# Questions Asked onFebruary 5, 2007

1. ## calculus plz heLP

can someone please prove the difference rule to me? d/dx[f(x)-g(x)]=d/dx f(x)- d/dx g(x) Go to the definition of a derivative: Lim x>0 of {f(x+deltax)-f(x)]/deltaX

2. ## geog

Why does each time zone extend 7 1/2 degrees on each side of central meridian rather than extending from 0 degrees to 15 degree? http://www.google.com/search?q=time+zones+latitude&ie=utf-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a There are

3. ## the awakening

In "The Awakening" by Kate Chopin, what is the "gangrene passion"? http://www.pagebypagebooks.com/Kate_Chopin/The_Awakening_and_Selected_Short_Stories/The_Awakening_Chapter_V_p1.html Use Ctrl + F and enter the word gangrene to find the passage. Read the

4. ## Chemistry

How many grams of NaCl (molar mass = 58.4 g/mole) must be added to 12.0 g of water (molar mass = 18.0 g/mole) so that Xwater = 0.725? My answer was 102.69 grams of NaCl. However my friend got 14.8 grams of NaCL. We are not sure who is right? Please

5. ## Calculus (easy)

h t t p : / / img . photobucket . c o m / albums / v166 / stuffy1 / Mathhwforjonrevisedwithoutnotes . j p g Nix the spaces! Figured myself. It was A.

6. ## history

What do you associate a country's identity? Provive an example to help me understand please! Maybe what sort of things do you associate with a country. Maybe you think of their produce, the wars they fight, or the leader who runs the country. For example,

7. ## history

What factors/influences help shape a country's identity? How does the leadership/government of a country generate consensus for this identity? Thank you for using the Jiskha Homework Help Forum. Here are some things to consider: language, technologies,

8. ## Equations Question

A mother is twice as old as her daughter now, but ten years ago, she was 3 times as old as her daughter. Fins their ages at present. I tried to form an equation: 2x-10=3x, but that didn't work. Could someone help me forma working equation for it, and I can

9. ## history- please respond ASAP

What did Harding want to do to return America to "normalcy"? Here are his words: http://www.vlib.us/amdocs/texts/34hard1.htm I think it was Meneckin who said "Normalcy" is a return to the good old days what never were. Harding led the US back into

10. ## chemistry

The balanced equation doesnt seem to help because the thiosulfate is not in the equation, I think it is preventing the reaction from going backwards. THe equation is: 2iodide ion + hydrogen peroxide + 2 H3O --> elemental iodide + 4 H2O within the reaction

11. ## history

What acts brought the United States into World War 1? http://en.wikipedia.org/wiki/World_War_I Read the section on causes. =)

12. ## history

What would have happened if the United States had not entered World War 1 on the side of the Allies? Read the prior link I sent, and do a little guessing -- play the "what if" game. Let us know what you think, and someone here will be happy to critique

13. ## physics

Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.

14. ## chemistry

Look at gold. It has an atomic number of 79. Adding 1 proton would make it have 80 protons and that element (from the periodic table) is mercury. Look up the prices of Au and Hg and compare. Frankly, I would rather have Au (a solid) than Hg, (a liquid).

15. ## math

my i have help i am making bad grades What if an equation had three variables?

16. ## Science

Can you help with this one please? A drop of oil (vol 0.05cm^3) is released on to a calm surface of a pond where it spreads out and covers an area of 40 cm^2. Assume the oil film has uniform thickness equal to the diameter of an oil molecule. Calculate the

17. ## algebra

x/9 +3 = 8 - x/3 Solve?????? First, get rid of the fractions to make the equation easier to solve for x. Let's multiply every term by 9: 9 [x/9 + 3 = 8 - x/3] x + 27 = 72 - 3x 4x = 45 x = 45/4 Substitute 45/4 for x in the original equation to check. It

18. ## chemistry

Can anyone please help? ive been asked to write a balanced chemical equation for the breakdown of seleniuos acid H2SeO3 in water and to decuce the charge on the other ion that is formed. Thanks :) H2SeO3 (aq) ==> 2H+(aq) + SeO3=(aq)

