Questions Asked on
February 28, 2007

  1. chem

    For the reaction 3NO2 + H2O  2HNO3 + NO, how many grams of HNO3 can form when 1.00 g of NO2 and 2.25 g of H2O are allowed to react? This is a limiting reagent problem. 1. Write the equation. You have done that and it is balanced. 2. Convert 1.00 g NO2 and

    asked by meghan
  2. DESPERATE NEED OF HELP--Chemistry, almost done

    Calculating Yield--need some help finishing problem. Almost done, just need help one ONE step, please help!!? Well we did a lab on limiting reagent/reactants. The balanced equation is Sr(NO3)2 + 2KIO3 --> Sr(IO3)2 + 2KNO3 Mols of Sr(NO3)2 used was .005023

    asked by Angie
  3. chemistry

    Can someone please help me with this problem? An iron nail placed in a beaker with a solution of silver nitrate will cause pure silver to collect on the bottom of the beaker. Write a balanced equation for the reaction that occurs. This is what I have so

    asked by Donna
  4. AUTORADIOGRAMS

    How could the identity of a compound on an autoradigram be determined? Radioactive isotopes are introduced into a plant, where they undergo transformation into compounds. Then, under electroproesis, the radioactive compounds are indicated.

    asked by Anonymous
  5. Physics

    A 50 kg diver steps off a diving board and drops straight down into the water. The water procides an upward average net force of 1500 N. If the diver comes to rest 5m below the water's surface, what is the total distance between the diving board and the

    asked by Christy
  6. Physics

    A 59.5 kg person, running horizontally with a velocity of +3.90 m/s, jumps onto a 12.2 kg sled that is initially at rest. (a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away. (b) The sled

    asked by Mary
  7. Math--- Question

    I have this on an assignment. Round to the nearest tenth 35/12= 2.916666667 Would it be 2.9 or 3.0 ? 2.9 see, if you rounded to the nearest whole number it would be 3 are you positive it would be 2.9 and not 3.0? Thanx! The question says to round to the

    asked by Tracie
  8. Chemistry

    What is a method for determining the specific heat for a metal like sodium which reacts with water? You could heat it and let it come to an equilibrium temperature inside a calorimeter. or you could put it in a liquid such as kerosene and observe the heat,

    asked by Brown
  9. physics

    Draw the figure, and calcuate the height above the bottom point the swing starts. (I remember it as 2.3(1-cos25)). the initial energy is mg*height. The final energy is 1/2 m v^2 The difference is frction. A 49 kg child on a 2.3 m long swing is released

    asked by bobpursley
  10. Algerba

    Find slope and y-intercept of following equation y=-3 x -2 knowing the slope of intercept 5 formula is y=mx+b slope is m or -3 y=-3 or m (0) -2 m=slope 5 5 y-intercept = let x=o solve for y y=0-2 y=-2 You can tell by inspecting the equation in the y = mx +

    asked by Trusthim2
  11. Chemistry

    Iodine Clock Reaction How does the concentration of iodide ion change during the initial portion of the reaction, while there is still unreacted thiosulfate present http://quiz2.chem.arizona.edu/preproom/Demo%20Files/the_iodine_clock_reaction.htm how does

    asked by Anonymous
  12. auto industry

    what government imposed barriers stop or hinder the export of automobiles? Are you sure you don't mean the import of automobiles? I asked this once before. I see no reaon why any country would want to ban exports, unless they involve things like weapons

    asked by karen
  13. social studies

    wat happen during the reconstruction plans after the civil war http://en.wikipedia.org/wiki/Reconstruction In additiion to this article, be sure to check out the external links, etc., at the bottom.

    asked by jose
  14. ancient mariner

    Do you think the ancient mariner is a romantic poem? I am having problems trying to figure out why it isnt'. thanks This site will give you the era and definition of poetry from the Romantic era. After reading it, you will be able to see where The Rime of

    asked by casey
  15. Physics, still don't get it!

