Questions Asked on
April 30, 2007

  1. chemistry

    Can some one please balance this equation for me Fe + O2---> Fe2O3. Fe + O2 ==> Fe2O3. Here is the way to balance these equations by inspection, meaning, by trial and error. Rule #1. You may not change any subscripts. Equations are balanced by changing

    asked by Biggy Smalls
  2. chemisrty

    what is the strongest acid here? H2SO3 H2SO4 H2SeO3 H2SeO4 For oxyacids, the acidity increases with increasing number of oxygen atoms; therefore, H2SO3 and H2SeO3 will be weaker than either H2SO4 or H2SeO4. We have a problem determining which is the

    asked by luis
  3. chem 2

    indictae the reactant that is a bronsted lowry acid. HCN(aq) +H2O (l)---> H3O+(aq)=CN-(aq) HCN CN- H20 H30 i think it is HCN the weak acid substance which acts as a proton (H+) donor and CN the weak base? You are right. The HCN donates the proton (to H2O)

    asked by jane
  4. physics

    You are riding your bicycle directly away from a stationary source of sound and hear a frequency that is 2.5% lower than the emitted frequency. The speed of sound at the temperature that day is 339 m/s. What is your speed? f = f0(v + vo)/v. Here, vo is the

    asked by Coreen
  5. Chemistry

    Which of the following reactions is exothermic? 1. Na(s) --> Na(g) 2. Na(g) --> Na+ + e- 3. Cl2(g) --> 2Cl(g) 4. Cl(g) + e- --> Cl-1 My guess is 4, but I'm not sure Here is what you do. For 1, do we think it will take energy to change Na as a solid to Na

    asked by Fiona
  6. Chemistry

    for the reaction 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g) if H = -950kJmol-1, does that mean it's an exothermic reaction? Ooops pressed Post too quickly. Yes it is exothermic. Delta H is negative so heat is lost from the system. If delta H is positive a reaction

    asked by Fiona
  7. Geometry

    I had to fill out a chart stating the properties of certine shapes(parallelograms). Some of them i put to many properties please tell me witch ones i have wrong. There are wrong properties listed for some shapes because My teacher said that I have some of

    asked by Roxxy
  8. Chemistry

    Can someone help me balance this equation? MnO4(¨C) + H(+) + C2O4(2¨C)--> Mn(2+) + H2O + CO2 Sure but tell us what you don't understand about it. You need to learn how to do them yourself. Tell me what you don't understand, in detail, and I can help you

    asked by Nancy
  9. Physics repost

    A wave traveling in the +x direction has an amplitude of 0.45 m, a speed of 6.1 m/s, and a frequency of 16 Hz. Write the equation of the wave in the form given by either Equation 16.3 or 16.4. (Answer in terms of t and x. Assume standard units.) For

    asked by Mary
  10. History

    Was Hitler one of the reasons why World War II began? Yes, because he threatened world peace as a dictator when he and Germany showed agression against other countries; shortly after, WWII

    asked by Ron
  11. Chemistry

    A 10g sample of aniline hyrdochloride is dissolved in 250 mL of solution. C6H5NH2-HCl(s) => C6H5NH3+ (aq)+ Cl-(aq) H2O is shown over the arrow. What is the pH of the solution? You have added a salt to water. The pH will be determined by the (H^+) of the

    asked by Brittany
  12. Chemistry

    Only a chemist can be trusted with the combination to the safe containing a ton of money. The combination is the pH of solution A, followed by the pH of solution C. (for example: is the pH of solution A is 3.47 and the pH of solution C is 8.15 the

    asked by Danielle
  13. health

    what has been the most significant changes in health and human services over the past fifty years? Are you asking about health and human services in general in the U.S.? Or are you asking about the government Department of Health and Human Services?

