Mai

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?

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)

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?

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?

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

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?

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

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?

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?

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.

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

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?

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

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

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?

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?

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

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.

19. chemistry

what is the hybridization of each atom for hydrocyanic acid?

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?

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,

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

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).

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​

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))

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

27. Math

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

28. Math Need Help

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

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

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?

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

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?

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

34. Essay writing

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

35. Biology

What is the number one birth defect in California?

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?

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

38. math

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

39. Drama

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

40. Drama

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

41. Calculus

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

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

43. Math

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

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

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-

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?

47. grammar

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

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

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.

50. Algebra

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

51. Critical Thinking

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

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

explain why lysogenic conversion poses a threat to human health

54. biology

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

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?

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?

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?

58. chemistry

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

59. write

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

60. Language Art

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

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?

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

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.

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

65. Statistics

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

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?

67. chemistry

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

68. chemistry

what is the lewis structure for N-bromosuccinimide?

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.

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

1. Accounting

423000

posted on April 27, 2018
2. Math

60

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

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