19. ## Chem

The atomic numbers and masses must added up on both sides of the equation just as we must have the same number of atoms on each side of an equation when it is balanced. Ejection of a "thing" with 2 protons and 2 nuetrons is a He nucleus which is an alpha

20. ## Chemistry

You do it by finding Uuh in the periodic table and knowing that it will have chemical properties that are similar to those in the group with it. Here is a periodic table on the web. Find element #116 and observe the other elements in the same group (O, S,

21. ## Science

my i have help? Can you help with this one please? A drop of oil (vol 0.05cm^3) is released on to a calm surface of a pond where it spreads out and covers an area of 40 cm^2. Assume the oil film has uniform thickness equal to the diameter of an oil

22. ## Chemistry

Al2Se3 (s) + H2O (sub>(l) ==> Al(OH)3 (s) + H2Se(g) You can see that this reaction produces hydrogen selenide gas. But it will be wet because of the water. I can't draw diagrams on the computer so you will need to research your text and notes to see how to

23. ## chemistry

This question is about the polymer made by polymerizing this compound: CH2=CH-CH-OH | CH Please identify the monomer unit - there should be 3... also, what type of polymerization is involved in forming this polymer? sorry - the compound is.... CH2=CH-CH-OH

24. ## algebra! respond asap please!

The fastest measured speed of a ball in the game Jai-Alai is 302 kilimeters/hour. In men's tennis, the fastest recorded serve was 67.9 meters/second. Which is faster? 302 km l 1000 m l 1h l 1 min ------l---------l-------l--------- 1h l 1 km l 60min l 60

25. ## algebra

x+1 -x+2 = x+3 ____ _____ ____ 2 3 4 How do I solve this equations? These are fractions mi don't know I'm going to assume your problem is this: (x+1)/2 - (x+2)/3 = (x+3)/4 ...and you are trying to solve for x. If so, here's how you would go about it:

26. ## Communication

~~Use bulleted lists rather than burying data in paragraphs; it's harder to read and comprehend when buried so. ~~Use graphs and charts well. Here's a blog post which shows how data can be used and/or misused:

27. ## home economics

what are the different names of equipment used for cooking? Please post the names of the equipment that you know. Then, we'll be glad to help you find more names, if necessary.

28. ## chemistry

Everything is neutral. Touch a table, a chair, a desk, a tree, and you don't get a shock. Compounds are neutral. So Al2O3 must be neutral. Al has a valence of +3. Oxygen has a valence of -2. Now, let's add the charges. 2 Al @ +3 each is +6. 3 O @ -2 each

29. ## English

Coordinating conjunctions are these: FANBOYS (for, and, nor, but, or, yet, so). Whenever you use one of these conjunctions to join independent clauses (that is, they could be independent sentences on their own), you need a comma after the first clause and

30. ## Physics

Location A is 3.00 m to the right of a point charge q. Location B lies on the same line and is 4.70 m to the right of the charge. The potential difference between the two locations is VB - VA = 45.0 V. What is the magnitude and sign of the charge?

31. ## chemistry

If a chemistry student collected 825 mL of gas at 25 degrees C and 7.90*10^2torr, how many moles did she collect? PV=nRT Put P in atmospheres. torr/760 = atm. V is volume (in LITERS.) solve for n, the number of mols. R is a constant of 0.08206 L*atm/mol*K

32. ## English Lit

I'm supposed to decide which is more relevant, message wise, to today - the myth of King Arthur or Sundiata. Any ideas? First I would decide what the purpose of those two famous "stories" is. What difference did those men make? Then, think of the problems

33. ## Poetry/Iambic pentameter

I'm supposed to write a poem in iambic pentameter and then scan it (with stressed and unstressed marks). However, I can't seem to figure out where to put the marks over the words / figure out how to do it with syllables. Any help would be appreciated,

34. ## history

When were children required to go to school in Wisconsin? 1879. more info can be found @ infoplease. can you tell me what you typed in the search engine? I Googled compulsory education Wisconsin and found this site -- which confirms the date as 1879.

