# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

92,096 questions, page 718
1. ## Math

Sue, got a raise at work her current wage was \$32.500 a year her new wage is 35.500 a differents of \$3.000 per year how do I come up with her hourly wage she is paid is every 26 weeks?

asked by Cathy on February 13, 2010
2. ## Physics

A Carnot refrigerator is used in a kitchen in which the temperature is kept at 301 K. This refrigerator uses 216 J of work to remove 2360 J of heat from the food inside. What is the temperature inside the refrigerator?

asked by Tim on May 5, 2013
3. ## Math

Shelly is working 250 math problems and she wants to finish in 6 days. If she works the same number of problems each day for 5 days how many problems will she have left to work on day 6?

asked by Valerie on March 21, 2016
4. ## physics

A ball rolls off a shelf with a horizontal velocity of v. At what horizontal distance from the shelf does the ball land if the height of the shelf is h above the floor? can anyone at least give me the formulas to work with?

asked by Anonymous on May 24, 2010
5. ## heat transfer

how microwave ovens work,and explain how they cook much faster than conventional ovens.Discuss whether conventional electric or microwave ovens consume more electricity for the same task.

asked by akalili on March 8, 2015
6. ## physics

A 5kg bucket of water is raised from a well by rope. If the upward acceleration of the bucket is 3.0m/s^2, find the force exerted by the rope on the bucket. Work: F=(5kg)(3m/s^2) However, the answer given is .64 N.

asked by Anonymous on October 14, 2007
7. ## Chemistry

The tomato is dropped. What is the velocity, v, of the tomato when it hits the ground? Assume 94.7% of the work done in Part A is transferred to kinetic energy, E, by the time the tomato hits the ground.

asked by Caitlin on December 7, 2014
8. ## o-chem

30g malononitril in 300ml water, soluabiltity 20g/100ml in ether...13.3g/100ml water. what weight recovered by 3 100ml extractions using ether..i need help..how to work??

asked by reba on August 30, 2009
9. ## calculus - interval of convergence

infinity of the summation n=0: ((n+2)/(10^n))*((x-5)^n) .. my work so far. i used the ratio test = lim (n-->infinity) | [((n+3)/(10^(n+1)))*((x-5)^(n+1))] / [((n+2)/(10^n))*((x-5)^n)] | .. now my question is: was it ok for me to add "+1" to "n+2" to become

asked by COFFEE on July 30, 2007
10. ## maths

carl thought of 5 numbers and told danny all the sums that could be made by adding the numbers in pairs. the list of sums is given below. what are the five numbers 6,7,8,8,9,9,10,10,11,12 I thought of 34426 but the 11 does not work

asked by Yasmin on October 30, 2014
11. ## Algebra

Find two consecutive odd integers such that 5 times the first integer is 12 more than 3 times the second. I've gotten this far but confused as to what the two intergers are. 5x=3(x+2)=12 5x=3x+2+12 5x=3x+14 2x=14 2x/2x=14/2 x=7 Let n be first integer, so

asked by Amanda on April 22, 2007
12. ## Math

A bag contains 6 red marbles, 3 white marbles, and 7 blue marbles. You pick a marble without looking. Find the probability of drawing a white marble. Can someone please explain how I would work this out?

asked by Emily on May 21, 2018
13. ## science

A 3.0-kg block is on a frictionless horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 2.0 N) acting at an angle of 22° above the horizontal is applied to the block. At what rate is the force P doing work at t = 2.0 s?

asked by songezo on April 15, 2019
14. ## chemistry

The tomato is dropped. What is the velocity, v , of the tomato when it hits the ground? Assume 91.9% of the work done in Part A is transferred to kinetic energy, E , by the time the tomato hits the ground.

asked by maxime Jones on November 15, 2014
15. ## Math

Yvette earned \$66.00 for 8 hours of work. Lizbeth earned \$68.80 working the same amount of time. How much more per hour did Lizbeth earn than Yvette earned? a. \$0.35 b. \$0.45 c. \$2.80 d. \$8.25 Answer-c Please check the above.

