Questions Asked on
April 29, 2007

  1. balanced equation

    ? MnO4– + ?H+ + ?C2O42– --> ?Mn2+ + ?H2O + ?CO2 what's the balanced equation? correct coefficients? is it 1MnO4- + 2H+ + 1C2O42- --> 1Mn2+ + 1H20 + 2CO2 ? c2042..? are you missing parenthesis somewhere? oh i see, no i believe this is correct: MnO4- +

    asked by christine
  2. chemistry

    Write a net ionic equation for the reaction of the aqueous species ammonia and hydrofluoric acid. I don't think mine is coming out right- I don't know how NH3 reacts with other species, because I end up getting hydrogen as both an anion and a cation in the

    asked by Christine
  3. Math (Statistics)

    How do I go about tackling this problem? The American Medical Association wishes to determine the percentage of obstetricians who are considering leaving the profession becaose of the rapidly increasing number of lawsuits against obstetricians. How large a

    asked by Edward
  4. chemistry

    why would lowering the temp and decreasing the pressure not increase the rate of the reaction: carbon monoxide gas is combusted in the presence of oxygen gas into carbon dioxide. (DeltaH for this reaction is -285kJ.) CO + O2 ==> CO2 + heat decreasing P

    asked by alexa
  5. history

    Why did Massachusetts Federalists support Republican Aaron Burr for governor of N.Y in the 1804 election? Please tell us your answer -- and we can discuss it. Because he had power bECAUSE HE HAD pOWER???

    asked by Mack
  6. physics

    A tube is open only at one end. A certain harmonic produced by the tube has a frequency of 445.0 Hz. The next higher harmonic has a frequency of 525.9 Hz. The speed of sound in air is 343 m/s. (a) What is the integer n that describes the harmonic whose

    asked by Cavin
  7. history

    How did the Louisiana Purchase affect the size of the U.S? Look at a map of the purchase; then look at the number of square miles that was added and the number of states that were made out of the purchase. so it shortening it? """"so it got

    asked by Mack
  8. physics

    Speakers A and B are vibrating in phase. They are directly facing each other, are 7.4 m apart, and are each playing a 72.0 Hz tone. The speed of sound is 343 m/s. On the line between the speakers there are three points where constructive interference

    asked by Coreen
  9. chemistry

    sulfur trioxide gas dissociates into sulfer dioxide gas and oxygen gas at 1250 degrees C. In an experiment, 3.6 moles of sulfur trioxide were placed into an evacuated 3.0-L flask. THe concentration of sulfur dioxide gas measured at equilibrium was found to

    asked by alexa
  10. MATH

    WRITE THE GREATEST POSSIBLE ERROR FOR EACH MEASUREMENT. 43mL I don't understand the question It depends on the graduations. I assume on this beaker you have 40ml, 50 ml marks. So the 3 is an estimated digit. A safe assumption is +-.5ml error.

    asked by SANDRA
  11. chemistry

    A buffer is prepared by dissolving .0250 mol of sodium nitrite, NaNO2, in 250.0 mL of .0410 M nitrous acid, HNO2. Assume no volume change after HNO2 is dissolved. Calculate the pH of this buffer. My book does a poor job of explaining buffers and I'm really

    asked by Simpson
  12. math

    The volume of a larger prism is 168 cubic cm. if the prisms are similar with a linear ratio of 3:2 what is the volume of the smaller prism? How do i figure that out? Did you learn that the volumes of similar objects are proportional to the cubes of their

    asked by emily
  13. physics

    Describe the energy conversions that occur in each of the following devices: a. an incandescent lightbulb b. a clothes dryer c. a digital clock radio We will be happy to critique your thinking. Heat is produced in all, and some light is produced in two.

    asked by Ron
  14. chemistry

    unknown element X combines with oxygen to form the compund XO2. If 44.0 grams of element X combines with 8.00 grams of oxygen, what is the atomic mass of element X? X + O2 ==> XO2 8.00 g x (1 mol O2/32 g O2) = 0.25 mol O2. 44.0 g element X must represent

    asked by alexa
  15. Chem 2

    for the evaporation of water during perspiration on a hot dry day H is greater than zero and Tdelta S is equal to Delta H H is greater than zero and Tdelta S is gretaer than Delta H H is greater than zero and Tdelta S is less than

    asked by ok
  16. ENGLISH Literature

    In "The Open Window" What does "Romance at short notice was her speciality" means? Does it means that romance was all she had to live by. She had no other interest? Thanks Much!!!! Thank you for using the Jiskha Homework Help Forum. Could it mean she fell

