Most popular questions and responses by Mai
  1. Chemistry

    If 0.50L of gaseous CH4 is burned at STP, what volume of O2 is required for complete combustion? Methane burns in oxygen to produce CO2 and H2O CH4(g) + 2O2(g) --> 2H2O(l) + CO2(g) And what volume of CO2 is produced?

    asked on April 12, 2014
  2. Chemistry

    Calculate q when 0.10 g of ice is cooled from 10 degrees C to -75 degrees C (C ice= 2.087 J/ g* K)

    asked on October 20, 2010
  3. chemistry

    what are the favored geometrical arrangements for abn molecules which the A atom has 2, 3, 4, 5 and 6 pairs of electrons in its valence shell?

    asked on March 31, 2014
  4. Chemistry

    A piece of metal weighing 5.10g at a temperature of 48.6 degree Celsius was placed in a calorimeter in 20.00 mL of water at 22.1 degree Celsius. The final equilibrium temperature was found to be 29.2 degree celsius. What is the specific heat of the metal?

    asked on April 7, 2014
  5. Math

    An air conditioning salesperson receives a base salary of $2850 per month plus a commission. The commission is 2% of the sales up to and including $25,000 for the month and 5% of the sales over $25,000 for the month. a. Write a piecewise function that

    asked on January 28, 2014
  6. Math

    Angie needs to have $15,000 at the end of 6 years. How much should she deposit weekly into an ordinary annuity if it earns 6.5% interest compounded weekly?

    asked on April 22, 2014
  7. Math Help- Gr12

    The relation between the # of time in days, D, it takes for a planet to revolve around the Sun is related to the planer's average distance from the Sun, k, in millions of kilometres is defined by log D= 3/2logk-0.7 . How much longer does it take Mars than

    asked on January 18, 2010
  8. Math

    Angie needs to have an annuity payment of $1,300 at the end of each year for the next 10 years. How much should she deposit now at 10% interest compounded annually, to yield this payment?

    asked on April 22, 2014
  9. Math

    Young and Company owes bond holders $5,500 interest at the end of each quarter for the next five years. How much they deposit now at 8% interest compounded quarterly to yield an annuity payment of $5,500?

    asked on April 22, 2014
  10. chemistry

    the lattice energy for MgCl2 is -2326 kj/mol, which is much higher than that for NaCl which has a lattice energy of -786 kj/mol. Why is this so? Give at least two contributing factors.

    asked on April 3, 2014
  11. College: Chemistry

    Hi there, I need help on my homework for chemistry and I do not understand the step on how to work this problem out. Please help me with this problem: On a Sunday morning while having your breakfast you determine that you need about 2.95X10^(5)J to heat

    asked on February 15, 2009
  12. Math

    Chris and Carol just bought a $14,000 van and financed it for 5 years at 7% interest. What are the monthly payments?

    asked on April 22, 2014
  13. Finance

    Joe and Sue invested $1500 at Bank America in 2000, at 4% compounded quarterly. In the year 2005 they moved to another city and took the total money from their first investment added $500 and invested it at Bank Bravo, at 5% compounded quarterly. a. What

    asked on April 11, 2014
  14. MATH

    1. a) On Wednesday, Harry sold 3 times as many candy bars as on Tuesday. On Thursday, he sold 5 times as many bars as on Wednesday. He sold a total of 152 candy bars. How many did he sell each day? b) Bill has 5 times as many baseball cards as Fred. Tim

    asked on March 27, 2019
  15. math

    Earl Watkins is ready to retired and has saved up $250,000 for that purpose. He places all of this money into an account which will pay him annual payments for 20 years. How large will these annual payments be if the account earns 17% compounded annually?

    asked on April 22, 2014
  16. Math

    Earl Watkins is ready to retire and has saved up $250,000 for that purpose. He places all of this money into an account which will pay him annual payments for 20 years. How large will these annual payments be if the account earns 17% compounded annually?

    asked on April 23, 2014
  17. Algebra

    Airplane A travels 1400 km at a certain speed. Plane B travels 1000 km at a speed 50 km /h faster than plane A in 3 hrs less time. Find the speed of each plane

    asked on April 15, 2016
  18. Math

    Andy needs to pay off a loan of $18,000 in 5 years. Find the amortization payment he would need to take each semi-monthly pay period (twice a month) at 6% compounded bi-monthly, in order to pay off the loan.

    asked on April 22, 2014
  19. chemistry

    what is the hybridization of each atom for hydrocyanic acid?

    asked on March 29, 2014
  20. Math

    Barbara invested $12,300 at the Midtown Credit Union at 6% compounded monthly for 7 years. What is the effect rate of this investment?

