# 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

91,718 questions, page 204
1. ## physics

A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.35 cm. If the spring constant is 222 N/m and the mass is 0.580 kg, determine the mechanical energy of the system. Determine the maximum speed of the mass. Determine

asked by Anonymous on April 7, 2016
2. ## Math - Algebra 2

In a certain math class, each student has a text book, every 2 students share a book of tables, every 3 students share a problem book, and every 4 students share a mathematics dictionary. If the total number of books is 75.. how many students are in a

asked by AS on December 2, 2006
3. ## algebra

Jared can work 54 math problems in one hour, how many problems can he work in ten minutes

asked by roxanna on August 15, 2013
4. ## FRENCH WORK ASAP

please please someone check my work I don't understand it fully so I am asking if someone could please check my work thank you if it's too much I'm sorry. God Bless

asked by Hellokitty1993 on January 21, 2009
5. ## science

Need to prepare a lab that requires 1000ml of 1.0M HCl. You find some 3 M HCl to work with. What do you need and how would you work it out?

asked by clair on February 17, 2011
6. ## Math

I don't understand this it says If the average of 6 numbers was 58, what could the 6 numbers be? That would take forever to work out. What is the easiest way to work that out

asked by Sarah on July 24, 2012
7. ## HIT 105 research paper

I am doing a paper on HIPAA and I need to cite my work. Have the paper finished but I am having problems citing my work. Could someone help me please?

asked by Theresa on November 1, 2010
8. ## Physics

The work W0 accelerates a car from 0 to 20 km/h. How much work (in terms of W0) is required to accelerate the car from 20 km/h to 100 km/h?

asked by Caleb on December 29, 2014
9. ## fhjgf

Omar made 378 for 78 hours of work at the same rate how much would he make for 12 hours of work?

asked by gjfj on April 17, 2012
10. ## Chemistry

Given the balanced equation : 3 CO + 7 H2 -> C3H8 + 3 H2O How much C3H8 will be produced if 45.8 g CO reacts with 87.3 H2 ? Please all your work (i did it but im not sure if i did all the work right)

asked by Dilcia on July 28, 2015
11. ## English

Thank you very much. Here is the second part. Some data are unclear. I hope you can help me. 1) “Focus group” led by the school principal made up of the participating students (or the students involved in the project), the contact person (also:

asked by Henry2 on February 4, 2012
12. ## Psychology

Choose 5 activities you do daily and indicate whether the activity uses your sympathetic or parasympathetic nervous system. 3 of my daily activities are reading, walking, and writing. I need help thinking of 2 more. Also- How do I determine if the activity

asked by Gabby on October 23, 2007
13. ## More spots

Question: A colorless unknown substance is spotted on a TLC plate and developed in the correct solvent. The spots do not appear when visualization with a UV lamp or iodine vapors is attempted. What could you do to visualize the spots if the compound is the

asked by Sheryl on October 15, 2006

The motion of a spring that is subject to dampening (such as a car's shock absorber)is often modeled by the product of an exponential function and a sine or cosine function. Suppose the equation of motion for a point on such a spring is

asked by Emma on June 24, 2013
15. ## Philosophy

Can someone please check my answers if it is right. Thank you! True/False 1. Rosenstand argues that moral subjectivism is an intuitively sound, "live and let live" kind of moral position that is both appealing and socially cohesive. -FALSE 2. For the

asked by ivy on July 11, 2014
16. ## Chemistry

Question: a 25.00 mL. aliquot of a solution containing TI(aq) was treated with K2CrO4. the TI2CrO4 was filtered, washed free of excess precipitation reagent, and dissolved in dilute sulfuric acid. the dichromate ion produced was titrated with 40.60 mL. of

asked by Anonymous on May 6, 2009
17. ## chem

Calculate [H3O] in the following solutions. 5.15x10-2M HCl and 7.62x10-2M NaC2H3O2 Responses HCl + NaC2H3O2. It appears there is an excess of H^+ which will react with NaC2H3O2 to form HC2H3O2. That gives you a buffer of C2H3O2 and HC2H3O2 and you use the

