# Questions Asked onFebruary 27, 2007

1. ## CHEMISTRY

HOW CAN U TELL IF HNO3 +KNO3 IS A BUFFER SOLUTION A buffer solution must contain a weak acid and its conjugate base OR a weak base and its conjugate acid. HNO3 is a strong base and KNO3 is the salt of a strong base (KOH) and a strong acid (HNO3);

2. ## Chem.

If 0.130 g of p-aminophenol is allowed to react with excess acetic anhydride , what is the theoretical yield of acetaminophen in moles? In grams? p-amino. - MW: 109.13g aceta. - MW: 151.16 g ** I just forgot how to do this, I know it's probably REALLY

3. ## Re: PHYSICS

"Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a compressed spring between them. When the blocks are released, the spring sends them sliding across a frictionless floor. (The spring

4. ## Physics

The drawing shows a plane diving towards the ground and then climbing back upward. During each of these motions, the lift force L acts perpendicular to the dispacement s, which has the same magnitude of 2.8 103 m in each case. The engines of the plane

5. ## Physics

A gymnist is swinging on a high bar. The distance between his waist and the bar is 1.1M. At the top of the swing his speed is momentarily zero. ignoring friction and treating the gymnist as if all his mass is located at his waist, find his speed at the

6. ## Physics

A worker pushes a 1500 N crate with a horizontal force of 345 N a distance of 24 m. Assume the coefficient of kinetic friction between the crate and the floor is .220. How much work is done by the floor on the crate? -M*g*(mu,k)*X Mg = 1500 N mu,k = 0.220

7. ## soial studies

Who helped create christianty,Judaism,& Islam. Where were they created,what are they,& when were they created. Thanks :) These sites will help you with this information. http://en.wikipedia.org/wiki/History_of_Christianity

8. ## Re: PHYSICS

"Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a compressed spring between them. When the blocks are released, the spring sends them sliding across a frictionless floor. (The spring

A wall is supported by a brace 10 feet long. If one end of the brace is placed 6 feet from the base of the wall, how many feet up the wall does the brace reach? Think of the right triangle frmed by the wall, the floor and the brace, and use the Pythagorean

10. ## chem question i need help

I need help on this question. Could someone give me tips on how to solve it? thanks An emergency breathing apparatus often placed in mines works via the following chemical reaction: 4KO2(s) + 2CO2(g) to make 2K2CO3(s) + O2(g) If the oxygen supply becomes

11. ## ashworth college

In completing the work sheet, what is the reason for adding the net income for the year to the balance sheet credit column total It helps to put a subject in the subject box. In completing the work sheet, what is the reason for adding the net income for

12. ## physics 2

A man is dragging a trunk up the loading ramp of mover's truck. The ramp has a slope angle of 20 degree, and the man pulls upward with a force F whose direction makes an angle of 30 degree with ramp. a. How large a force F is a necessary or the component

13. ## chemistry, science

Propose a method for determining the specific heat, for a metal like sodium which reacts with water What about using a liquid, not water, which doesn't react with Na. i am doin this presentation on acids and alkalis and i need help finding a site that will

14. ## CHEM

Why is iodine a different colour in different solutions? Iodine in water is a dirty brown ikky color due to the polar water molecules' attraction for the iodine atoms since they are polar, too, due to instantaneous dipole-induced dipole attractions. In

15. ## science

Propose a method to find the specific heat of sodium which reacts with water Two methods to think about. Use a liquid with which Na doesn't react. OR, use a weighed amount of Na metal to react with water. Measure T of the water before addition of Na and

16. ## cabinet

what is the main role of the cabinet the main role of the cabinet is to make the laws of the USA so that Plankton can rule the world...muhahahahahahahaha!!!!!!! a more sensible answer to this question is that the cabinet is part of the executive branch,

17. ## PHYSICS, still cant get it

A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 40.00 m/s relative to

18. ## CHEMISTRY

A BUFFER SOLUTION IS MADE FORM 0.10 MOLES NaF AND 0.25 MOLES OF HF IN 1 LITER OF WATER ----WHAT WILL THE BUFFER CAPACITY BE IF 1.0M HCL IS ADDED -----WHAT IF 2.0 M OF NAOH IS ADDED?? PLEASE HELP I HAVE NO CLUE WHERE TO EVEN BEGIN!!! Calculate the pH of the

19. ## chemistry

I have a chemical composition of As2O3. How do I calculate the mass of oxygen that combines with 1 mol of arsenic to form the oxide of arsenic? How do I use this to obtain the empirical formula of the oxide? That IS the empirical formula of the compound.