    asked by DANIELLE
  17. math

    Please help me to find the first and third quartiles, Q1 and Q3, of the following set of numbers.13, 7, 15, 13, 13, 12, 9, 11, 19, 9 Qrrange the numbers in ascending order, like this: 7, 9, 9, 11, 12, 13, 13, 13, 15, 19 Now divide then into the lowest

    asked by carmen
  18. history

    What were the 2 most valued possessions of the pioneers that owned the conestoga wagon? You may be able to find your answer in this site, although I didn't see anything about most valued possessions. I would say

    asked by Mack
  19. to record admission of new partner into partnershi

    I was just wondering if anyone could help me with the following problem. I am not sure even where to start. Reed, Sharp, and Tucker were partners with capital account balances of $80,000, $100,000, and $70,000, respectively. They agreed to admit Upton to

    asked by undecided
  20. history

    What vital right did the Spanish allow the Western farmers? Answer: It was that Spain allowed Americans to travel on the lower Mississippi to New Orleans and to ship their goods. "cORRECT right??" mmhmm Can you help me out with this one???? Did you ever

    asked by Mack
  21. Chemistry

    Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4– + C2O42– Mn2+ + CO2 MnO4– + Fe2+ Mn2+ + Fe3+ ? The potassium ion is a spectator ion. You have written ionic equations (but omitted the arrows to separate

    asked by Emi
  22. chemistry

    Okay, so apparently ASA and FeCl3 form a violet complex and FeCl3 forms with phenol groups to make purple. Looking at the structures of ASA and salicylic acid, only salicylic acid has the phenol group. The thing is, salicylic acid is supposed to be an

    asked by Andrea
  23. history

    Can someone please check my answers? I have to put the sequence in order that the events happened. 9.The Lewis and Clark expedition leaves st.louis 8.thomas jefferson authorizes robert livingston to offer $10million for new orleans and west flordia.

    asked by Mack
  24. English

    I am doing a reading comprehension project and I need to find a book and a song about "the elderly". Please Help!! do you mean like about old people or a book called The Elderly? about old people. about old people. hang on I'll look google Books About the

    asked by Suzanne
  25. music

    where can i get free instrumental music, like music with out anyone singing in it, just the music background? Thank you for using the Jiskha Homework Help Forum. Here are some sites for you: 1. 2. (Broken Link Removed) 3.

    asked by haya
  26. history

    Which one matches??? k. because of his urging, the election of 1800 was finally settled L. set up regional courts for the U.S with 16 judges and other officials. I. claim by an Adams appointee to force the delivery of his commission. F. appointed chief

    asked by Mack
  27. physics

    An organ pipe is open at both ends. It is producing sound at its sixth harmonic, the frequency of which is 257 Hz. The speed of sound is 343 m/s. What is the length of the pipe? m open: doesn't this mean the length is equal to n/2 wavelengths, where n=

    asked by Cavin
  28. help

    i need help solvin this quadratic equation 2x^2+x-6=0 1/3x^2+8x-3=0 Try to factor, then set the factors equal to 0 to find possible solutions for x. For the first one: 2x^2 + x - 6 = 0 Factors are: (2x - 3)(x + 2) = 0 Setting the factors equal to 0: 2x - 3

    asked by jc
  29. Discrete Math

    You are stranded on a deserted island, and along the way you stumble across a genie. He says he will get you off the island provided that you can meet his conditions. He hands you a 20-sided die, and says that you need to roll it 1000000 (one million)

    asked by Bob
  30. Calc Help

    demand = (p+1)sqroot(q+1)=1000. Find elasticity of demand at a price of $39 per unit. I am really struggling with this problem is there anyone that can help me? i am not familiar with the terminology, but if you are trying to solve for p, it is not that

    asked by Rob
  31. history

    Why was Thomas Jefferson alarmed to learn that the French controlled the Louisiana Territory? Answer: He was worried about American trade on the Mississippi River. The U.S was afraid that France, under Napoleon Bonaparte, wanted to build empires in North

    asked by Mack
  32. thermodynamics

    Which of these statements are in accord with the three laws of thermodynamics? -A-The entropy of the universe never decreases -B-A nonspontaneous process can occur if it is coupled to a process which is sufficiently spontaneous -C-The temperature of the

    asked by anonymous
  33. chemistry

    Which factors below affect the rate of a chemical reaction? -Collision frequency -Number of collisions having the least activation energy -Intermolecular orientation -Being Exothermic or Endothermic Also, what formula would I use for this problem: "What is

    asked by anonymous
  34. history

    What enormous area of land was anchored to the South by the city of New Orleans? So it's the Mississipi River right? Isn't it Louisiana? No the Louisiana Purchase yes. :') Who informed American diplomats that

    asked by Mack
  35. Math

    How do you get a slope if you only have the y-intercept. example: (0,5) and (-3, -4) To find slope: slope = (y2 - y1) / (x2 - x1) With your values: slope = (-4 - 5) / (-3 - 0) = -9/-3 = 3 I hope this will help and is what you were asking.