35. ## chemistry

Dr bob, Thanks, i understand that, at last! But wot if im asked to calculate when it is given as words? would it still be the same? Ie. instead of Al2O3, im giving it in words ie aliminium oxide. Basically im asked to calculate the mass of oxygen and the

36. ## Chemistry

what is the mass of two moles of NaCl? You look up the exact numbers on the periodic table or some other chart. I will use approximations. 1 mol NaCl = 1 Na + 1 Cl = 23 + 35.5 = 58.5 grams. 1 mols NaCl, then, is 2 x 58.5 = ?? g.

Discussing a book that involves a conflict between two characters leads children to: 1. examine their values 2. fear confrontation 3. act out unacceptably 4. adopt the behavior of one of the characters. Would #1 or #4 be the most best answer? Please help

38. ## Maths

Given that arg((z-1)/(z-2i)) = pi/4 describe the locus of P and sketch this on an argand diagram. Show that the point (1,3) lies on this locus. I know it is an arc subtended from the points (0,2) and (1,0) but I do not know how to find the centre of the

39. ## algebra

What is the slope of a line through (-5,2) and (6,7) in the standard(x,y) coordinate plane? Sorry, I forgot the choices F.9 G.5 H.-5 J. 5/11 K. -5/11 The main reason i can't figure this out is because I can't remember the slope formula. I need the slope

40. ## Calculus

A rocket is propelled from the top of a building 30 meters tall so that its height in meters (t) seconds after it is launched is presented by the function: h(t)= -9.8t2 + 45t + 30. 1)

41. ## ACT's

What is considered a good score to achieve on the ACT's? At what score on the 1-36 point scale is so low that you should consider retaking the ACT? I am just curious because I am taking it soon and stressing a little! Here is my advice: Because only the

42. ## Chemistry (Check)

Part B True-False Classify each of the statements as always true, sometimes true, or never true. 1.____ST______ one mole of any gas occupies a volume of 22.4 L. 2_____NT______ for a substance of known molar mass, the number of moles of a sample can be

43. ## Organic Chem.

When a tlc plate was developed the solvent front ran off the top of the plate, why? A two component mixture containing a dicarboxylic acid and tricarboxylic acid gave only one spot with an Rf value of 0.05. Solvent used; hexane. What went wrong? Solvent

44. ## math

can someone explain what "Big O" notation is. I looked on wikipedia and still do not understand it.

45. ## Physics

A railroad flatcar of weight W can roll without friction along astraight horizontal track. Initially, a man of weight w is standing on the car, which is moving to the right with speed v_0. What is the change in velocity of the car if the man runs to the

46. ## chemistry

Hi, how many moles does 0.225g of oxygen atoms represent? If 1 mole of oxygen atoms represents 16.0g? Thanks mols = grams/molar mass. thot so. Thanks for confirming ;) This is right for oxygen atoms, however, oxygen in the atmosphere is O2, and we normally

47. ## unscrambling a word

unscramble hautis hiatus

48. ## Please look! Econ. question

Suppose the preferences of the individual change in such a way that the individual requires now to be compensated to forgo one hour of leisure and be as satisfied as before.. im not sure what this means!! does it mean, the worker wants to give up one hr of

49. ## Science

How much sodium hydroxide, at what concentration, do I need to add to 500 mL of 0.1 N HCL to obtain pH 6.8. How do you calculate this? pH = -log(H^+) M HCl = N HCl mols = M x L. After you know mols HCl you have, then make a solution of NaOH and calculate

50. ## Economics

When the Bank of England cut interest rates does that mean inflation is reduced?? No. When the Central Bank cuts interest rates, it is interested in "spurring" the economy by lowering the cost of capital and thus causing more private investment. While

51. ## Science

mols of HCl= 0.1N X 0.5L=0.05 mols of HCl Therefore, number of mols of 2N NaOH needed to obtain pH 6.8: 0.05 mols HCL/2 = 25 mL Is this right? answered below.

