and see if i did this right An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid? 100=128/800*100 128/800=6.25 6.25*100=625

54. ## electricity

which of the following frenquencies falls in the range of RF waves used by commercial radio broadcasting stations

55. ## math

doesnt (-) make the numbder postive like (-10)=10 and (-7)=7 that's right

56. ## Math

Eight people are put into pairs and enter a room with a large table with four pairs of chairs (2 chairs and a lot of space then 2 more chairs and a lot of space and so on) Though they could sit anywhere they had to sit with there assigned partner. In How

57. ## Math

I need help solving this logarithmic function: x = log3(4^3).

58. ## chemistry

if 8.6L of H2 reacted with 4.3L of O2 at STP, what is the volume of gaseous water collected (assuming none of it condenses)? 2H2(g) + O2(g) => 2H2O(g)

59. ## chemistry

how many grams of CO are needed to react with an excess of Fe2O3 to produce 209.7gFe? Fe2O3(s) + 3CO(g) => 3CO2(g) + 2Fe(s)

60. ## math

how do I find the slope of (0,5)(5,0) any help would be great.

61. ## math help

can someone show me how to find the slope of this one too (-5,3)(5,3) thanks so much

62. ## Science

What is the only continent that traces of ancient human life have not been found?

63. ## math

Find the slope and y-intercept.-2x + 3y = 21

64. ## Economics

A firm and a worker interact as follows. First, the firm can make 2 contract offers (wage, jobtype): (w, z=0) and (w, z=1) where z=0 denotes the "safe" job and z=1 denotes the "risky job. After observing the firm's contract offer(w,z) the worker accepts or

65. ## Chemistry

Liquid Butane, C4H10, is stored in cylinders to be used as a fuel. Suppose 39.3g of butane gas is removed from a cylinder. How much heat must be provided to vaporize this much gas? The heat of vaporization of butane is 21.3 kJ/mol.

66. ## Chemistry

for the reaction 2Na(s) + Cl2(g) -> 2NaCl(s), how many grams of NaCl could be produced from 103g of Na and 13L of Cl2 (at STP)

67. ## caculator

how do you do "choose" on ti-83 calculators? like 5 choose 4

68. ## economics

what is studied in microeconomies?

69. ## algebrA

ln(x+1)-2ln(x+2) Ive finished all of this wksht except for this question...help please

70. ## Com 135

Read the following scenario: As a customer service manager for a local software development company, you want to create a user manual for one of the software applications your company develops. The purpose of the manual is to support your customers in

71. ## science/law of conversation of mass

is the law of conversation of mass a reason why actual yield is less than theoretical yield?

72. ## science

when sedimentary rock is buried it may change into metamorphic rock. describe two causesof this change.

73. ## chemistry

HOW CAN YOU TELL JUST BY LOOKING, IF A MIXTURE IS MOST LIKELY HOMOGENEOUS OR HETEROGENEOUS?

74. ## science

i need 5 sentences on explaining the different types of symbiotic relationships that we see with the farmer ants, the leaves, and the fungus.

75. ## chemistry

couple theory questions i don't quite understand... What is vapor pressure ad why does it change with temperature? and... The assumption was made that slight changes in the depth under the surface of the water will not significantly change total pressure

76. ## management of Information Systems

Create a table that list the strengths and challenges of traditional systems development life cycle, prototyping, rapid application development, and end user system development life cycle."

77. ## chemistry

what are the reasons why the Cu(II) solution has to be titrated immediately after addition of KI?

78. ## Chemistry

For the autoionisation of water, it looks like 2H2O(l)-> H3O+(aq) + OH–(aq) I thought that becuase it is going from liquid to ions, wouldnt the Entropy be greater than 0? However, I have been told and I have calculated the opposite, that entropy is less

79. ## social studies

what is the area of the shang dynasty!!

80. ## fornt class

what are the steps of the registration process form the viewpoint of front desk agent?

81. ## math

to convert from F to C we use this formula. (c)=(f-32)*5/9 using this formula,convert 85 F to celsius rounded to the tenth place

82. ## SraJMcGin

bonjour je suis étudiant français et j'aurais besoin de votre aide. C'est pour un questionnaire et je n'ai pas de correction. Pourriez vous me donner les vraies réponses quand vous aurez du temps libre svp. c'est à partir de la page 7. Cordialement,

83. ## SraJMcGin

14. “pattern” (line 21) means: (A) design (B) formula (C) link (D) obligation 15. “focus on” (line 35) means: (A) concentrate one’s attention on (B) study the behaviour of (C) supervise the activities of (D) impose living conditions on 16.

84. ## SraJMcGin

24. (A) Old people need looking after more than children. (B) Old people need to be looking after more than children. (C) Old people needs be looked after more than children. (D) Old people need being looking after more than children. 25. (A) He has lived

85. ## SraJMcGin

28. China is overpopulated, …. is worrying. (A) that which (B) what (C) how (D) which 29. Italy is …. considered as a family-oriented country. (A) not longer (B) no longer (C) not more (D) no any more 30. Most countries …. find new solutions. (A) are

86. ## SraJMcGin

36. …. he lives in a cold, ill-equipped house, he refuses to move. (A) In spite (B) Although (C) Despite (D) Whereas 37. It is too difficult …. live alone. (A) to them to (B) to them (C) for them (D) for them to 38. They have two daughters …. refuse

87. ## New Nationalism

How did new nationalism respond to industrilization?