DrBob222 please check my physics question posted at 8:55pm. The subject is drwl please check. I am not getting a response from drwl. Thanks! Mary DrWLS is not on right now. My physics is too poor to trust my answers. Bob Pursley is smarter than I am; he

21. ## Physics

A cable lifts a 1370 kg elevator at a constant velocity for a distance of 42 m. What is the work done by the elevator's weight? The elevator weight is actually gravity. Gravity does - mass*g*height of work on the object.

22. ## science

Wind does not blow upwards. This arrangement would encourage the female cones to pollinate with other trees. Some conifers bear female cones on the top half of the tree and male cones on the bottom half. Why do you think this arrangement of male and female

23. ## math number story

julie arrived 20 minutes before the race began she started right on time. it took her 24 minutes to finish the 6 kilometer race. she stayed 10 minutes after the race to cool off;then she left. if she arrived at the race at9:10am,what time was it when she

24. ## Re: PHYSICS

A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 40.00 m/s relative to

25. ## Chemistry

Can anyone help I have to write an equation a structural formula for a reaction between the following, having some trouble working it out. Hopefully you can understand the way I have put it. CH2=CH-CH-OH there is a CH3 with single bond under CH next to OH

A shot-putter puts a shot (weight = 70.1 N) that leaves his hand at distance of 1.53 m above the ground. (a) Find the work done by the gravitation force when the shot has risen to a height of 2.18 m above the ground. Include the correct sign for work. (b)

27. ## math,help,factoring

i need help i don't know how to do the next step. factor by grouping x^3-3x^2+4x-12 so what i have so far is this =(x^3-3x^2)+(4x-12) =x(x^2-3x)+4(x-3) from here i don't know... and then this one is driving me insane this next one... Rewrite the middle

28. ## Earth Science

What is the relative humidity of sample 2: Sample: 2 T(degrees)C: 32(degrees) Mass of Water Vapor: 14 g Mass of Water vapor at Saturation: 34 g please help me...i don't understand how to find this The relative humidity in this case is 14/34 = 41% It is

29. ## science

when can the plant start to make its own food? A plant always makes its own food. Ever since it existed it made its own food through photosynthesis. The leaves take in the sunlight and form it into food. It also releases oxygen.

30. ## Graphing and Exponential Function

I really don't understand on graphing exponential function. Can anyone help? It is difficult to answer this. Make a table of values, say. y x for the function y=e^x fill in the table, plot the points.

31. ## bobpursley

I had ask this question of you before but I didn't understand your response. Can you please clearify further. The question is: a skateboarder moving at v = 5 m/s along a horizontal section of a track that is slanted upward by 48° above the horizontal at

32. ## Science

Some conifers bear female cones on the top half of the tree and male cones on the bottom half. Why do you think this arrangement of male and female cones on trees is important?

33. ## Math riddle

nine odd numbers have a sum of 243.find the sum of the first and last numbers in a set of numbers. hint:if three numbers when added equals twelve then represent it by adding n+()n+1. no one cares...durrr....

34. ## chemistry

This is like the other one I posted about. I have to predict the product. Zinc (s) + sulfuric acid (aq) ----> ____ Please and thank you! This is a single replacement type reaction. Products are ZnSO4 and H2. Same type as Al and HCl. how do you know that H2

35. ## CHEMISTRY

Been trying for days to crack this sure it staring me in the face understand princple just can't work out the one I have been given to do. I have to polymerize CH2=CH-CH-OH with a CH3 under CH next to the OH I need to identify the monomer unit and what

36. ## Accounting

I need help with a problem involving adjusting entries. It is involving rent expense and prepaid rent. Here is the information I am given on the Unadjusted Trial Balance, Dec. 31, 2005: Prepaid studio rent: 2,500 Studio rent expense: 11,250 The data says,

37. ## math

what is a number model? Since this is not my area of expertise, I searched Google under the key words "number model" to get these possible sources: http://www.minet.uni-jena.de/~novak/model.html

38. ## CHEM

What forces hold iodine particles together??? Intermolecular forces called induced dipole-induced dipole attractions. I have also seen it called instantaneous dipole-induced dipole and fluctuating dipole, induced dipole. The term instantaneous

39. ## science

what volume of helium would be in a balloon the size of a soft drink bottle? Depends on the size of the soft drink bottle. . . . The worksheet didn't specify the size. It wants us to apply strategies. Thank you.... i'm assuming about the same volume as in

40. ## Math riddle

nine odd numbers have a sum of 243.find the sum of the first and last numbers in a set of numbers. hint:if three numbers when added equals twelve then represent it by adding n+()n+1.