52. ## Math

6*1/2 3 pretty much 6 X .5 which is the half of 6 which is 3!

53. ## chemistry

are these endothermic or exothermic? 2H2O2 (l) ¨ 2H2O(l) + O2(g) ∆H = -190 kj C(s) + H2O (g) ¨ CO (g) + H2 (g) ∆H = +113 A negative delta H means the heat is given up by the reaction. A + delta H means the heat is added to the reaction. thanks

54. ## Chem

What is the density of N2O, a gas, at STP? How many moles are in 16 grams of O2? density = mass/volume 1 mol of a gas occupies 22.4 L at STP. density = molar mass/molar volume = ?? #2. 1 mol O2 has a mass of 32 grams? grams = mols/molar mass = ??

55. ## chemistry

I cannot figure out how to work this stoichiometry problem with the given equation: Mg+2HCl-->MgCl2+H2 What volume of hydrogen is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl What do you not understand about it? It is a

56. ## "EASY" Algebra

Im not sure how to do this. (5q^3)(-12q^-4n^4) So far what i did was multiply 5 by -12 to get -60. Then q^3 by q^-4 to get q^-1. I don't know what to do after this. Maybe you could tell me what I should do and then I can solve it. I was taught exponent

57. ## Pre-Algebra

problem: Dena borrowed \$7500 to buy a used car. The credit union charged 9%(percent it looks kind of funny) simple intrest per year. She paid \$2025 in interest. For what period of time did she borrow the money. It would be 3 years. Get how much they charge

58. ## Biology

What the are similarities between aerobic respiration and fermentation? mi don't know to hard go to googles wish i could help but...you know I got no idea... Maybe if you don't know the answer you shouldn't post any replies.

59. ## chemistry

I submitted this question earlier... can anyone help me pls. This question is about the polymer made by polymerizing this compound: _ CH2=CH-CH-OH _ | _ CH3 Please identify the monomer unit - there should be 3... also, what type of polymerization is

60. ## social studies

in your opinion......should bush bring back our troops. I don't think your teacher wants the opinion of an anonymous Internet teacher. S/he wants YOUR opinion. Consider -- If we bring home the troops soon, Iraq will probably have more deaths the other

61. ## Math(Please Check My Work.)

3a^3b^2(-a^3b-a^2b^2)=-3a^9b^3-3a^6b^4 *is this correct.?- Remember to add exponents when multiplying with the same base. (3a^3b^2)(-a^3b - a^2b^2) = -3a^6b^3 - 3a^5b^4 I hope this will help.

62. ## Math(Please check my work.)

(2x-3)(x^2+5x-3)=2x+10x^2-15x+9 *Is this correct.? this is a different problem... Here's how this one works out: ......x^2 + 5x - 3 ............2x - 3 ================== ...... -3x^2 - 15x + 9 2x^3 + 10x^2 - 6x ====================== 2x^3 + 7x^2 - 21x + 9

63. ## Another problem to check..please check my work...

(-2x^2y)^3*(5xy^3)^2=(-2x^2y)^3 = -8 x^6 y^3 *Is this correct.? (-2x^2y)^3 * (5xy^3)^2 = (-8x^6y^3) * (25x^2y^6) = -200x^8y^9 When you have the same base, you add exponents when multiplying. For example, x^2 * x^3 = x^5. When you have the same base, you

64. ## How do I do this.?(Math.)

Use the Substitution method to solve the system of equations. y - 2x = -5 3y - x = 5 Solve one of the equations for x or y. Let's solve the first one for y: y - 2x = -5 y = 2x - 5 Now let's substitute 2x - 5 for y in the second equation to solve for x:

65. ## Chemistry

Please can you assist me with the following problem I am totally muddled - I could swear I've never even heard of science!!! H2SO4(aq) ---> 2H+(aq)+(SO4^2-)(aq) A 0.21 g sample of sulfuric acid is dissolved completely in sufficient water to make 0.25 litre

66. ## Chemistry

Can somebody pls help me with this? For the equation below find the net balanced equation: Ag + NO3- --> Ag+ + NO (Note: This reaction takes place in an acidic solution.) This is what I got: 3Ag + NO3- + 4H+ --> 3Ag+ + NO + 2H2O right

67. ## SCIENCE!!! help plz.... :-]

What is litum paper made of? If you cant find anything can you try to find some websites for me? THANKS A LOT!! 8-] litmus paper traditionally is a good grade (cotton) paper, with an extract of vegetable dye from the Litmus plant.