    asked by Anonymous
  14. math

    Which three options are true about motion in a straight line. A. A particle which moves at an increasing velocity has a constant acceleration. B. If two particles always have the same velocity as each other, their separation does not change. C. A particle

    asked by jojo
  15. criminal justice

    What steps could be taken, if any , to reduce people's overall fear of crime? Tony, we do not do your homework for you. However, we will be happy to proofread and make suggestions after you have written your opinion.

    asked by tony
  16. chemis

    As a gas is compressed in a cylinder... 1. The distance between gas molecules _INCREASES________ 2 The number of gas molecules _REMAINS THE SAME________ 3. Its volume _INCREASES________ 4. Its pressure _REMAINS SAME________ 5. Its density

    asked by mick
  17. english

    unscrabble words giuthlns rignps

    asked by Julia
  18. astronomy

    Arcturus is about half as hot as the Sun but is about 100 times more luminous. What is its radius campared to the sun. If Arcturus is half as hot, it radiates (1/2)^4 = 1/16 as much as the sun PER UNIT AREA. But since it radiates 100 times more totally, it

    asked by rohit
  19. Physics

    I really need you answered this to my email. It's very important, for this may decide my result in the school exams, and I really need a good mark. Unfortunately, Portuguese system of education is full of problems... The question is... The altitude of a

    asked by Frederico Barreto
  20. History

    Was monotheism a genuine introduction by Islam or was it an old idea borrowed from other cultures? Monotheism was around long before Islam. The Christians and Jews are Monotheists. Monotheism, although there is debate over whether there were likely

    asked by Ryan
  21. Government

    What is the difference between a republic and democracy government? Democracy: Republic: =) Thanks! What would the educational system be like in these ypes of governments? How would the

    asked by Tracy
  22. chem plz help!

    the rate of a nuclear reaction can be changed by?? i know adding a catalyst to a normal reaction can but to a nuclear im not sure. increasing temp decreasing pressure adding a catalyst none I suppose it all depends upon how you define a catalyst. Perhaps

    asked by luis
  23. physics

    A uniform electric field of magnitude 250 V/m is directed in the positive x direction. A +12.0-ìC charge moves from the origin to the point (x, y) = (20.0 cm, 50.0 cm). (a) What is the change in the potential energy of the charge–field system? (b)

    asked by sammy
  24. Reading

    Could you explain what personal reflection on the story mean? Thank You! This question asks you how you related to and felt about the story. You might consider the following questions: How would you have reacted to the situations mentioned in the story?

    asked by Help?
  25. math

    what is the value of 11x - 2 when 7x + 3 = 17? 7 times 2=14 +3=17 11 times 2=22 -2=20

    asked by i need help
  26. math (trig)

    i have some problems doing trig the first one is: Show that cos(x/2) sin(3x/2) = ½(sinx + sin2x) i know that you are supposed to substitute all those trig function things in it but i kind of forgot how to the only that i can see substituting in is the

    asked by jacob
  27. resume help

    i have to write a resume for my english class so for my job, i want to be those people who help out customers when walking around in stores. what is that position called? is it like a sales clerk or something? don't worry, this is not my future career. i

    asked by Anonymous
  28. Inclusive Language

    She is a very capable black woman? Why do you need to repeat the gender twice? Why do you need to mention her race? How about -- She is a very capable person.

    asked by Patty Ann
  29. english

    unscrabble ttrocpe rahdocr

    asked by jill
  30. math

    2x+4(1-x)=11+5x 2x+4-4x=11+5x 6x+4=11+5x 6x=7+5x x=7 i think this is it x = 7 is not correct. Here's how the problem should work out: Use the distributive property to get rid of the parentheses and you will end up with this: 2x + 4 - 4x = 11 + 5x Combining

    asked by Sigrid
  31. Chemistry

    Only a chemist can be trusted with the combination to the safe containing a ton of money. The combination is the pH of solution A, followed by the pH of solution C. (for example: is the pH of solution A is 3.47 and the pH of solution C is 8.15 the