    The drawing shows 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

    asked by Mary
  16. math--pre alg

    not sure i did right 3(f+2)+9=13+5f 3f+6+9 = 13+5f +9 3F+15 = 12+5F GOT MIXED UP SOMWERE HELP 3f +6 +9 = 13 + 5f 3f + 15 = 13 + 5f 2f = 2 f = 1 drwls is correct You are doing OK up to this point: 3f + 6 + 9 = 13 + 5f Now combine any like terms. (We can

    asked by david
  17. chemistry

    I think, by convention, most would consider the solvent as the major component and the others as solutes. Actually, however, it dosesn't matter. I just read that when one liquid is dissolved in another, the minor component is usually considered the solute

    asked by DrBob222
  18. Physics- drwls please help

    The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.021 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.041 kg and is initially at rest. The

    asked by Mary
  19. chemistry

    Temp - 650 Pressure - 760mm Hg mass - 0.927g volume - ? I need to work out the volume I know that Pv=nRT but I just can't figure this out. I've been told the answer is 176cm3 but I don't get that. Can someone please explain this to me. You don't have

    asked by sarah
  20. chem - Urgent, please help

    0.702g arsenic combines with 0.225g of oxygen to make an oxide of arsenic. When heated this produces a gas with a volume of 52cm3. How do i work out the molecular formula of the oxide when its in a gaseous state? The weight ratio will tell you, after

    asked by laura
  21. Math

    Hi, I don't remember how to solve this. Please help me remember. "I live 3 miles north and 1 mile west of the mall. Ellen lives 2 miles south and 5 miles east of the mall. What is the shortest distance between our houses?" Thanks in advance, Haley Think

    asked by Haley
  22. math,correction

    Can someone correct these for me plz... Problem#6 Factor. x(x-5)-2(x-5) My answer is: (x-2)(x-5) Problem#7 Factor completely. x^2-x-6 My answer is: (x+2)(x-3) Problem#8 Factor completely. 35x^2+40x+5 My answer is: (7x+1)(5x+5) Problem #9 Factor by

    asked by jas20
  23. bobpursly,

    Is this correct now after i revised it Multiply. 3xy^2(5xy-4x+6y) 3xy^2(5xy)=15x^2y^3 3xy^2(-4x)=-12x^2y^2 3xy^2(6y)=18xy^3 so i get from this 15x^2y^3-12x^2y^2+18xy^3 correct awsome i just thought that the 15x^2y^3-12x^2y^2 should be combine...

    asked by jas20
  24. math, Calculus

    Find the relative extrema of the functions. f(x)=4x/(x^2+1) f(x)=1/(x-2) take the derivative, set to zero. the first as an example: f(x)= 4x (x^2 +1)^-1 f'(x)= 4 (x^2 +1)^-1 -4x(2x)(x^2 +1)^-2 set to zero. Multiply through by (x^2+1)^2 0=4(x^2+1) - 8x^2

    asked by Reisha
  25. chemistry

    It's hydrogen carbonate, which is HCO3- Should the reactant be H2CO3? How do you balance this reaction?: HCO3 ---> H2O + CO2

    asked by Stanley
  26. chemistry

    How do I determine the molecular formula of a gas? It depends on what information you have. I have the empirical formula and chemical composition of the oxide. I also have the volume of the gas. I have the empirical formula and chemical composition of the

    asked by sarah
  27. math,correction

    Can someone correct these for me please.. Find the value of the polynomial 8x – 6 when x = 1 and when x = –1. My answer: So when x = 1 the value of the polynomial is: 2And when x = -1 the value of the polynomial is: -14 Multiply. (x – 8)2 Answer:

    asked by jas20
  28. AP US History

    I am writing an essay on the following topic: "Political historians often argue that the election of 1896 was a 'turning-point' election and a 'watershed year' in national politics. Why?" I am asking if the following outline will work for my essay: Intro:

    asked by Hannah
  29. math-inequalities

    I really don't understand this stuff for example: 9b-3b+34

    asked by Paige
  30. Chemistry - Isotopes

    The isotope caesium 137 has a half life of 30 years. How long will it take for the amount of this isotope in a sample of caesium to decay to one sixteenth of its original amount? Please can someone explain how I can calculate this from the quantities that