asked by Patrick on February 17, 2016
16. ## math

Emily's family loves to work together in the garden. They have a slight preference for flowers, as 60% of their plants are flowers and 40% are vegetables. They have 50 plants growing in the garden. How many vegetable plants do they have?

asked by person on December 15, 2014
17. ## physics

A worker pushes a wheelbarrow with a force of 40 N over a level distance of 6.0 m. If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?

asked by Anonymous on November 17, 2010
18. ## math

Emily's family loves to work together in the garden. They have a slight preference for flowers, as 60% of their plants are flowers and 40% are vegetables. They have 50 plants growing in the garden. How many vegetable plants do they have?

asked by halo on January 7, 2015
19. ## physics

To recharge a 12 V battery, a battery charger must move 2.7 × 105 C of charge from the negative terminal to the positive terminal. How much work is done by the battery charger? Answer in units of J

asked by Anonymous on April 16, 2012
20. ## physics

Which of the following is correct for the energy levels in an atomic system? Choose one answer. a. The energy value increases with the distance from the nucleus. b. The energy value decreases with the distance from the nucleus. c. The energy value remains

21. ## Gravity, fields

Question 1) Consider two point-like objects, A and B, the first of which has four times the mass of the other (i.e. MA = 4MB). They are placed a certain distance d apart. (i) Sketch (in 2-dimensions) the gravitational field lines that are present in the

asked by Anon on December 13, 2017
22. ## algebra-det.

a) Suppose that B is an n ¡Á n matrix, and k is a scalar. Give a formula for det (kB) in terms of det B . b) Show that your formula from (a) is true for all n and for any k. det (kB) = k^n det B This is because the determinant is a multilinear function

asked by Vidal on June 10, 2007
23. ## Chemistry Help.......

State the Le Chatelier's principle and explain the following i) The effect that incresing the pressure will have on the eaualibrium yield of methanol ii) The effect of increasing the temperature will have on the equalibrium yeild of methanol iii) The

asked by Lacey on March 12, 2007
24. ## chem

the element nitrogen and magnesium react to give magnesium nitride according to the balanced equation N2 + 3Mg = Mg3N2 suppose you have 0.3616 mol of n2 1-how many moles of mg are needed for complete reaction? 2-what mass of Mg3N2, in grams can be

asked by burrprett on September 27, 2011
25. ## math, calculus

Interference Two identical tuning forks are struck, one a fraction of a second after the other. The sounds produced are modeled by f1(t) = C sin ωt and f2(t) = C sin(ωt + α). The two sound waves interfere to produce a single sound modeled by the sum of

asked by MaryJane on June 22, 2018
26. ## biology help plz?????????????????

the mRNA squence below is shown along with the polypeptide which would be produced when it is translated .what polypeptide would be produced if the fifth base in the mRNA sequence shown had been changed to A as result of a mutation in the DNA from which

asked by centya on February 2, 2013
27. ## algebra

Your research the average cost of whole milk for several years to look for trends.the table show your data what is the equation for a line of best fit how much would you expect to pay for a gallon of milk in the year Year 1998-2000-2002-2004-2006-2008 Cost

asked by snow on March 13, 2014
28. ## Chemistry

Assuming that the specific heat of the solution is 4.18 J/(g⋅∘C) and that the calorimeter itself absorbs a negligible amount of heat, calculate ΔH in kilojoules for the reaction CaO(s)+H2O(l)→Ca(OH)2(aq) When 1.045 g of CaO is added to 50.0 mL of

asked by Tyler on April 20, 2014
29. ## Chemistry

Devise a scheme for separating Al(NO3)3, AgNO3, Ca(NO3)2, and KNO3 from each other. The hint provided is to use the Ksp tables. Also, how could you isolate KNO3 from the solution in this question? How about using the Ksp tables and giving us your thoughts?