asked by tomi on April 16, 2009
18. ## Math

1. Find the next number in the pattern. -1, 3, 7, 11 a. 16 b.77 c.15

asked by Zoe Mckenzie on December 2, 2015
19. ## statistics

You are ordering a new home theater system that consists of a TV, surround sound system, and DVD player. You can choose from 1616 different TVs, 2222 types of surround sound systems, and 1919 types of DVD players. How many different home theater systems

asked by Hallie on July 25, 2017
20. ## math- help again please

An employee earns \$7.00 and hour for the first 35 hours worked in a week, and \$10.50 for any hours over 35. One paycheck (before deductions) was for \$308.00.How many hours did the employee work? Let t denote the overtime hours. Then you know that if the

21. ## Chemistry

A 5.00 mL sample of an aqueous solution of H3PO4 requires 43.2mL of 0.285M NaOH to convert all of the H3PO4 to Na2HPO4. The other product of the reaction is water. Calculate the molarity of the H3PO4 solution.

asked by Duke on October 26, 2014
22. ## Chemistry

when 7.50 grams of iodine (I2) is added to 48.7grams of carbon tetrachloride (CCl4), the iodine dissolves and a solution is formed. The weight percent of the iodine in the solution is? 7.50g I2/ 7.50 + 48.7 X 100 = 13.3 Did I do this correctly?

asked by Hannah on February 11, 2012
23. ## Chemistry

A solution is prepared that contains 0.0200 M AgNO# and 0.150 M KSCN. What is the equilibrium concentration of Ag+ ion in this solution? The Kf for Ag(SCN)4^3+ is 1.21x10^10 I'm not even sure how to set up this problem? Would I need to do an ice box?

asked by nns40760 on November 29, 2014
24. ## chemistry

A solution is made by dissolving 811.0 cg of barium hydroxide, Ba(OH)2, in 0.1137 kg of water. What is the concentration in parts per million? I know the equation is: ppm= (mass of solute/mass of solution)10^6 Does the mass need to be in g or kg?

asked by erica on May 11, 2014
25. ## English

Please kindly check my english grammar below: Dear Sir, My late attendance at work was due to the transportation were leaving at our accommodation at 8:30 am and our duty time would start at 9:00 am the distance going to work would be imposssible to reach

asked by jesie on December 5, 2018
26. ## math/algebra

Division: x^2 + 2x - 15over 4x^2 divided by x^2 -25 over 2x-10 Will someone show me the steps to work this problem, I have looked and looked at my book but it still makes no sense to me. Help. First, change the division to the reciprocal of muliplication.

asked by dee on August 19, 2007
27. ## Genetics

Suppose a dominant gene for a particular disease is found on the X chromosome and is denoted as X^D. The mother is X^D X^D and the father is XY. What percent of the couple's children will show the disease? I understand how it works if the X^D gene was

asked by Sydney on April 27, 2016
28. ## Physics

A car travels in a straight line with an average velocity of 80 km/hr for 2.5 hours and then with an average velocity of 40 km/hr for 1.5 hours. a. Calculate the largest displacement for the 4-hour trip. b. Calculate the largest average velocity for the

asked by K on August 28, 2013
29. ## physics

A worker in a warehouse uses a rope passing through some pulleys to lift a heavy crate. The worker exerts a force five times less than the weight of the crate but has to move the rope four times as far as the crate moves. This situation... A) can happen

asked by Belinda on July 5, 2014
30. ## Chemistry

You have a reaction using the following criteria: 1.3456 g of barium chloride solution (0.786M) is mixed with 1.20089 g of sodium sulfate solution (1.3M). The ambient pressure is 754.564 mmHg and the temperature is 56.889 degrees celsius. Determine the

asked by Katie on April 26, 2011
31. ## science

50 ml of ZnSO4 solution was transferred to a mercury cathode and enough solid potassium nitrate is added to make the solution 0.1 M in KNO3. The electrolysis of Zn2+ is carried to completion of -1.3 V vs. SCE with the passage of 241 C of electricity.