    asked by Dan
  32. Calculus

    How can I find the horizontal asymptote of: y=e^x/(2e^x+5) i know you have to do the limit as x approaches infinity... but that is about all i know... mulitply the numberator and denominator by e^-x y= e^0/(2e^0 + 5e^-x) y= 1/(2 + 5e^-x) now, take lim as x

    asked by Gabriela
  33. math

    The head of an industrial machine moves in a straight line horizontally backwards and forwards from a central position. The movement can be modelled using the sine wave d = 80 sin ( pie t), where d is the horizontal distance (in cm) from the central

    asked by jojo
  34. Physics

    Is Brass rod electromagnetic ? No. Brass is an alloy of copper and zinc, neither of which is ferromagnetic. As I reread your question, I don't believe I answer it adequately. I said it isn't ferromagnetic. That is true; however, you didn't ask that. A

    asked by Mrs. Cunniffe
  35. Chemistry

    As I read it, the question provides you with a word description of the production of diesel fuel, gasoline, lighter gases such as ethane and propane, as well as some of the refinery operations such as cracking. Your job is to take this word description and

    asked by DrBob222
  36. vocabulary help

    growth-oriented: i asked my dad for help in my english assignment and he gave me this word but can someone put this in simple english please. growth oreinted meaning working in company that shows progess, i guess but a better word. ambitious??? =)

    asked by dave
  37. math (final trig problem)

    Solve for x on the interval [0,π/2): cos^3(2x) + 3cos^2(2x) + 3cos(2x) = 4 I havent done trig for a while so what exactly does that mean in solving for x on that interval and how would i go about doing that? Where are you getting these tough trig

    asked by jacob
  38. finances

    Joe won a lottery jackpot that will pay him $12,000 each year for the next ten years. If the market interest rates are currently 12%, how much does the lottery have to invest today to pay out this prize to Joe over the next ten years? Mary just deposited

    asked by Tina
  39. math

    hey u there its kelsey kelsey. If you have a homework question, post it for help. We don't allow chat here, sorry.

    asked by amanda
  40. english

    Rewrite the following sentences, focusing on the grammar area specified in the left column. To enter your answer, click next to the number and begin typing. If the sentence is already correct, write No Change. Inclusive Language—Making Language Nonsexist

    asked by Nene
  41. can someone edit my paragraph thanks!

    Gorbachev did not think about all the consequences that would happened if he changed Russia into perestroika. He underestimated the effect that perestroika would have on Russia. Yes, his political initiatives were great for freedom and democracy but all

    asked by Anonymous
  42. history

    In states that allowed women to vote prior to 1920 were the women voters allowed to vote in presidental (national) elections or only local ones?'s_suffrage Very interesting -- read it, and you'll find your answers. =)

    asked by Susan
  43. govt economics

    well i am in a homeschool program and i lost my book, and have 3 more exams to do before i graduate high school. Ive tried just using the internet and google and all that to complete it, and i cannot afford a new book. the exams are all multiple choice so

    asked by bob
  44. Economics.

    I need help with these question! What are three main goals sought by policymakers in the economy? Also, I have to write an essay on ways the government can effect the economy. Which is the way that provides the most impact on the economy and why. ^I need

    asked by Kasey
  45. math

    The head of an industrial machine moves in a straight line horizontally backwards and forwards from a central position. The movement can be modelled using the sine wave d = 80 sin ( pie t), where d is the horizontal distance (in cm) from the central

    asked by jojo
  46. english

    unscrabble saocitnenrov fiubyeta jax, joe, jill, max, kayla, john, or whoever -- Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your assignment on your own. Try these:

    asked by jax
  47. RE

    What website can I find which will give me any info on heros in different countries like Muhammed Ali or Kelly Holms

    asked by mfimrk
  48. social studies

    can you help me with confearcay homework? Please repost your question, check your spelling, and be more specific. I have no idea what "confearcay" means. Thanks. =) What did the U.S. government do to the Cherokees and other tribes in the 1830's? This is a