    asked by Sissy
  36. Geology

    1b - I have to draw a cross section showing the relationship with gabbro cutting across sandstone and schist with schist being the oldest. 1c - I have to write a brief geological history of the region starting with the oldest events. 200 words. Thanks

    asked by Desmond
  37. chemistry II

    What is most likely to oxidize out of the following transition metal:? Platinum, copper, gold, palladium, silver? i believe its copper but check and see if i am right

    asked by markr
  38. Calc Help

    Marginal Cost = 30sqroot(x+4) with fixed costs of $1000. Marginal Revenue = 900. find profit or loss from production and sale of 5 units. how many units will result in a max profit? what is the max profit? Can someone please help. Trying to review for my

    asked by Rob
  39. Living Environment

    Could someone please explain what biomass means? Does it just mean how much energy an organism has? thanks, Lance!='} what is increased amounts of nitrogen and phosphorus in a lake

    asked by brie
  40. Math (typo in first)

    How do I go about tackling this problem? (I made a problem-modifying typo in the first) The American Medical Association wishes to determine the percentage of obstetricians who are considering leaving the profession becaose of the rapidly increasing number

    asked by Edward
  41. microbiology

    can anyone help me to figure out how to work out STANDARD DEVEATION CALCULATIONS please? Do you have a specific example? There are formulas for standard deviation you can use if you are expected to do the calculations by hand. You can also use calculators

    asked by nicky
  42. history

    What happened after the Electoral College voted in the election of 1800? Lots of interesting information in here. =)

    asked by Mack
  43. Math: Algebra2 Logarithms

    Can someone help me find the value of B in this expression???? log 64 = Blog 4 5 5 Grrr... sorry about that. Here's the expression again: log (base = 5) 64 =B log (base = 5) 4 log 64 (base5) = log 4^b (base5) so 64 = 4^b by recognition of 64 as a power of

    asked by UnstoppableMuffin
  44. english

    Hi I have to give a presentation in which I must speak of my author Ernest Hemingway, the presentation must include *definiton of genre *list of major figures working in the genre *features of the genre (and special features of any sub-genre) I'm also

    asked by claudia
  45. Math

    The area of a regular pentagon with a perimeter of 35 units. Join the centre to each vertex to form 5 eq Join the centre to each vertex to form 5 equal triangles. Consider one of those triangles the central angle is 72º and each of the other two equal

    asked by Kate
  46. social studies

    how did Mikhail gorbachev affect the government? What did Boris Yeltsin do and how did he affect the government? Please don't give me any links. Please note that we don't do students' homework for them. Our tutors try to give you the information to help

    asked by Parth
  47. algebra

    i have two answers to this problem so am not sure which way I need to do in or should say the order i should do it. lease help??????? problem is 7x-5+3x=6+x-10 what is the order to work this out there is no brackets to this problem 7x-x+3x=6+5-10

    asked by Anonymous
  48. derivative

    q=(100/p+1)^2 - 1 what is q'? use the chain rule: q' = 2(100/p+1)(-100/(p^2)) i got q' = 2(100/(p+1))(-100(p+1)^-2 =-2000/(p+1)^3

    asked by Evan
  49. poetry

    i need to write a poem about my life it has to be a simile poem. Life is like a ___________ and 10 lines about that thing i need an idea of what to write about plz help! a bowl of fruit? a new car getting old? a box of chocolates? a popsicle on a hot day?>

    asked by anonymous
  50. essay

    what is the most important issue facing the global economy? explain the issue in detail and your reasoning for it being so important. I say globalization and someone said that was too broad so I narrowed it down to international trade foreign exports

    asked by Greg
  51. history

    on the 1st page can someone please help me??????? Its the 2nd and 3rd black dot next to my nasme. Even if this is a repost, more information needs to be given before we can adequately respond. Please repost with more information. Thanks for asking.