asked by Maya on November 5, 2012
32. ## science

50 ml of ZnSO4 solution was transferred to a mercury cathode and enough solid potassium nitrate is added to make the solution 0.1 M in KNO3. The electrolysis of Zn2+ is carried to completion of -1.3 V vs. SCE with the passage of 241 C of electricity.

asked by Maya on November 5, 2012

The number of pounds of apples a cannery can produce and the processing cost are P(h) = 375h and C(n) = 0.35n + 1000 where P(h) is the number of pounds of apples that can be processed in h hours and C(n) is the cost of processing n pounds of apples. Use

asked by Lily on October 5, 2017
34. ## Math

A vehicle starts w/ a full tank of gasoline and travels 150 miles. While refilling the tank, the driver notes that the vehicle used (1/4) tank of gasoline in traveling the 150 miles. Assuming the vehicle averages 25 miles per gallon, approximately how many

asked by Helen on April 21, 2009
35. ## Math

Need help solving this problem please. Andrei buys a painting and sells it to Boris Andrei makes a 60% profit on the sale Boris sells the painting to Clarissa Clarissa pays 1.5times the price that andrei paid for the painting Boris made a loss What is his

asked by Maggie on June 23, 2008
36. ## Chem

This is the problem: In a 1-L beaker, 203 ml of 0.307 M ammonium chromate was mixed with 137 ml of 0.269 M chromium (III) nitrite to produce ammonium nitrite and chromium (III) chromate. Write the balanced chemical reaction occuring here. If the percent

asked by Anonymous on October 30, 2006
37. ## Math

Two six-sided dice are rolled at the same time and the numbers showing are observed. Find the following. a. P(sum=6) (1,6), (6,1) 1/36+1/36=2/36 b. P(sum=3) =1/36 c. P(sum is an odd number) 30/36 d. P(the two dice show same numbers) ? Can you check my

asked by Keonn'a on October 9, 2018
38. ## physics

A disk with mass m = 5.2 kg and radius R = 0.44 m hangs from a rope attached to the ceiling. The disk spins on its axis at a distance r = 1.59 m from the rope and at a frequency f = 18.6 rev/s (with a direction shown by the arrow). 1. What is the magnitude

asked by stewart on November 24, 2014
39. ## Chemistry URGENT

I have to match the items to the statements below, and I'm stuck! My answers are in parentheses, but I know that some of them are wrong. Please help if you know how...I would GREATLY appreciate it! A Dilute B Unsaturated C Saturated D Supersaturated 1.

asked by Lindsay on April 24, 2007
40. ## Physics

What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 186 km? What is the period of revolution? So GMm/r^2 = mv^2/r and I know that I need to solve for v but what do I use for the mass of the satellite? Do I just plug

asked by winterWX on February 16, 2007
41. ## physics

consider three charges: +Q, -Q, q where the center charge is equidistnat from the other two. assum that the two Qs cannot move. you also want to charge q to be at rest. if q=-8.0 nC, find Q+ You don't have to solve it but can you lead me in the right

asked by jen on January 15, 2009
42. ## Finance

how do solve a math question that states an employee has an annual salary of 26,965. after he arranges to have deducted from his salary 12% for the purchase of bonds, 17% for federal withholding tax, and 3% for a retirement fund, how do you solve this

asked by Queen on October 7, 2011
43. ## chem- acids and bases

sorry to take up your time again, acids and bases just really confuse me, i'd really appreciate your help again. "What is the pH at the end point for the titration of 0.20M HNO2 by 0.20M NaOH? Ka nitrous acid= 4.5 x 10^-4." this is what i do know: - end

asked by marie on April 16, 2011
44. ## HUM/205

To what human experience does the work relate? O How is that human experience meaningful to your life? O How does the work express or relate to your human experience? O What social, cultural, and moral values does the work express