asked by Vanessa25 on May 7, 2007
30. ## chemistry

What mass in grams of potassium hydroxide is contained in 500 mL of solution that has a pH of 11.5? I have a pOH of 2.5 to get [OH] I do 10^-2.5 to get 0.001581138 Then I divide this by 2 to find the mols in 500 mL Then, grams = mols x molar mass =

asked by Dustin on April 7, 2008
31. ## Chemistry

In the presence of an acid catalyst, salicylic acid reacts with methanol to produce oil of wintergreen and water. If water is added to the solution, a precipitate is formed. Identify the precipitate and explain why it is formed. Don't understand...!

asked by Elizabeth on June 2, 2012
32. ## chemistry

When 18 g of ethylene glycol C2H6O2 is dissolved in 150 g of pure water, the freezing point of the solution is ___ (degrees)C. ( The freezing point depression constant for water is 1.86(dgrees)C kg/mol. I know the formulas I just need to see it done step

asked by Jared on August 4, 2008
33. ## chemistry

The Kb of ammonia is 1.8 x 10–5. What is the percent ionization of a solution of ammonia, 0.50 mol L–1 NH3, that contains 0.020 mol L–1 of ammonium nitrate, NH4NO3? when i use the ICE table i don't end up with an unknown so im not sure what to do.

asked by James on June 9, 2016
34. ## chemistry

I thought about the syntax of the problem and I have surmised that what I thought were two questions was actually one. I'm slow but not dead yet. 75g of tartaric acid in 1 liter is used in a titration. 25mL of tartaric acid solution is titrated against

asked by What? on October 7, 2012
35. ## How many milliliters of a stock solution of 6.00 M

How many milliliters of a stock solution of 6.00 M HNO3 would you have to use to prepare 0.190 L of 0.490 M HNO3? I used the equation M1V1=M2V2 6M*V1 = 0.190L*0.490 M lead me to this V1=0.190L*0.490M/6.00 M =0.0931 L per M/6.00M =0.0155166L

asked by Sara on August 28, 2015
36. ## physics

A 2 kg block situated on a rough incline surface (θ= 37o) and is connected to a spring with k = 100 N/m. The block initially at rest. The block moves 20 cm down the incline before stops. Find the coefficient of friction between the block and the surface.

asked by charley on September 6, 2012
37. ## Chem

In acidic solution MnO4- oxidizes H3AsO3, a weak acid, to H3AsO4, a weak acid, and is reduced to Mn2+. Write the balanced net ionic equation for this reaction. How many H+ are there in the balanced equation? Question 8 answers

asked by EJ on February 22, 2011
38. ## Chemistry

Based on the average number of moles of IO3- in your samples, and the initial volume of those samples, what is the solubility of Ca(IO3)2 in mol/L of the saturated solution in 0.01 M KIO3? My average molarity was: .000092 My sample volume was: 5ml or .005

asked by Ane on March 11, 2015
39. ## chemistry

Suppose that 50.0 cm3 of 2.00 M hydrochloric acid are added to 4.00 grams of zinc metal. What it the limiting reagent? How many grams of zinc are actually consumed? What is the concentration of the hydrochloric acid solution after the reaction has

asked by Fania on November 8, 2010
40. ## Chemistry

When 20.1 g Sb2S3 reacts with an excess of Fe, 9.84 g Sb is produced. What is the percent yield of this reaction? My work so far... converted 20.1g of Sb2S3 to moles 20.1/149.8=.134 .134Sb2S3*2moles Sb/1 mole Sb2S3=.268*121.7=32.6 of Sb

asked by Gianna on February 8, 2015
41. ## language arts

in " all together now " , Jordan uses appeals to emotion and appeals to reason to try to persuade her readers that her views are important . in a paragraph , site one example of each king of appeal in her work . then , explain whether you find jordans