    asked on April 17, 2014
  21. college: Chemistry

    I need help on this homework problem and I do not understand how to work on it. Please help me with this problem. The photoelectric work function of a metal is the minimum energy needed to eject an electron by irradiating the metal with light. For calcium,

    asked on February 15, 2009
  22. Algebra

    If an object is thrown downward with an initial velocity of v0​, then the distance it travels is given by s=4.9t sqrt 2 +v v0t. An object is thrown downward from an airplane 100 m from the​ ground, with an initial velocity of 6 ​m/sec. How long does

    asked on April 15, 2016
  23. Math

    Tim deposits $10 every month into retirement account which averages 18% interest compounded monthly. How much will be in this account after 45 years? (The number of years from age 20 to 65).

    asked on April 23, 2014
  24. Algebra

    Two pipes are connected to the same tank. When working​ together, they can fill the tank in 12 hrs. The larger​ pipe, working​ alone, can fill the tank in 18 hrs less time than the smaller one. How long would the smaller one​ take, working​

    asked on April 15, 2016
  25. Math

    Tim deposits $10 every month into a retirement account which averages 18% interest compounded monthly. How much will be in this account after 45 years? (The number of years form age 20 to 65))

    asked on April 17, 2014
  26. math

    There are fifty marbles in a sack: red, blue and green. There are ten more green than blue marbles in the sack. The probability of drawing a red or blue marble is one-half. Write and solve an equation to determine how many of each color marble is in the

    asked on March 29, 2011
  27. Math

    Hi, what is the gradient of a line that has an angle of inclination of 75°? Any help appreciated

    asked on August 14, 2010
  28. Math Need Help

    The price of a pair of trousers was decreased by 22% at $30. What was the original price?

    asked on July 27, 2016
  29. chemistry

    We calculated that 30.0 grams of ice initially at -10.0 Celsius and it requires 23.1 kj of energy to bring it all the way to a boil. How much additional energy does it take to convert all of the water to steam at 100 degree Celsius? How does this compare

    asked on May 4, 2014
  30. Math Need Help

    The price of an item changed form $140 to $100. Then later the price increase again from $100 to $140. Which of the two changes was larger in percentage in term and how much percent?

    asked on July 27, 2016
  31. Chemistry

    Calcium can also be precipitated out of the solution by adding sodium phosphate (Na3PO4) to form solid calcium phosphate. A.) write a net ionic equation for this process B.)calculate the mass of this precipitate you would generate from treating 1.000 L of

    asked on March 25, 2014
  32. Algebra

    During the first part of a​ trip, a canoeist travels 28 miles at a certain speed. The canoeist travels 9 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 3 hrs. What was the speed on each part of the​ trip?

    asked on April 15, 2016
  33. math

    if a ball is selected at random from an urn containing two red balls, three white balls and five blue balls, what is the probability that it will be a white ball

    asked on November 10, 2014
  34. Essay writing

    how to narrow down a topic about the Egyptian Revolution of 25 January for an argumentative essay??

    asked on June 11, 2011
  35. Biology

    What is the number one birth defect in California?

    asked on October 16, 2014
  36. Math

    How do you do asymptoes or what ever you call them? and how do you do the equations for the different graphs for transformation?

    asked on October 10, 2011
  37. Algebra

    Select the answer choice that most accurately evaluates whose equation is correct. Tania is partially correct. The amount of money Thu makes, y, is equal to the product of the number of jars he sells and 12, but she is correct that the booth fee is not a

    asked on January 29, 2018
  38. math

    Solution for 2/3x+x+90=180

    asked on February 27, 2012
  39. Drama

    can we consider breaking the glass menagerie twice in the play of " The Glass Menagerie" by Tennesse William a framing device??

    asked on June 14, 2011
  40. Drama

    what are the literay techniques found in a play, a novel, a short story or a poem ?

    asked on June 14, 2011
  41. Calculus

    Explain how you would use the power integration formula to integrate the function f(x) = (1/x^2)-(1/x)+(1/4).

    asked on May 22, 2011
  42. English

    whathappens to derek and roy's vow not to speak to bolivia?what do they learn from what happened?inthe story hot and cold summer

    asked on February 2, 2011
  43. Math

    What is the median of this set? {π, √25, 15%, √15, 10/4}

    asked on March 29, 2011
  44. chemistry

    Pasta packages often have different direction for cooking at high altitudes. a.) According to the directions, should you boil the pasta for a longer to shorter time? Why? b.) If the pasta water boils rapidly over medium-high heat, is there any reason to

    asked on May 4, 2014
  45. chemistry

    Based on your titration of the 150ppm standard solution of Ca2+ calculate the molarity of the EDTA solution we used, which is Ca2+ + EDTA4- ----> [CA(EDTA)]2-

    asked on March 25, 2014
  46. English

    "The boat is made of paper." Why is the made in the past tense in this sentence? What kind of grammar is this?

    asked on June 8, 2011
  47. grammar

    Is this sentence correct? She has never been missed her homework.

    asked on May 17, 2010
  48. Statistics

    You are playing a board game in which severity of a plenty is determined by rolling three dice and adding spots on the up-face. The dice are all balanced so that each face is equally likely, and the three dice fall independently. If X1, X2, and X3 are the

    asked on December 15, 2008
  49. Biology

    Compare the functions of a normal cell and that of a cancer cell with regards to cell division. Discuss the cell cycle control system and checkpoints and how these might be altered in a cancer cell.