asked by Suny on April 24, 2010
45. ## AP Chem

An aqueous solution contains 4.50 g of calcium chloride, CaCl2, per liter. What is the molarity of CaCl2? When calcium chloride dissolves in water, the calcium ions, Ca^+2, and chloride ions, Cl^-, in the crystal go into the solution. What is the molar

asked by Anna on November 3, 2008
46. ## Chemistry

"A voltaic cell is constructed by immersing a strip of sillver metal in a 1.0 MAgNO3 solution and a strip of cadmium metal in a 1.0M Cd(NO3)2 solution. The circuit is completed by a wire and a salt bridge in the usual way. a. Write the balanced overall

asked by todd on March 10, 2011
47. ## Math

I posted this question earlier: a.) Maddie works at a desighner store. She earns \$1925 per month plus 10% commission of her sales. Write an equation to show how much she makes b.) one month she earned \$2725. Use your equation to show what her sales were

asked by Olly on May 11, 2013
48. ## math

A total of 129 players entered a single elimination handball tournament. In the first round of play, the top seeded player received a bye and the remaining 128 players played in 64 matches. Thus 65 players entered the second round of play. How many matches

asked by austin on May 10, 2010
49. ## math

A total of 129 players entered a single-elimination hand ball tournament. In the first round of play, the top-seeded player received a bye and the remaining 128 players played in 64 matches. Thus, 65 players entered the second round of play. How many

asked by Kristi on May 9, 2010

What are some elements to a good appraisal system? Thank you for using the Jiskha Homework Help Forum. You do not state if you need this appraisal system in hiring or in evaluating an employee. Here are some links for you: 1. (Broken Link Removed) 2.

asked by Marie on June 18, 2007
51. ## Physics! HElp

A g ice cube at -15.0oC is placed in g of water at 48.0oC. Find the final temperature of the system when equilibrium is reached. Ignore the heat capacity of the container and assume this is in a calorimeter, i.e. the system is thermally insulated from the

asked by Idali on April 11, 2017
52. ## Physics

I did the problem but i'm confused on what to do next: 1.A hunter aims directly at a target (on the same level) 120m away. (a) If the bullet leaves the gun at a speed of 250m/s, by how much will it miss the target? (b) At what angle should the gun be aimed

asked by LINA on January 18, 2016
53. ## Physics

Help with Physics homework Please and thank you!? I need help on these two questions. I'm not looking for the answer because I really need to learn how to do this on my own. But if someone could show me what equations to use to answer the steps in the

asked by Meagan on May 20, 2014
54. ## Chemistry

What is the molarity of the resulting saline solution when you mix 1 mole HCl with 1 mole NaOH? I'll provide some basic information that I know, but could somebody tell me how to get the answer using the data? The balanced reaction is as follows:

asked by Andrew on March 8, 2008
55. ## social studies

Which document establishes the separation of powers? a. the Bill of Rights b. the Articles of Confederation c. the Declaration of Independence d. the Constitution *** In what way did the structure of the Virginia House of Burgesses influence the

asked by LAFAYETTE on December 12, 2016
56. ## Physics

Any ideal gas temperature may be written as T = Ti*r where Ti=temp at ice point and r = lim(P/Pi) at constant V. Show that the fractional error in T is dT/T = dr/r + 3.73 drs/rs where r s = lim(Ps/Pi) at constant V. Ps is pressure at steam and Pi is

asked by Jane on February 3, 2010
57. ## Math 1 question

a.) Maddie works at a desighner store. She earns \$1925 per month plus 10% commission of her sales. Write an equation to show how much she makes b.) one month she earned \$2725. Use your equation to show what her sales were that month Please help, thanks :)

asked by Olly on May 11, 2013
58. ## Math - Equation of Lines

Determine whether the following pairs of planes are coincident, parallel and distinct or neither. a) x + 3y - z - 2 = 0 and 2x + 6y - 2z - 8 = 0 TEXTBOOK ANSWER: parallel and distinct Can someone show me how to find the vector equation or parametric

asked by Anonymous on March 25, 2008
59. ## English Q#2

"Though I do hate him as I do hell-pains, Yet, for necessity of present life, I must show out a flag and sign of love, Which is indeed but sign." i don't know what this quote means this is what i think: "even though i hate him but for now i will show my