42. ## History

To rule his empire successfully, hammurabi instructed his own governors__________. A.To teach local rulers. B.To rule distant cities. C.To train his sons to rule. D.To cut off communication with the outside world. I think its B but I can find anything in

asked by Anonymous on October 1, 2018
43. ## Math

So I am supposed to solve this without using a calculator: Sqrt[20]/10 - Sqrt[10]/Sqrt[32] - Sqrt[0.3125] + Sqrt[3 + 1/5] You can put this into WolframAlpha as is to make it prettier. Answer given is 1/2 * SQRT(5) I really don't know where to start here. I

asked by Mr.AMG on April 17, 2015
44. ## Chemistry

Acetic anhydride, C4H6O3, has a normal boiling point of 139.8 C (ie, at 1.013 bar) and a standard enthalpy of vaporization of 51. 9 KJ mol^-1. What is the vapour pressure of acetic anhydride at room temperature (298 K) in units of bar? Can someone help me

asked by FS on July 28, 2018
45. ## Algebra 1 word prob

For the period 1985-2001, the average salary "y"(in thousands of dollars) per season of a Major League Baseball player can be modeled by y=7x^2-4x+392 where x is the number of years since 1985. Write and solve an equation to find the year when the average

asked by Ⓔ.Ⓣ.Ⓦⓐⓩ Ⓗⓔⓡⓔ on August 30, 2013
46. ## Physics

To construct a solenoid, you wrap insulated wire uniformly around a plastic tube 12 cm in diameter and 45 cm in length. You would like a 2.0-A current to produce a 2.1-kG magnetic field inside your solenoid. What is the total length of wire you will need

asked by Valerie on March 24, 2013
47. ## algebra

To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. Write an equation using only one variable

asked by Nikki on November 22, 2010
48. ## Math

Create an inequality for this problem and solve. Devon works in a sporting goods store. She makes \$1250 a week plus 16% commission on everything she sells. What is the minimum she would have to sell in order to make at least \$4000 in a week. This is my

asked by Cherie on June 2, 2019
49. ## algebra

To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. Write an equation using only one variable

asked by Anonymous on November 18, 2010
50. ## PHYSICS

HOW DO YOU FIND THE VELOCITY OF A 20 kg SOLID CYLINDER WITH A .25 m RADIUS WHEN IT IS RELEASED FROM THE TOP OF A 10 m LONG RAMP INCLINED AT 30 DEGREES? The potential energy at the top is mg10/sin30 The Ke at the bottom is 1/2 mv^2, plus 1/2 Iw^2 but w= v/r

asked by NICOLE on December 12, 2006
51. ## math

A traveler travels on a highway 80 miles at 55 miles per hour, he then travels back on the same highway at 45 miles per hour. What was his average rate of speed. (Hint: it's not 50 miles per hour) If it's not 50, i'm so confused!!! Please help!!! (and

asked by Ashley on December 2, 2009
52. ## Science/misc

If Person A is smarter than Person B why would their teacher say "Person A has more brain than person B" when all human brains are an equal size? (Is it just a saying to show the point?) Also, if all brains are the same size then why are some people

asked by mysterychicken on February 17, 2009
53. ## Creative Writing

The description moves from the broad category of transportation to a concrete, detailed image. The underlined words show how the image moves from the broadest category to the concrete, detailed image.

asked by Fats on June 30, 2009
54. ## Algebra1

Sally bought some ordinary pencils and 4 times as many special pencils. Each ordinary pencil cost \$0.20 and each special pencil cost \$0.35. She spent \$14.40. How many of each pencil did she buy? Please show me how you got your answer. Thank you.

asked by Samantha on October 5, 2009
55. ## Math

1. if 60% of 3/5 of a number is 36, then the number is......... Pls show working. 2. the average weight of 16 boys in a class is 50.25kg and that of the remaining 8 boys is 45.15kg. Find the average weight of all the boys in the class.

asked by Bright on April 20, 2015
56. ## CS programing

Storage: .data 2 0 ; storage for n22 .data 2 0 ; temp storage 23 .data 2 2 ; constant 2 24 .data 2 2 ; const 2 25 0 10 ;const 10 26 please can u show me the correct way to declare a constant using wombat.(CPU sim).

asked by lex on March 20, 2014
57. ## Maths calculus

A rectangular box has a square cross-section and the sum of its length and the perimeter of this cross-section is 2 m. If the length of the box is x m, show that its volume V m^3 is given by V = [x(2-x)^2]/16. Hence find the maximum volume of the box.