41. ## Chem

Look on your calculator. You know the definition of pH. It is pH=-log(H^+). Well, we have the same thing in pKa, pKb, pOH, pKw, etc etc. pKsp = -log Ksp. Punch 57.685 into the calculator. Now change the sign to make it negative. Now look for a button that

42. ## Math

-4 is less than 12+x (Idon'y know how to make the less than sign on the computer) I've subtracted 12 form each side and I get -8. What am I doing wrong? 2m-5=17 I added 5 to each side and get 22. Then divide by 2 get 11. Is that coeerct? -4 < 12 + x -16 <

43. ## Calculus

at what point is the tangent to f(x)=x^2+4x-1 horizontal? That would be when the derivative, df/dx = 2x + 4, equals zero. df/dx at any point of a curve f(x) is the slope of the tangent line.

44. ## geography

in this assignment, I am given the latitude and longitude coordinates and these coordinates either pinpoint t city, a nation, an ocean, a sea or mountains...however the assignment did not come with a map to locate the coordinates. where can i go for the

45. ## Stats

In a study that was highly published doctors discovered that aspirin helps prevent heart attacks. The research project which was scheduled to last 5 years employed 22,000 american physicians (all male). Half took an aspirin tablet 3 times a week while the

46. ## physics

When you hold your hand palm-up, the atmosphere exerts a force of about 800 N on the palm of your hand. Comparing this force with I. the force on the back of the hand, II. the force on the palm when you are holding your hand vertical, III. the force on the

47. ## Biology

Are IV fluids hypertonic, hypotonic, isotonic? The tonicity depends on what fluids are being used in the IV. Since this is not my area of expertise, I searched Google under the key words "IV fluids hypertonic hypotonic isotonic" to get these possible

Hi, I asked this question yesterday and I was given help in how to solve it. After working the problem, I have came up with \$575.27. The problem is: When Beth finishes college, she has a balance or \$2876.37 on a credit card with an annual percentage rate

49. ## Statistics

2 samples were collected to determine whether there was a difference between two weight loss methods targeting men. The average weight loss method is provided for the 2 samples along with the respective standard deviations. Is the second method - with an

50. ## chemistry

What evidence supports classifying H2SeO3 as an acid? In a water solution, it turns blue litmus red.

51. ## math

Fifteen percent of the seniors voted for Joe. If 289 seniors voted for tehother candidates, how many seniors voted in the election? Let the total number voting be N. 0.85 N = 289 Solve for N

52. ## math,correction ,

can someone correct these for me please... Remove the parentheses. -(3x+5y) My answer: -3x-5y Find the value of the polynomial -x^2+3x-1 when x=4 My answer: -5 multiply. 10x(-4x-7) my answer: -40x^2-70x all correct. awsome.....thank you...i just want to

53. ## Chemistry

I saw that article on Google - that is actually how I got the idea to sublimate the naphthalene. But thank you for the suggestion! It makes me feel much more confident to know that I am on the right track! Thank you! We have a lab where we have to separate

54. ## worl History

I'm doing this one project for world history on the BATTLE OF BOUGAINVILLE, and I'm having trouble finding the right information, i can't find the leading military officers from both sides, the axis leader and the alied leader. can somebody help me?

55. ## Chemistry

Can anyone tell me why a hydrogen atom has so many spectral lines even though it has only one electron? Also how would I explain this using a diagram? There are many unfilled energy levels above ground. Excited electrons can move betwixt those levels on

56. ## math word problem

the difference between two numbers is 55. four times the smaller number plus 5 times the larger number is 176. what are the numbers? L-S=55 4S+5L=176 solve by substution.

what role do managers play in helping their organization become successful? How might this impact you as a employer? Managers play a big role in helping their organization become successful. The manager makes sure that everything is going well and that

58. ## Dr Bob222

Can you help me with this please - Temp - 650 Pressure - 690mm Hg mass - 0.927g volume - 194cm3 How do I calculate the volume of the gas at a different temp? & at a different pressure? You can do this two ways. The simplest is P1V2/T1 = P2V2/T2

59. ## Sounds

Seriously, I would love to know the answer to this question, will someone please answer it!!! What is quick back-and-forth motions repeated over and over? That wasn't a answer, I NEED AN ANSWER!!! wave? Pressure wave? Sound wave? Transverse wave? I think

60. ## Re: PHYSICS

A stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction, where they stop. Piece L, with a mass of 2.0 kg, encounters a coefficient of kinetic friction µL = 0.40 and slides to a stop in

61. ## voc electronics

what happens when iron is heated It gets hot. Ha, Ha. But I'm sure you didn't want that for an answer. Please be more specific about what you are looking for and I can refine that answer for you.