    asked by Bean
  31. chemistry

    Thanks much! Are melting point and boiling point examples of macroscopic properties? What exactly are macroscopic properties? Yes, mp and bp are macroscopic. One can see melting and boiling. macroscopic: large enough to be visible to the naked eye

    asked by Miranda
  32. Econ T/F

    If a consumer is in equilibrium and all prices and her income increase by 25%, she will consume less of those goods that she considers inferior. if false, explain why. Take a shot. What does your economic reasoning tell you? Hint. If all prices and income

    asked by Elle
  33. History

    Who was the first president to get impeached? http://www.mapsofworld.com/us-presidents/us-president-trivia.html Scroll down. You'll find it! =) who commanded the texas forces at the battle of the alamo?? .stephen austin .william travis .or brigham young

    asked by Anonymous
  34. US History

    Who was a more effective progressive - Woodrow Wilson or Theodore Roosevelt? That sounds like an opinion question to me. Look up some facts on google about what each of them did during their presidency.

    asked by Hannah
  35. drwls please help!

    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

    asked by Mary
  36. french

    i need help with my french wat does j'aime brien ma ville.Le weekend mon pere va au marche et vais au cinema mean i don't have a clue! please help Thank you for using the Jiskha Homework Help Forum. With the aide of a good paper-back dictionary (English to

    asked by hazel
  37. science

    what is the diference between turtle and tortoise. They look the same and why they are called differently. Hi I was unable to post some web addresses, but if you search under google "differences between turtles and tortoise" it will bring up some addresses

    asked by Basil
  38. Nature

    I am researching about why water is blue. I am wondering why is the water in the Caribbean bluer that that of the North Atlantic? Thank you for using the Jiskha Homework Help Forum. This is an interesting question and here are some sites to explain it:

    asked by Ross
  39. math,correction

    can somone correct these for me please... Simplify (m^5)^8 My answer.m^40 List the terms and coefficients of 8x^3-4x^2+3 My answer: terms: 3 coefficients: 8,-4 This next one i'm not sure about how to even do it... write 9.03 X 10^-2 in standard notation.

    asked by jas20
  40. Math

    The Parent group of the local head start promoted recycling in their neighborhood one saturday in march by distributing sets of blue and green recycling bins to grocery shoppers at central market place. Out of the 248 shoppers who stopped by head start's

    asked by Philip
  41. Geo.

    Why did Sir Sandford Fleming feel there was a need for time zones? Thanks. This site will give you the history and Fleming's contribution. http://wwp.greenwichmeantime.com/info/time-zones-history.htm

    asked by May
  42. read essay!!!!!!!!!!!!!!!!!!!!!!!!!!

    read my essay and tell me if its good Industrialization, which followed the Civil War, had a big impact in the United States. The workers suffered a great deal. They worked hard and lived in poor conditions. Children also suffered; children had no

    asked by ANAIS
  43. Math

    x/3=2 x=2*3 x=6 x/6=3 x=3*6 x=18 How would I get the missing number? ?/3 = 2 ?/6 = 3 What number divided by 3 will equal 2. Multiply 3 times two for the answer. Same for ?/6=3. what do u divide by to get 2 what u divide by to get 3

    asked by Mischa
  44. chemistry

    My work: pH = -log(x) = 4.49 x = 3.2359e-5 3.2359e-5 = 5.72/M When I solved for M, I got that large number... 176764.8987 Ka for a given weak acid is 5.72 x 100. What concentration of acid (mM/L) will give a pH of 4.49? I got 176764.8987 M (not converted

    asked by Meche
  45. Fashion

    Does anyone know where i can find pictures of old clothing brands from the 90's? Especially Eclipse Jeans, Spliffy Jeans, Naf Naf co 54, Paco sweaters, Kickers shoes and sweaters, Fido Dido shorts etc... anymore pics of any more brands would be amazing!