    asked by blAH
  49. Chem

    a chemist is asked to identify 2 solutions whose labels have peeled off. One is known to contain 1.0 mol of NaCl, the other is 1 mol of Na2CO3. Both solutes are dissolved in 1 kg of water. If the chemist measures the freezing point of each solution, can it

    asked by Kim
  50. math (more trig)

    how could you do this problem? tinyurl 39jlf9 (sorry i cant get it to post because it is an internet address i cant seem to figure it out and it seems like there is not enough information or maybe i didn't pay attention in class i was able to get the one

    asked by jacob
  51. math

    can I any one help me to find a formula to calculate 401K plans for my project? Thanks Compound Interest With compound interest, the interest due and paid at the end of the interest compounding period is added to the initial starting principal to form a

    asked by jenny
  52. personal finance

    Compare a regular cash dividend with a periodic share repurchase. Which has greater appeal to you? Explain. Explain a stock dividend and further explain if you would prefer it to a cash dividend. What are stock splits and how desirable are they? In your

    asked by Tina
  53. ENGLISH Literature

    How is the idea of luck prsented in the Rocking Horse Winner? Was the boy in the story Lucky? I do think he was. i THINK the fact that he had a desire to accomplish what he set out to do he was sucessful. IT HAD NOTHING TO DO WITH LUCK One can be either

    asked by DANIELLE
  54. none

    describe a situation you are familiar with in which people based their actions or opinions on false information. How would the situation have changed if the facts were researched and presented more carefully? Obviously, this information has to come from

    asked by sara
  55. Math

    Sandra baked 2 dozen cupcakes. She frosted one half with pink icing. One eighth she covered with yellow icing. The rest were chocolate. How many cupcakes were chocolate? How did you get the answer 24/2=12 pink 24/8=3 yellow 3+12=15 24-15=9 chocolate 9

    asked by Shannon
  56. Government!

    If I could receive some guidance on these questions, I'd be ever so grateful. 1) How can a governor's message power affect legislation in a State? 2)What does the fact that aliens generally are not allowed to vote show about American beliefs? The governor

    asked by Grace
  57. english

    The minister joined the couple together as man and wife. my reply The minister joined them together as man and wife. husband or leave off as man and wife

    asked by Nene
  58. Calculus Or Something

    Find the true location of the sun in relation to your reference of the horizon if the sun is observed to make an angle of theta with the horizon. This is not an easy question. Use Snell’s law to take into account the aberration and bending of light rays

    asked by Mike
  59. Rectangles,Rhombi,and squares

    Can someone help me with this? ABCD is a rectangle. AD = x + 10, BC = 2x + 8 and CD = 5. Solve for BD. I love problems like this. Draw out a diagram. Also, use the Pythagorean Theorem.

    asked by Mike
  60. english

    unscrabble viglin tuuref

    asked by kayla
  61. english

    unscrabble funtierru sertof Thank you for using the Jiskha Homework Help Forum. And if itr is not one of those, try these links:

    asked by john
  62. math

    how would you describe how long a foot is without using numbers from "In measurement, any of numerous lineal measures (commonly 9.8 – 13.4 in. [25 – 34 cm]) based on the length of the human foot. It is used exclusively in

    asked by tyler
  63. Geology

    Can anyone help me please? I have a sample of granite, which has been determined to have a U238-Pb date of 1120 Ma. How can I find out how this was determined? I have been trying to calculate this but my brain has frozen, so any help would be appreciated!

    asked by Bean
  64. Physics

    Is a small or large decay constant best for protection against gamma radiation? Hint: Calculate half thickness. Example: Decay constants for Pb, Al, water, and Fe are 0.77, 0.16, 107, and 0.44. Which is better for radiation shielding? The larger the decay

    asked by Caleb
  65. history

    somebody can think of a clever name for a cereal box, that associates Lincoln, please tell me. thank you. Honest O's

    asked by Thomas
  66. math

    in which order do the follownig fractions go in?3/8,2/7,4/9 arrange them this way: 2/7 ; 3/8 ; 4/9 This looks like n/(n+5) at low n, this approacthes zero (n=0) at hign n, it approaches 1 (n/n) So the order listed is from lowest to highest.