62. ## science

the question says assume the valencies of hydrogen, nitrogen and carbon in the compounds are 1, 3 and 4 from this i must draw a structural formulae for hydrogen cyanide and cyanogen that are consistant with these valencies. please help H : C::: N: Does

63. ## A.P. American Governmen

Know how congress meets and how it is adjourned These sites will give you varying instances under which Congres will meet or adjourn. http://www.law.cornell.edu/constitution/constitution.articlei.html http://en.wikipedia.org/wiki/United_States_Congress

64. ## Spanish

I wrote a story for my Spanish class; could someone please proof-read part of it for me? Thanks! Ella se cae, arrodillada sobre la orilla. Es donde ellos tuvieron sus primero encuentra. Llorando, ella se depila los pétalos de una flor. Ella gota los

65. ## Geography/auto Industries

What government imposed barries stop or hinder the export of automobiles? In almost all cases, trade barriers are imposed to restrict IMPORTS. Is that what you meant? India was a prime example, but that situation is changing. There were others.

Problem: 6-3x 25 ---- * ---- 5 4x-8 *I have to multiply the expression and simplify it.Thanks for your help. The five goes into the twenty five, and you can factor out a three from the first term in the numerator, and a two from the second term in the

67. ## Math--I need help!

I have these two questions on my assignment. Please help me. 80 mi. = _______ km. 9 cm. = _______ m. 9cm (1m/100cm)=??? 80miles (1 km/1600m) one mile = 1.6093 km so 80 times 1.6093 = what? one cm = 1/100 m or .01 m so 9 cm = 9 times .01 = what? 9 cm = 0.09

What is the relative humidity of sample 2: Sample: 2 T(degrees)C: 32(degrees) Mass of Water Vapor: 14 g Mass of Water vapor at Saturation: 34 g please help me...i don't understand how to find this

69. ## Math Question

Hi! We asked this question last night but we got confused. Find the amount in the account if \$2000 is invested at 6.125%,compounded semi-anually, for 2 years. I worked this problem and Lydia worked this problem. I came up with the answer \$2,252.50 However,

70. ## Biology

Are any of these anabolic reactions? a. making starch from many glucose molecules b. making proteins from many amino acids c. making many glucose molecules from many glycogen molecules Since this is not my area of expertise, I searched Google under the key

71. ## Math

decimal notation for 19% is 0.19 right? fraction notation for 38%is 19/50 right? percent notation for 0.382 is 38.2% right? all are correct, i believe correct

72. ## Quantum Physics

Has anyone done Block 7-8 for TMA 6 for s103 - discovering Science, as i am struggling big time, any help would be much appreciated yes i am like you really phased by this how much of the tma have you managed to do Me, too what r u stuck on? I have been

73. ## Life Science

Some conifers bear female cones on the top half of the tree and male cones on the bottom half. Why do you think this arrangement of male and female cones on trees is important?

74. ## Math

what is the square root of 16???????? 4

75. ## how would..

How would the membranes maximum potential change if the stimulus was double the threshold frequency? It would help if you put a real subject in the subject line so the right teachers would know to respond to your question. It would also help more if you

76. ## Chemistry

Look up the boiling points and relative molecular masses of water, hexane, and ethanol. Try to explain the relative magnitudes of their boiling points in terms of polarity. I know that ethanol and water are polar and that hexane is non-polar. Also, 6)

77. ## math

what is 1/3 of 1/4 = ? Multiply the two fractions to answer your question. 1/3 * 1/4 = 1/12 I hope this helps. Thanks for asking.

78. ## chemistry

Temp - 650 Pressure - 690mm Hg mass - 0.927g volume - 194cm3 How do I calculate the volume of the gas? You have the volume, given. How do I calculate the volume at a different temperature?