    asked by Krystal
  46. History

    History help? its on- imperialism in the late 1800s: The Case of Africa What is your question? You have not stated it yet. Plz do, so it can be clear to the rest of us on what you are trying to say. Thx :-)

    asked by Annonymous
  47. math, correction,plz

    Can someone correct these for me..plz... Problem #1 simplify. ((p^5)^4)/(p^6) MY answer: p^14 Problem #2 Write using positive exponents only. b^-6 MY answer: (1)/(b^6) Problem#3 Write 1.81 X 10^-2 in standard notation My answer. 0.0181 Problem #4 Subtract

    asked by jas20
  48. IT

    Why is the waterfall model valuable in the management of information technology projects? Refer to "Arguments for the Waterfall Model" in http://en.wikipedia.org/wiki/Waterfall_model The waterfall model is a sequential software development model (a process

    asked by Maria
  49. geography

    what are the advantages and disadvantages of the 'one child policy' in china? http://www.google.com/search?q=china+one-child+policy&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA Lots of information in here. =)

    asked by jessica
  50. Math

    A physician prescribes 3.5 mg. of medication each day. How many micrograms is this dosage? Thanx for the help! 1mg is 1000mcg. I am told that mcg is a "modern" abbreviation for microgram. So, I say 3.5 x 1000= 3500 mcg Right? thank you! correct What´s the

    asked by Bethany
  51. PSYCHOLOGY STATISTICS

    I have a question regarding my statistical analysis choice. I have 40 male and 40 female participants doing my experiment (involves looking at magazines, then filling in some questionnaire measures). - 20 female participants will look at the female

    asked by Daisy
  52. Math-Proportions

    My math question says- 1 1/2:9 = x:18 Now I gotta figure out the missing number [x]...I have 3 guesses on what answer the missing number [x] is! Either- A)2 1/2 B)3/4 or C)3 Which one is it? 1 1/2:9 = x:18 1 1/2/9 = x/18 x = 1 1/2*18/9 x = 3 hi i like

    asked by °•Oo.Darian.oO•°
  53. Math - please check

    1.Find the median of these numbers: 3, 8, 4, 16, 10, 12 Wouldn't the median be 9? 2. Find the mode of these numbers: 1, 2, 1, 5, 3 Wouldn't the mode be 1? The median would have equal numbers of entries above and below. 9 is correct The mode is the number

    asked by Shyanne
  54. Capital Markets

    anyone have knowledge of bonds, mutual funds, and stripping bonds. I have a few problems which i cant figure out but they're kinda long Yes, I have owned each of those. Go ahead and ask your questions here. One at a time would be best.

    asked by joe
  55. Chem

    A Texas Aggie buys 12 cans of dehydrated water. The cans weigh an average of 63.46g each before the dehydrated water is removed. If the density of pure distilled water is 0.9979 g/mL and each can has a volume of 3.154L, what is the total mass of the cans

    asked by Mercedes
  56. WWI

    "One of the ironies of World War I was that in a war 'to make the world safe for democracy,' the government attacked the civil liberties that make democracy possible." I don't know what you're supposed to do with that (quotation?), but the search results

    asked by kelly
  57. Math

    Can you help me? 360 in^ = _____ ft^ ( ^ means 2 ) So which would the answer be: 30, 3.6, 2.5, or 1.8 Wouldn't it be 30? (If I'm working this right)! Thank you!! Thank you A square foot = 12 inches by 12 inches = 144 square inches. What does dividing that

    asked by Bobby
  58. math,correction

    Can someone correct these for me please... Multiply. (x+2)(x-2) My answer..x^2-4 Write in descending-exponent form, and give the degree 4x^5+x^8-7 My answer: In descending-exponent form would be: x^8+4x^5-7, The degree is 8 Multiply. 3xy^2(5xy-4x+6y) My

    asked by jas20
  59. math

    choose most reasonabl unit of measure .write mm,cm,dm,m,km thickness of a window When you consider that a meter = about 39.6 inches, what would be the most reasonable unit to measure the thickness of window? mm = 1/1000 m cm = 1/100 m dm = 1/10 m km = 1000