    asked by giselle
  67. social studies

    what is the medical care like in a republic government? Is there any relation at all to medical care vs type of government? Didn't you believe me??!! =)

    asked by Tracy
  68. Chemistry

    Hi, I would like to know if I did this problem correctly. Your help would be greatly appreciated! "Chlorine, Cl2, is produced commercially by the electrolysis of aqueous sodium chloride. The anode reaction is 2Cl-(aq)---> Cl2(g) + 2e- How long will it take

    asked by Rachel
  69. astronomy

    The parallax of the red giant Betelguese is just barely measurable and has a value of about 0.005 arc seconds. What is its distance? Suppose the measurement is in error by + or -0.003 arc seconds. What limits can you set on its distance? 1/0.005 = 200

    asked by rohit
  70. math

    Which three options are true about the quadratic equation?? y= 4t^2 + 16t + 18 A. The graph has a minimum. B. The graph of y crosses the horizontal axis at t = 10 and t = 20. C. The equation 4t^2 + 16 + 18 = 6 has one real solution. D. The function has a

    asked by jojo
  71. english

    arbor day words to unscramble herlets degeslin Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your assignment on your own. Try these:

    asked by joe
  72. German

    Could someone please check this for me? It's supposed to be a presentation/speech, but I think I've made quite a lot of mistakes. Thanks for any help you can offer :)

    asked by Bethy
  73. science CONFUSED

    I nead help with two questions. These to questions are confusing to me for some reason. Explain how the inheritance of traits is controlled in organsims. Use the terms genes and alleled in your explanation. The allele for round seeds is represented by R.

    asked by Amy L.
  74. English/Language Arts

    My teacher has told us a number of times on how to write the "source" for writing a research paper. I keep forgetting, and I feel a little unnerved when asking her again & again. Can you please tell me how to write down different sources? Including

    asked by Danielle
  75. Science

    Hello I have an exam coming and my question is : Why do we sometimes have a tiny electical current ( spark ) when we take our sweater off because of the shirt and jacket rubbing each other , the negative charges will have static electricity But for an

    asked by Veronica
  76. Science

    Can we add an ammeter to a parallel series? An ammeter may be place anywhere in the circuit. An ammeter is always placed in series. For example Battery____Lamp__Ammeter |____________________| I need help with a bonding puzzle

    asked by Lodge
  77. Probablilty

    2 questions Roll a fair 6 sided die 3 itmes. What is the probablity that you obtain at least one 5? Use the binomial. A 28 yr old man pays $208 for a 1 year life insurance policy with coverage of $110,000. If the probability that he will live through the

    asked by Liz
  78. english

    unscrabble ceednimi jumrelbakc I am going to give you the defintion: 1) The science of diagnosing, treating, or preventing disease and other damage to the body or mind. hint: first two letters: me 2) One who fells trees and transports the timber to a mill

    asked by max
  79. cal 2

    what is the integral of absolute value of cosx

    asked by bonnie
  80. math

    find the volume of the solid formed by revoving the region bounded by the graphs of y=absoulute value cosx, x=0, x=2pi, y+x=0 about y=2 after a lot of messy calculations I got 548.2 Do you have a numerical answer?

    asked by helpless
  81. english

    Each advisor was contacted by his students. my reply 2. Each advisor was contacted by his or her students. Right. Of you could change it to All advisors were contacted by their students.

    asked by Nene
  82. Inclusive Language

    His grandmother really enjoys spending the afternoon at the center for senior citizens? I see nothing pejorative ( in that sentence. ??

    asked by Lorie S.