    asked by Mack
  52. biology

    can anyone help please??? im asked to explain the meaning of glycosidic C1 - C4 Linkage. Im not 100% clear on it!! Any ideas?? Thanks C1 is the carbon on one molecule, C4 is a carbon on another molecule, Since C1 and C4 or on opposite ends of the glucose

    asked by bertie
  53. Finance

    Conduct Break-Even Analysis in the following two scenarios: R Squared is a mobile diagnostic imaging company that performs MRI scans of patients at hospitals and clinics that cannot afford their own scanners. General Hospital has contacted R Squared

    asked by sarah
  54. Calculus

    Find the area between the curve y=4/x and the x-axis from x=1 to x=e. It is a review question for my final exam and I am really stuck on how to solve You should hope for a final exam question so easy. area= INT y dx= INT 4/x dx from 1 to e area= 4ln x from

    asked by Evan
  55. math

    Is it equally likely that a tack will land point up ot point down? Explain it to me please. It has to be point up because the head of the tack weighs more than the point of the tack. So something that weighs a little more than the lighter end will pull its

    asked by Victoria
  56. chemistry!

    [blank] mL of 6.0 M H2SO4 are needed to prepare 300 mL of 1.0 M H2SO4 solution. 50 mL x M = mL x M (works for dilution problems but not for all stoichiometry problems.)

    asked by Emi
  57. chem

    what has an sp2 hybridized carbon? Amine Alcohol Keytone Ethers Aldehyde

    asked by markr
  58. History

    Could someone please find me a website that has great information on Business enterprise in America so I can make a timeline on it. Specific dates that I need are 1906, 1913, 1914 , 1930, 1939. I would greatly appreciate it. This site seems to have the

    asked by Dave
  59. genetics

    after 30 seconds of translation you treat a cell with a chemical that blocks the P site on the ribosome so that it does not function anymore. describe what was happening prior to the treatment of the ribosome, and what would happen after the treatment of

    asked by cookie
  60. criminal law

    could someone pls give me a proper explantion for policy and procedures---i need to write a paper on a case and use these terms but i don't know the explantions....thank you so much Procedures is how something is done. Policy sets up guidelines that the

    asked by kathy
  61. english essay

    "research a controversial issue, either comtemporary or historical, and explain how the audience is positioned by newspapers to view the issue." can someone please tell what "how the audience is POSITIONED by newspapers" mean? It's very rare lately that

    asked by Twinkle
  62. english

    anyone know some controversial issues in the news papers lately?if so, please tell me.i really need it.=) thanks! Go to Read through the stories. Find one that interests you. It might be a local, national, or international story.

    asked by Twinkle
  63. algebra

    how do i work out 2/5x-6=12 your post shows how important it is to use brackets to avoid ambiguity. do you mean (2/5)x-6=12 ? or 2/(5x) - 6 = 12 ? or 2/(5x-6) = 12 in any case, cross-multiply and your fractions are gone. then solve as a simple basic

    asked by Anonymous
  64. history

    Who informed American diplomats that the Louisianna Territory was for sale? Answer: Was it the French or Spain or was it someone else? France, right? I NEED HEEEEEEEEEEEEEEEEEEEEELLLLLLLLLLLPPPPPPPPPPPPPPPP!!!!!!!!!!!!!!!!!!

    asked by Mack
  65. Conducting a Buddhist-Style Fast

    Hi everyone! In my quest to better understand Buddha and his teachings, I have decided to conduct a three-day fast in the hopes of having an experience of enlightenment. I got permission from my school to take three days off from school this week

    asked by Tyler
  66. English

    Please help me! I need the title of a book that's subject is based on ignorance and another on choice or making a decision. Harper Lee's To Kill a Mockingbird will fit both criteria in certain ways. A more recent book along similar lines is Grisham's A

    asked by Cynthia
  67. MATH

    Please help me to find the least common multiple of 24 and 48. 1st go to this site: Then give it a whirl and post what you think the answer is and we'll see if you need further help.

    asked by carmen
  68. chem 2

    which bronsted lowry acid has the strongest conguate acid? acetate ion flouride ion cyanide ion nitrate ion not flouride that's for sure

    asked by jay
  69. Calc Help

    I need to find dq2/dpb and dqb/dpa qa=2500+(600/pb+2)-40pa qb=3000-100pb+(400/pa+5) a and b are subscripts.

    asked by Rob
  70. math

    what is a parabola

    asked by matt ferrisi