    asked by Anonymous
  60. English

    What are some words to describe the tone of an author's diction? This list comes that an AP English teacher in Raleigh, NC gave her students. TONE WORDS: angry, sharp, upset, silly boring, afraid, happy, hollow, joyful, sad, cold, urgent, joking, poignant,

    asked by Jean
  61. Science

    What does an object have to have so that it can float on top of water? The object must be less dense than water or displace a volume of water greater than the mass of the object It has to be light

    asked by Emily
  62. diagonals

    What are diangonals when it's saying 'list the diagonals'? what are diagonals? Look up "diagonal" in your dictionary or the one on the internet. That will give you a better idea of what you are looking for.

    asked by Hannah
  63. Economics

    The economy consists of the following: - working-age population: 20M - full time employment: 8M - part-time employment: 2M (1M of whom wish they had full-time jobs) - unemployment: 1M If 0.6M of those unemployed are frictionally, structurally, and

    asked by Freddy
  64. Grammar

    Which sentence is correct? 1. Donna is taller than I. 2. Donna is taller than me. No one at school is sure about this answer. Donna is taller than I. If you say it from your perspective you would say: I am taller than Donna. Not, Me is taller than Donna.

    asked by Jane
  65. help

    can u give me website on industrializationand how it affected workers? during 1865-1914 http://en.wikipedia.org/wiki/History_of_the_United_States_(1865–1918)#Industrialization_and_immigration THANXS

    asked by Anais
  66. English

    find 4 to 6 credible web sites or articles that support, oppose, or simply present information about bilingualism in education or politics.

    asked by jeana williams
  67. SPANISH

    QUE PASA? TA BIEN? QUE LO QUE? WHAT DOES THIS MEAN. IT MEANS..WHAT HAPPENED? ARE U OKAY? QUE LO QUE IS MORE SLANG FOR HOW ARE U? Thank you for using the Jiskha Homework Help Forum. ¿Qué pasa? means "what is happening." The 2nd is probably "está bien" =

    asked by A
  68. chem

    oh thanks If you have CH4, does the 4 apply to both the C and H or only to the H? It is the H that is four. only the H

    asked by Lydia
  69. Conversion

    After finishing a Chem problem, I arrived at a answer of 176764.8987 M. How would I convert that to uM/L (micromolar) If M is molar, your number is quite unrealistic. Multipy Molarity by one million to get micromoles per liter.

    asked by Meche
  70. math

    How do I calculate the area of a triangle? To calculate the area of a triangle, multiply the base times the height and divide by 2. http://www.mathopenref.com/trianglearea.html 1/2 of the base of the triangle times the height.

    asked by Jim
  71. Capital Markets

    You work for an underwriter. The underwriter asks you to ¡§strip¡¨ a portfolio of treasury bond. The treasury bonds in question are all identical, they have 5 years to maturity, pay an annual coupon of 7.25% per year, payable annually, and they are

    asked by joe
  72. science

    A substance that loses its shape under certain conditions is called what? A liquid takes the shape of its container.

    asked by Sarah
  73. biology

    What chemical fuel powers all cell activities? Since this is not my area of expertise, I searched Google under the key words "cell metabolism chemical" to get these possible sources: http://www.answers.com/topic/cell-metabolism I hope this helps. Thanks

    asked by Maddy
  74. Capital Markets - Bonds

    You are buying right now a zero-coupon bond. It has exactly 8 years to maturity, and you expect the YTM to be 6% over the bond’s life. Even though you intended to hold it to maturity, you end up selling it after 3 years. By that time, the bond’s YTM

    asked by joe
  75. spanish

    what does this mean...recibe pesos mexicanos... Thank you for using the Jiskha Homework Help Forum. Here are all the possibilities: 1. he/she/it/you-formal-singular receive(s), does/do receive, is/are receiving Mexican pesos.. (3 possible English

    asked by taylor