88. ## AP US History

I have and essay on why muckrakers were better than roosevelt thought. i have examples of muckrakers. i just need to find out what legislation or action their works promoted. Here is the list of muckrakers... Lincoln Steffens Ida Tarbell Ray Bakers John

89. ## World History

What was the cause of the split between Sunni and Shiite Muslims?

90. ## Algebra

1.The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C=6000/200-2x. a.What is the cost to remove 75% of the pollutant? Answer: \$30.2 million dollars b.What is the cost to remove 90 % of the pollutant? Answer: \$30.27 million

91. ## pets

i wanna try to get my adorable rare chinese dwarf hamster on a bag of pet food or something. everywhere i try to find out stuff its always wut i don't want. could you plz help me. thx in advance!

92. ## math

sum of two numbers is 42.Their difference is 6.What are the two numbers?

93. ## inequalities

A home-based company produces both hand-knitted scarves and sweaters. please help please The scarves take 2 hours of labor to produce, and the sweaters take 14 hours. The labor available is limited to 40 hours per week, and the total production capacity is

5y+2=2y-11

95. ## math

Solve the system by addition. 4x + 6y = 9 8x – 3y = –7

96. ## mk-tintin

Mon ami, les profs ici sont ici pour AIDER mais pas pour FAIRE les devoirs des étudiants. Nous voulons vous aider mais il faut que vous fassiez un effort d'abord. Mme

97. ## physics

The average power dissipated in a stereo speaker is 56 W. Assuming that the speaker can be treated as a 4.0- resistance, find the peak value of the ac voltage applied to the speaker.

98. ## English

Has anyone read the novel, "A Separate Peace". If so give me a response and I have a question about the novel! Thanks :) Miley

99. ## Chemistry

Can someone tell me if I am doing this problem right or if I need to start over? Thanks. pH = -log [H+] = -log (0.10) =1 The pH of 0.10M HCI solution is 1.

100. ## ?

what does "j/w" mean?

101. ## Language Arts

How do I write a GOOD A+ persuasive essay about Iraq and why we shouldnt be there? I need some facts and a topic sentence and a story in the intro with a question. Then in the conclusion a umm call to action and all that. PLEASEE HELP ME! ITS DUE TOMORROW!

102. ## University

Will I get a conditional offer to McMaster in the first round? The following is the admission for Commerce I to McMaster: "Grade 12 U/M course requirements: * English U * Advanced Functions 4U * One of: Calculus & Vectors 4U or Mathematics of Data

103. ## chemistry conversion

how do I convert 0.058 M to mL? Note: M is molarity(moles/Liter) also the molecular weight for the equation is 60 g/mol Thank you. It has been a while so I forgot how to do this.

104. ## Chemistry

I cannot find information that gives me a clear answer whether NaBr is an electrolyte or non electrolyte. I have found some information that K2SO4 is an electrolyte, but now I am doubting that. All of my others I have been able to find solid information

105. ## biochemistry

List 4 different ways in which the function of hemoglobin could be changed by a single amino acid substitution. and i cant think of a single way because this question doesnt elaborate much further... can someone please help?

106. ## poetry

For AP Literature, I have to write a 2 page (double spaced) paper analyzing how the painting Nude Descending a Staircase by Marcel Duchamp and the poem of the same name by X. J. Kennedy have a successful connection. What is a good place to start and what

107. ## grammar

can you use the words "you and me" in a sentence.

108. ## algebra 1

The Question Writing Commitee consists of seven volunteers from around the country who are amazingly dedicated to the Mathcounts program. This past weekend, was the last meeting for this particular group of question writers. Before the meeting, they are

109. ## math

Boris gets paid an 8% commission on every car he sells. Last week, he made a commission of \$1240. What was the price of the car he sold? a)15500 b)15000 c)12500 d)1550 I got answer a by dividing 1240 by .08. Is this right?

110. ## math

Which is equivalent to the expression (a squared + a to the fourth power) to the 0 power? a)0 b)1 c)a to the 6 power d)a to the eigth power I got answer a by adding 2 and 4 and multiplying it by 0. Is this right?

111. ## math

A crated full of sugar cubes has a volume of 3 cubic ft. The volume of each sugar cube is 0.5 cubic inch. How many cubes are in the crate? a)432 b)1728 c)5184 d)10368 I need help with this question.

112. ## math

A figure is transformed into a new figure by being rotated 180 degrees, translated left 6 units, and dilated by a factor of 4. How are the old and new figures related? a)both congruent and similar b)congruent but not similar c)similar but not congruent

113. ## Math

21 3/14 how would I round that to the nearest 1/5inch

114. ## math

what is the gcf of 8x squared y, 12x to the fourth y to the fourth, and 20x cubed? a)8x squared y b)4x squared y c)8x squared d)4x squared I don't have an answer. The gcf is 4. I think the answer is either b and d. Which one is it?