79. ## chemistry

Can someone please help me with this problem? Predict the products. Aluminum(s) + hydrochloric acid (aq) ---> ________ aluminum chloride + hydrogen Correct. AlCl3 and H2 thanks

80. ## algebra

please help with the following problem using the substitution method y=2x x+y=12 thanks x + 2x = 12 3x = 12 x = 4 y = 2x = 8

81. ## math correctionplz

can someone correct these also for me.. Which of the following is not a polynomial? a) 24 b) 4x^3+5x-1 c)2x-(1)/(x) d)3xy^2+xy MY answer is: A Simplify. write your answer with only positive exponents (y^5)/(y^10) Possible answers: a)y^2 b)(1)/(y^2)

a skateboarder moving at v = 5 m/s along a horizontal section of a track that is slanted upward by 48° above the horizontal at its end, which is h = 0.52 m above the ground. When she leaves the track, she follows the characteristic path of projectile

83. ## math , help

I hope this is correct now.... Write using positive exponents, and simplify if possible (-3x)^-2 a)(1)/(6x^2) b)(9)/(x^2) c)(1)/(9x^2) d) - (9)/(x^2) My answer: c Evaluate 4^-5 My answer is: (1)/(1024) Both look OK!

84. ## biology

are the people with diabetes I normally skinny? because their body is unable to produce insulin, they must turn to other sources of energy like stored fat? http://www.associatedcontent.com/article/11204/juvenile_diabetes_type_one_diabetes.html Read the

85. ## French

Which of the following is correct? J'ai continué mon voyage J'ai continué avec mon voyage Help would be appreciated :) Thank you for using the Jiskha Homework Help Forum. To answer your question, do you prefer: 1. I continued my trip. 2. I continued with

86. ## education

For a description of environment in a child care setting are we supposed to look for if its clean or if its safe. Thanks Both. I wouldn't enroll a child in a place that was clean but not safe, nor safe but not clean. =)

87. ## Social Studies/English

Hi! I'm writing a research paper for my AP English class. My topic is abolishing the British Monarchy. I am trying to prove that the monarchy should be maintained. Does anyone know any good sources of information to help me or any ideas to help me prove my

88. ## respiration/releasing energy

Does respiration release more energy from 1 gram of fat than from 2 grams of glucose?

89. ## math,correction

add 5y-4 and 2y^2-8y my answer is: 2y^2-3y-4 classify the following, if possible 7x^2+10xy+y^2 a)not classified b)trinomial c)monomial d)binomial My answer: trinomial Write using positive exponents, and simplify if possible (-3x)^-2 a)(1)/(6x^2)

90. ## math

wat is the solution to the following equaton? 4(4n + 7) = -20 4(4n + 7)= -20 16n + 28= -20 16n= -20 - 28 16n= -48 n= -48/16 n= -3

3 cubed square root of negative 432 What gets cubed? The 3 or "the square root of negative 432" ? If you mean 3^3 * sqrt (-432), the answer is 561.18 i, where i = sqrt (-1).

92. ## math

simplify the expression 4(7-2q) +9q Jose if I am not mistake the solution to your question is 4(7-2q) +9q 28 - 8q +9q 28 + q Jose, Mary is correct.

93. ## Intro and conclusion

Hi! I wrote in here a few days ago about my thesis. I was wondering if I could get some feedback on my intro and conclusion. I think Im just about done with my essay, with the exception of these two portions. Thanks! Intro: The riddles in A Feast of

What is 12% of 250? Is it 30? Is decimal notation for 19% 0.19? Thank you! Yes, 12 percent of 250 is 30. Yes on the second. Yes to both.You're Welcom!!! =)

95. ## social studies

Mauna Loa:Hawaii::Fujiama:? http://www.google.com/search?q=fujiama&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA Which do you think is correct? =)

96. ## Math

\$500 at 6% interest after 90 days would be \$507.50 in an account. Right? Yes

97. ## chemistry

If the arsenic is 76% and oxygen is 24% how would I calculate the chemical composition of of the oc=xide of arsenic that has been formed? Divide 76 by the atomic weight of As (which is 74.92) and 24 by the atomic weight of O (which is 16.00). The two new

98. ## Math!

In the equation A=p+prt, t is equilvalent to... (1)A-pr (3)A - p _________ ___ p pr (2)A-p (4)A - pr ________ ___ pr p t is time. Your answers are difficult to interpret. Solving for t, t = (A-p)/pr

99. ## Math

I have to make up a story problem that divides 4/5 by 2/5 .... I'm having a hard time creating a problem think of having group of friends and food. that one is very common. John used up 4/5 of his gas tank getting 2/5 of the way to his destination. How

100. ## Math

Is percent notation for 0.382 38.2? yes. yes.