68. ## Geography

1.Name the Canadian ports that are opened all year round. 2.Which Canadian city is the eastern most provincial capital? Plz help. THANKS. http://www.acpa-ports.net/industry/cpafacts.html http://www.travelsense.org/destinations/canadacruise.asp Read

69. ## science

Please help me with this question.... The isotope caesium-137, which has a half-life of 30 years, is a product of nuclear power plants. How long will it take for the amount of this isotope in a sample of caesium to decay to one-sixteenth of its original

70. ## Math

find the value of n. fractions. 34+n=1 It says find the value of n. this is a fraction question.What does n =? 3 - + n =1 4 3/4 + n = 1 n = 1/4 To prove, substitute 1/4 for n in the original equation: 3/4 + 1/4 = 4/4 = 1 I hope this helps and is what you

71. ## Math

It says find the value of n. This is a fraction. 3 - +n=1 4 what does n equal??? See previous post.

72. ## science

I NEED help with finding adaptions of field mice. Does anyone know where they live (besides fields) and adaptions they've made? Field mice often come into homes and adapt to a warmer environment and readily available food.

73. ## Science

What type of energy always stays the same? There are chemical, electric, magnetic, gravitational, nuclear, and thermal (kinetic). All can be changed for the other. I can not think of an exception. Your teacher must have something specific in mind, I have

74. ## Math

find the value of n. What is the value of n? 3 - + n = 1 4 This has already been answered. See your previous posts.

75. ## More Organic Chem.

1. Would you expect ibuprofen to be soluble or insoluble in 1.0 M NaOH? Explain. 2. Thymol is very slightly soluble in water and very soluble in 1.0 M NaOH. Explain. Any info. would help! Below are two web pages. The first shows ibuprofen has a -COOH group

76. ## Science

Wil kinetic energy increase or decrease based on the amount of potential energy it starts with?? If potential energy is lost, KEnergy increases. Potential Energy + kinetic energy= constant.

77. ## chemistry

I don't think there is any benzene in Elmer's glue. In fact, I suspect finding something with benzene in it will be tough to do unless you have some OLD OLD bottles of something. Its a carcinogenic thing. If you are looking for something aromatic (meaning

78. ## sorry again

I n]have to find four crystalline substances and i found diamonds, salt and sugar can you guys give me two more. the reason why two is because I don't have diamonds to take to the classroom. Look at your earrings...fake diamonds, are crystalline, unless

79. ## economics

Identify three goods each for which your demand is (a) elastic or (b) inelastic. What accounts for the differences in elasticity? Thank you for using the Jiskha Homework Help Forum. Let me help by explaining the difference between elastic and inelastic

80. ## correct these sentence

The students trying their best to look cute and not succeeding. The students are trying their best to look cute, but they are not succeeding. Lisette is right in her correction. What you posted originally is not a sentence -- it's a fragment of a sentence

81. ## Math(Check Please)

1. Which line is the flattest (or is less steep)? Why? a.

82. ## math

for math im doing a survey of peoples heights and weights of like famous people and models..i was wondering how much does mary carey weigh and how tall is she? thanks

83. ## Please Check My Math Work2

3. You are sliding a big cabinet down a truck ramp for a customer. You must maintain control of the cabinet because it is very heavy. There are 2 ramps in the building. The equation of ramp 1 is y = 2x + 7 and the equation of ramp 2 is y = 3 x + 7. Which

84. ## Check This Also(Math)

5. Find the x and y intercepts of each linear equation. Be sure to write your answers as ordered pairs. a.

85. ## Biology, Cell Division

With each cell division , the chromosomes are divided between 2 daughter cells, yet the number of chromosomes in each cell does not change. What process ensures that the normal number of chromosomes is restored after each cell division? During which part

86. ## Literaure Question-Desperate For Help!