asked by Stephen on May 24, 2011
58. ## Psychology

Individuals who naturally exhibit low levels of brain arousal and nervous system reactivity are more likely to: A. Score high in measures of agreeableness B. Score low in measures of agreeableness. C. Score low in measures of sensation seeking D. Score

asked by Macy on December 9, 2014
59. ## Data Management

Sorry...i wrote the previous questions wrong.. The producer of HB pencils has 720 pencils randomly chosen from each day's productions. A defect rate of 15% is acceptable. a) Assuming that 15% of all manufactured pencils are defective, what is the

asked by Jamey on January 13, 2008
60. ## Principles of Management - Effective Management

Please double check my answers please! 1. a team manager is resolving the conflicts that exist among the members of his team in an organization. this is an example of: a. planning b. organizing c. leading d. controlling answer C 2. a manager at a grocery

asked by Amanda on July 10, 2012
61. ## accounting-installment sales journal entry

Question: On 12/31/07, Company A sold equipment for \$1,800,000. The equipment had a carrying amount of \$1,200,000. At the time of the sale the buyer paid \$300,000 cash and signed a \$1,500,000 note bearing interest of \$1,500,000 note bearing interest at 10%

asked by Toni on October 24, 2008
62. ## ethics

This is the question i was asked, "The things that will destroy us are: politics without principle; pleasure without conscience; wealth without work; knowledge without character; business without morality; science without humanity; and worship without

asked by leanne on February 24, 2012
63. ## English

Could you please check these sentences, Writeacher? 1) We were in /on a talent show which lot of people watch. We didn't win unfortunately, but it's created a lot of publicity (for us). 2) Since then, we've been writing new songs in the studio and we've

asked by Matthew on April 3, 2012

You are required to research and identify the stakeholders in the 'third runway at Heathrow row'. Your answer should be in the form of a short essay of at least 300 words and should show the interest of the stakeholders. Hint: The government has given the

65. ## US History

If you have a map of 19th century US and the names of the states are changed to Irish names, ie: Irish Sea , Mulligan, etc. And the question was to compare the map to a typical US map, would you answer with just explaining the obvious changes, or is there

asked by lulu on October 30, 2016
66. ## Probability

1) What is the probability of tossing 6 coins and getting at least two tails? 2) Suppose you flip a penny, a nickel,a dime and a quarter. What is the probability of getting heads on the penny and nickel and dime and tails on the quarter? Please show steps

asked by Kevin on June 4, 2010
67. ## math

Michelle had 12 girls and 36 boys show up for field day. She wanted to divide them into groups so that each group had the same number of girls and boys. What is the greatest number of groups that Michelle can make if all of the children are in a group? a.3

asked by Kalyn on January 27, 2016
68. ## physics

Hi! could any help me please, thank you. 1.An object is placed 17.8 cm from a first converging lens of focal length 13 cm. A second converging lens with focal length 24 cm is placed 10 cm to the right of the first converging lens. (Take the direction to

asked by Chan on April 18, 2010
69. ## math - 5th grade

Hello: I am having difficulty witht the following math: Question #1 If the area of a circle is 27 sq. in. What is the radius? I am coming up with an answer of 13.5 sq. in. Is that correct? If not, can you show me step by step how to get the answer?

asked by Sylvie on February 20, 2010
70. ## English - help

Ms. Kemp Recruits Volunteers As a new ninth grader at my high school, I was sitting in an assembly about volunteerism.The guest speaker was Ms. Francis Kemp. Today I had an experience worth writing about. I must admit that I did not have high hopes for the

asked by Cassie on December 17, 2013
71. ## Physics

Given: g=9.81 m/s square. The parachute on a race car that weighs 8042 N opens at the end of a quarter-mile run when the car is traveling 35 m/s. What net retarding force must be supplied by the parachute to stop the car in a distance of 1020 m? Answer in

asked by Jenna on February 25, 2008
72. ## physics

a projectile is ejected from a 25 m high tower with a velocity of 40 m/s at an angle of 30 degrees to the horizontal first on Earth and then on Mars. What is the ratio of the time taken to hit the ground on Mars compared to Earth? (Assume gravity on mars =