    asked on November 5, 2007
  50. Algebra

    Ericka had 7 jars of jelly, and each was 2/5 full. How much jelly did she have?

    asked on August 30, 2016
  51. Critical Thinking

    Conditional Proofs 1. P>Q 2. R>Q conclusion is (PvR)>Q

    asked on December 2, 2015

    if one person is infected and five successive handshakes follow, how many are infected?

    asked on April 27, 2015

    explain why lysogenic conversion poses a threat to human health

    asked on April 16, 2015
  54. biology

    what is one advantage of using e. coli to study bacterial growth rates?

    asked on February 23, 2015
  55. microbiology

    e. coli 0157 is a pathogen that cannot ferment sorbitol, a sugar alcohol, to acid whereas the E. coli in our GI tract, a member of the normal flora, can ferment sorbitol to acid. What media would you use to differentiate between these two E. coli strains?

    asked on February 5, 2015
  56. Chemistry

    A mixture consists of 0.52g of X, 0.77g of Y,and 1.11 g o fZ. What is the mass % of Z in the mixture?

    asked on May 5, 2014
  57. Chemistry

    If a particular reaction evolves 192 kJ of heat while expanding from 1.00 L to 2.00 L at 125 atm of pressure, what is the overall energy change for the system?

    asked on April 12, 2014
  58. chemistry

    what is z effective? Rb+ Al3+ Mg2+ Na+ out of this set which ion is the smallest? which is the largest?

    asked on April 3, 2014
  59. write

    my question is what obstacles do i have to overcome to succeed?

    asked on June 8, 2012
  60. Language Art

    I saw a young girl (stealing, stole, steal, steals) something from the shop. which answer should it be and why?

    asked on June 5, 2011
  61. Math

    Four candidates are running for president of the student council. three other candidates are running for vice-president. how many different ways can the two offices be filled?

    asked on April 19, 2011
  62. Math

    The mean weight of 75 2nd graders is 55.7 lbs and the mean weight of 25 1st graders is 42.6 lb. What is the mean weight of the 100 children

    asked on March 28, 2011
  63. accountiing

    using the financial statements of landry's restaurant located in appendix a of the text fundamentals of financial accounting 1st ed by phillips libby and libby compute the following ratios for 2002 and 2003 a. earnings per share b. return on assets c.

    asked on August 26, 2008
  64. Algebra

    There are two questions that I am having trouble with one says Emily wants 400 ml of a solution that is 11% HC1. If she has only 8% HC1 and 16% HC1, how much of each should she use? and On a trip, Debbie spent as much time on the train as she id on the

    asked on September 16, 2007
  65. Statistics

    State the main points of the Central Limit Theorem for a mean.

    asked on June 24, 2008
  66. chemistry

    If a particular reaction absorbs 252 kJ of heat while doing 105 kJ of work at constant pressure. What are the ΔE and ΔH for values for the reaction? Is the reaction endothermic or exothermic?

    asked on April 12, 2014
  67. chemistry

    How many different N-O bond lengths would you expect to observe in the actual structure of NO3− and why?

    asked on April 3, 2014
  68. chemistry

    what is the lewis structure for N-bromosuccinimide?

    asked on March 29, 2014
  69. microbiology

    Can someone help me to answer this question please. What is the sequence of the last anticodon? What is its corresponding codon in the nontemplate strand of DNA including polarity.

    asked on October 29, 2008
  70. English Lit

    What does "your soul is the whole world" mean?? I have to write a paragraph with an example but I have no idea what to write. Thanks in advance

    asked on December 30, 2008
  1. Accounting


    posted on April 27, 2018
  2. Math


    posted on October 31, 2017
  3. Math

    Mai is saving money to buy a game. So far she has saved $18 , which is two-thirds of the total cost of the game. How much does the game cost?

    posted on February 14, 2017
  4. chemistry

    what about the delta H?

    posted on April 12, 2014
  5. chemistry

    its the ABn molecules, which is related to VSPER

    posted on March 31, 2014
  6. chemistry

    can you give me the website?

    posted on March 29, 2014
  7. Chemistry

    @DrBob222: what about the sodium phosphate?

    posted on March 26, 2014
  8. French-how to make accents

    How do u do Mme in frenc? small letters

    posted on January 29, 2013
  9. write

    the question is what has changed now that you are in school? can you give me a idea how to write this question?

    posted on June 8, 2012
  10. write

    can you give me an idea how write?

    posted on June 8, 2012
  11. math

    i don't know if i can do it...

    posted on March 29, 2011
  12. Math Help- Gr12

    opps, im sorry.. its suppose to be D = (3/2)logk - 0.7

    posted on January 18, 2010
  13. Advanced Functions math

    The original question was what i needed to solve, but with the way i changed it, is it correct?

    posted on January 18, 2010