It is not wise to rely on the ________ to determine whether a stereotype exists in a book. title, illustrations, book's format, or copy-right date I do not know how to answer this question. My text says do not rely on the date of publication to tell you if

87. ## Literaure Question-Desperate For Help!

It is not wise to rely on the ________ to determine whether a stereotype exists in a book. title, illustrations, book's format, or copy-right date I do not know how to answer this question. My text says do not rely on the date of publication to tell you if

88. ## Communication

What strategies might you use to communicate the use of data effectively in written business reports Already answered: http://www.jiskha.com/display.cgi?id=1170695149 =)

89. ## DrBob222

are snow foam ball the same as moth balls? no. Styrofoam? Styrene is a aromatic, made from benzene. http://en.wikipedia.org/wiki/Polystyrene

90. ## DrBob222

Moth crystals. Those round moth balls are not foam, they are napthalene, a form of benzene. were could i find moth balls because the only one's i have at home are foam balls, or is there something else with an aromatic compound in it?

91. ## Chem

22.4/2 liters. what is the volume 16 grams of O2 at STP?

92. ## math,correction

can someone correct this for me please. Directions: Solve the following system by substitution. 5x-2y=-5 y-5x-3 what i received as the solution are : x = - (1)/(5) and y = 2 which it would look like: (-(1)/(5) , 2) correct.

93. ## math,correction

can someone correct this for me. Directions: Solve the following systems by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent. 10x + 2y = 7 y = -5x + 3 the answer: The variable

94. ## MATH,CORRECTION

Directions solve each of the following problems. Besure to show the equation used for the solution. In a town election, the winning candidate had 220 more votes than the loser. If 810 votes were cast in all, how many votes did each candidate received?

95. ## math ,correction

Directions: Solve each of the following problems. Be sure to show the equation used for the solution. The length of a rectangle is 2in. more than twice its width. If the perimeter of the rectangle is 34 in., find the dimensions of the rectangle. Let L =

96. ## Geog

1-on Dec 21, what is the noon sun angle for someone at 12 degree 15' S.Lat? ( give the answer to the nearest minut.) 2- In what horizon is the noon sun for this person?

97. ## Chemistry

To determine the volume in liters of 2.00 mol of S2 gas at STP, you would use _______ as a conversion factor. 22.4 L/mol

98. ## Marketing

What is the biggest issue or concern that should be looked at in marketing (product, competition, markets, customers, etc) and why?

99. ## question on microscope

"In order, list the lenses in the light path between a specimen viewed with the compound light microscope and its image on the retina of the eye." My son got this question and I cannot make sense of it. Growing up, we didn't have microscopes to use in

100. ## Spanish

How do you write or say School Supplies in Spanish? School Supplies in Spanish is.... Provisiones Escolares Thank you for using the Jiskha Homework Help Forum. Usually you don't need to capitalize either "School Supplies" or "Provisiones Escolares."

101. ## science

what chemical characteric of a substance that allows it to oxidize rapidly Usually the material has one or two electrons in the outer shell and the ionization potential is low.

102. ## biology

With each cell division , the chromosomes are divided between 2 daughter cells, yet the number of chromosomes in each cell does not change. What process ensures that the normal number of chromosomes is restored after each cell division? During which part

103. ## Lab conclusion- HELP!

I' am currently trying to wrie a couple of lab conclusions and having a hard time coming up with good points to make for the following lab experiment: Thin layer chorotography If anyone has a few minutes to give me a couple tips on how to improve this. I

104. ## Egypt

What was the importance of Anubis to Ancient Egyptians? The jackal-god of mummification, he assisted in the rites by which a dead man was admitted to the underworld. Anubis was worshipped as the inventor of embalming and who embalmed the dead Osiris and