asked by kjean on January 27, 2014
73. ## Math

A local Dunkin donuts makes blueberry muffins that cost \$.69 each to make. Past experience shows that 15% of the muffins will spoil and have to be discarded. Assuming this donut shop wants a 30% markup based on cost and produces 200 muffins, each muffin

asked by Liz on January 19, 2012
74. ## Calculus

Hard rubber ball is thrown down from a building with a height of 5 metres. After each bounce, the ball rises to 4/5 of its previous height. Total vertical distance d ball has travelled at the moment it hits the ground for the 8th time, to the nearest 10th

asked by Anonymous on September 18, 2011
75. ## Chemistry

In the reaction between H2O2 and I-, 15 mL of 0.30M KI, 65. mL of 0.10M H2O2 and 19 mL of 0.020M Na2S2O3 were mixed in a flask containing starch and buffer and the total volume was made up to 500mL with distilled water. The solution turned blue (indicating

asked by Nikita on March 22, 2011
76. ## Chemistry

In the equilibrium system CH3COOH(aq) + H2O(l) —> — H3O+ CH3COO-(aq) .

asked by L on January 21, 2018
77. ## lisa

This is a question given to me to answer:How is dividing a polynomial by a binomial similar to or different from the long division you learned in elementary school? Can understanding how to do one kind of division help you with understanding the other

asked by Math on January 21, 2010
78. ## chemistry

1.25 grams of an acidnis completely neutralised by 25ml of a 0.25M Ba(OH)2 SOLUTION.which of the following statements are correct. a)if the acid is dibasic its molar mass would be 200 b)if it is dibasic /0.5g of the acid would neutralise completely 12.5ml

asked by akshita on September 27, 2017
79. ## chemistry

A solution of a substance was spotted at a distance 0.5cm from the base of a 20cm long chromatographic plate.Upon elution,the solvent front got to a place 0.5cm from the top of the plate.If the component moves half way up the 20cm plate,calculate its

asked by Sirneij on April 13, 2015
80. ## Chemistry

what is the Molecular equation for the preparation of tetra-aminocopper(II)sulfate hydrate - Cu(NH3)4SO4*H20 in the experiment CuSO4*5H20 was added to water and then ammonia solution was added to that. and then after that was all stirred up nicely 95%

asked by chris on March 16, 2011
81. ## chemistry

The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.520. If a trial's absorbance is measured to be 0.275 and its initial concentration of SCN– was 0.00060 M, the

asked by david on April 14, 2008
82. ## math Steve helps me

1.64g of a mixture of cac03 and mgc03 was dissolved in 50ml of 0.8 m Hcl. The excess of acid required 16ml of 0.25< NAOH for neutralization. Calculate the percentage of cac03 and mgc03 in the sample The right answer mgc03 52.02% and caco 47.98% You need to

asked by Fai on December 25, 2013
83. ## Intermediate Algebra

A school designer wants to create a whiteboard with the optional dimensions to enhance learning. It is determinedd that if one side of the whiteboard is x+2y inches theother side should be x^2+6xy-5y^2 inches. Write an algebraic expression for the area of

84. ## chemistry

problem 2. a sample of calcium chloride weighs 1.64g. it is dissolved in water and silver nitrate solution added.a precipitate of silver chloride weighing 4.24g was formed.determine the percentage composition of each element. the simple formular of calcium

asked by yankoua on October 28, 2009
85. ## Chemistry

A beaker contains a solution that is 0.50 M in Au+3 ion and 0.25 M in Ag+ ion. A soultion of sodium chloride is slowly dripped into the beaker with stirring. Which ion will precipitate first, the gold or the silver? Clearly support your answer and write

asked by Kelly on November 19, 2014
86. ## chemistry-Buffer Q

You have a solution of .5 L of 1.74g of NH3 and 4.15g of (NH4)2SO4. How many ml of 14M HCl is required for a pH of 9.00? I don't know how to go finish this one. I thought about figuring the concentrations of each (NH3, NH4), making an ice table and solving