115. ## math

factor (15a squared bc squared -9a squared b to the fourth c) by finding the gcf I think the answer is either 3abc(5ac - 3a cubed) or 3a squared bc(5c - 3b cubed) Am i on the right track?

116. ## math

A transversal intersects two parallel lines and forms eight angles. Which of the following statements is false? a)alternative interior angles are always congruent. b)corresponding angles are always congruent. c)adjacent interior angles are always

117. ## math

Travis walked 20 yards north from the swing set to the slid. He then went 30 yards east to get a drink of water. From there he ran 40 yards south to play basketball. Finally, he ran 30 yards west to his bike. How far was hisbike from the swingset? I came

118. ## math

line xy is translated 3 units to the left. if a point on line xy is located at (2,11), where would the equivalent point be on line X and Y prime? a)(2,14) b)(2,8) c)(-1,11) d)(5,11) I'm not sure but i think the answer is b or c. am i right?

119. ## math

Patrick has a summer job passing out flyers for a store. Each flyer weighs about 0.55 ounce. If he is given a bundle of flyers that weighs 16.5 lbs, how many flyers must he pass out? a)105 b)300 c)480 d)560 I think the answer is b. Is it right?

120. ## math

need help to solve the following ploblem, and like problems: 5 minutes = _____ hours (what is the fraction) I'm in the 5th grade

121. ## Chemistry

List 4 different ways in which the function of hemoglobin could be changed by a single amino acid substitution. i have no sweet clue... the question is very vague

122. ## chem

The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 400C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at

123. ## chem

When a student plotted ln [vapor pressure of a gas] vs. inverse Kelvin temperature, she obtained a straight line with a slope equal to -8.000 x 10^3 K. According to the Clausius Clapeyron equation, Hvap is ? kJ/mol.

124. ## introduction to psychology

Every morning, as she prepares for her two-hour drive to work, Carole gets a headache,identify the stressor in this situation.

125. ## english

what is a synonym for the word allusion?

126. ## vocab

Are ther any words that end with the letter WH?

127. ## science

what are food webs?

128. ## socialstudies

what is a family?

129. ## Comp - Citing

I wrote a critique and had to include a works cited page. I didn't use quotes or anything. I just summarized what was said in reading. Where would I cite the book?

130. ## Chemistry

I am totally confused. Does my answer make sense or do I need to start over? The more I read it the more I doubt my answer. I am also confused when it states Please be specific. Is it looking for a specific number for the temperature and pressure or just

131. ## music

Why is P-Funk such an important element in the development of funk and hip hop?

132. ## pets

i want my hamster to be famous. but i don't know how could you give me some site to sign up or something

133. ## math 12

i know how to do the majority of these type of questions, but i don't know how to simplify this one all the way.. 8(2x-1)^3= 125 i know you could go (2x-1)^3= 125/8 (2x-1)^3= (5/2)^3 but how can i simplify any further, and yes there is an answer.

134. ## Math

The fourth largest is the Arctic Ocean. If P over 12 (p/12) stands for the approximate area of the Arctic, then what is the approximate area of the Arctic?

135. ## Chemistry - Equations

I am a student in the ninth grade and I need help with the following problems because I do not understand how to do them. I appreciate your help and thanks once again. 7. in 2CO(grams) + O2(grams) => 2CO2(grams), what is the ratio of moles of oxygen used

136. ## Chemistry

The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. If the pressure of the air in the flask is 762 mm Hg, the vapor pressure of ethanol is mm Hg.

137. ## chemistry

A sample of O2 gas is placed in a sealed 1.00 L flask and pressure is measured as temperature is changed. The data are plotted and the slope of the resulting line is equal to 0.00500 atm/K. The line passes through the origin of the graph. There are g of O2

138. ## chemistry

A gas initially at 30C must be changed to ? C to triple the pressure.

139. ## math

line xy is translated 3 units to the left. if a point on line xy is located at (2,11), where would the equivalent point be on line X and Y prime? a)(2,14) b)(2,8) c)(-1,11) d)(5,11) I think the answer is c. What I did is move the point 3 units to the left

140. ## history

What was the date texas declared its independence?

141. ## math

A transversal intersects two parallel lines and forms eight angles. Which of the following statements is false? a)alternative interior angles are always congruent. b)corresponding angles are always congruent. c)adjacent interior angles are always

142. ## Chemistry

When a student plotted ln [vapor pressure of a gas] vs. inverse Kelvin temperature, she obtained a straight line with a slope equal to -8.000 x 10^3 K. According to the Clausius Clapeyron equation, Hvap is ? kJ/mol.

143. ## Chemistry - Acid Base Titration

When you complete a acid base titration of NaOH and HCl and how to you find the molarity/concentration of HCl. I used 9 mL of HCl with 50 mL of water. But when solving for concentration, do I use 9 mL or 59 mL (water + HCl)? Also, does the water in the HCl

144. ## french

what does "Notre Pere Je Vous Salue Marie" mean