asked by matt on November 14, 2011
87. ## Chemistry

A compound of carbon, hydrogen, and oxygen was burned in oxygen, and 2.00g of the compound produced 2.868 g CO2 and 1.567 g H2O. In another experiment, 0.1107 g of the compound was dissolved in 25.0 g of water. This solution had a freezing point of -0.0894

asked by Desz on August 6, 2013
88. ## Physics

Two small stereo speakers A and B that are 1.4 m apart are sending out sound of wavelength 34 cm in all directions and all in phase. A person at point P starts out equidistant from both speakers and walks so that he is always 1.5 m from speaker B. For what

asked by J on April 21, 2008
89. ## Chemistry

Hi can someone please help with this question, or atlest direct me in the right direction. Please and thank you. The initial rate of reaction H2O2(aq) --> H2O (l) + 1/2 O2(g) is found to be1.7*10^-3 M/s . Assume that this rate holds for 2 minutes. Start

asked by Melanie on November 20, 2008
90. ## CHEMISTRY

In a coffee cup calorimeter 70.0 mL of 0.100 M AgNO3 and 70.0 mL of 0.100 M HCl are mixed to yield the following reaction. Ag+(aq) + Cl ‾(aq) → AgCl(s) If the two solutions are initially at 22.60°C, and if the final temperature is 23.39°C, calculate

asked by Sarah on April 30, 2012
91. ## english/vocabulary

Look back at "failing infrastructure" write a letter to your state representative describing an infrastructure problem in your community and urging swift action. thoroughly describe the problem and it's solution, explaining why it is vital to take action

asked by alex on April 15, 2014
92. ## Chemistry

Can someone please help me with this question? Hydrazine is somewhat toxic. Use the half-reactions shown be- low to explain why household bleach (a highly alkaline solution of sodium hypochlorite) should not be mixed with household ammonia or glass

asked by Anonymous on June 7, 2015
93. ## analytical chemistry

a 0.4617g sample containing sodium bicarbonate was dissolved and titrated with standard 0.106M of hydrochloric acid solution , requiring 40.72ml. the reaction is: HCO3- + H+ -> H2O + CO2 Calculate the percent sodium bicarbonate in the sample. (Given

asked by zzz on June 16, 2015
94. ## Chemistry

A solution contains 10.0 g pentane, C5H12, 10.0 g hexane, C6H14 and 10.0 g benzene, C6H6. What is the mole fraction of hexane? I figured the equation would be: ___ M Hexane x 10 Divided by 30 =Mole fraction of Hexane?

asked by Marcus on February 10, 2013
95. ## chemistry

A 50.00ml sample of 0.200M hydroflouric acid (HF) is titrated with 0.200M NaOH. The Pka of HF is 3.452. a) calculate the pH of the HF solution before titration b) calculate the pH after the addition of 20.00ml of NaOH

asked by michelle on November 6, 2010
96. ## chemistry

Write the overall ionic equation and the net ionic equation for the reaction between BaCl2 and Na2SO4 in aqueous solution, indentify the spectator ion and the precipitate ion for this reaction. help :(

asked by Kelly on April 6, 2011
97. ## chem

In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water, the oxidizing agent is____. Is it hydrogen peroxide?

asked by Blair on August 11, 2008
98. ## Chemistry

Given Zn(NO3)2 + (NH4)2S = ZnS + 2NH4NO3 (molar mass of Zn(NO3)2 189 g, molar mass of (NH4)2S 68 g), what is the molarity of a 250 ml solution if you have 123 g of zinc nitrate?

asked by Stephen on March 20, 2013
99. ## Algebra

Use the formula pH = −log[H^+] 9.. The hydrogen ion concentration of a substance is 4.3*10^-6 × moles per liter.Find the pH. Round to the nearest tenth. 10. Find the hydrogen ion concentration of a solution whose pH is 5.3.

asked by john on December 10, 2015
100. ## chem

Calculate the volume of 0.200 M acetic acid and the volume of 0.100 M sodium acetate required to make 200.0 mL of a buffer solution with pH = 5.00. The Ka for acetic acid at 298 K is 2.00 x 10-5.

asked by chem on April 4, 2011