asked by NeedHelp on November 19, 2010
60. ## Chemistry

How many half-lives have passed if 87.5% of a substance has decomposed? How many if 99.999% has decomposed? For 87.5% decomposition 1/8 is left. (1/8) = (1/2)^3 Three half lives is the answer Fot 99.999% decomposition, 10^-5 is left. Solve 10^-5 = (1/2)^n

asked by John on November 25, 2006
61. ## math

If A^TA is an invertible matrix, prove that the column vectors of A are linearly independent. You know that if statement X implies statement Y then that is equivalent to Not(Y) implies Not(X). You can start by taking the column vectors of to be linearly

asked by mathstudent on January 8, 2007
62. ## social studies

How has the elimination of trade barriers affected the movement of goods among member countries of the European Union? A. Member countries are able to produce all the goods they need. B. Goods can move freely among member countries. C. Member countries no

asked by Kciity on May 13, 2019
63. ## CHEMISTRY

I am having a ton of trouble with this lab question, I do not understand it at all. The question is: Show how the rate of reaction in reciprocal seconds was calculated for the mixture in question 1, using the class average. The mixture in question one is:

asked by blue fire on November 21, 2010
64. ## chemistry

I am having a ton of trouble with this lab question, I do not understand it at all. The question is: Show how the rate of reaction in reciprocal seconds was calculated for the mixture in question 1, using the class average. The mixture in question one is:

asked by blue fire on November 21, 2010
65. ## Physics

Two equal-volume compartments of a box are joined by a thin wall as shown in the figure. The left compartment is filled with 0.050 mole of helium gas at 403 K, and the right compartment contains 0.025 mole of helium gas at 213 K. The right compartment also

asked by Lyra on February 3, 2014
66. ## college chemistry

what is the molarity of NaF in the final solution if a solution was prepared by mixing 35.0mL of 0.200M NaF with 28.5mL of 0.350M NaF

asked by S.Dunn on November 9, 2011
67. ## Chemistry

For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution? Thank you for the help!!

asked by Homework help on October 20, 2013
68. ## Chemistry

10.0g of sodium chloride is dissoved in 300ml of 0.75mol/L magnesium chloride solution. Find the new concentration of chloride ions f the solution.

asked by Emilee on December 13, 2012
69. ## Chemistry

For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?

asked by D.C. on October 20, 2013
70. ## chemistry

340. mL of hydrochloric acid (HCl) acid is exactly neutralized with 500. mL 0.700 M NaOH solution. What is the concentration of the acid solution?

asked by Anonymous on June 1, 2014
71. ## CHEMISTRY!!

For the diprotic weak acid H2A, Ka1 = 2.0 × 10^-6 and Ka2 = 6.7 × 10^-9. What is the pH of a 0.0800 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?

asked by GARRETT on November 2, 2015
72. ## Chemistry!

determine the new molarity of calcium ions when 50.0 mL of a 1.50 M calcium chloride solution are combined with 750.0 mL of a 0.236 M calcium phosphate solution.

73. ## Chemistry

For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?

asked by D.C. on October 20, 2013
74. ## chem 111

What is the molarity of a solution of 10.0% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 g/mol) by mass? The density of the solution is 1.10 g/mL.

asked by jojo on August 26, 2008

Mary has a solution that is 60% alcohol and another that is 20% alcohol. How much of each should she use to make 100 milliliters of a solution that is 52% alcohol. I totally forget how to do this kind of problem. Please help if you can! Thank you so much!

asked by Faith on May 29, 2009
76. ## math

1. give an example of an absolute value inequality whose solution set is the empty set 2. explain why \x+2\ is greater than or = to -4 has all real numbers as its solution set.

asked by Michelle on September 16, 2008
77. ## Chemistry

For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution? Thank you for the help!!

asked by Homework help on October 20, 2013
78. ## chemistry

For the diprotic weak acid H2A, Ka1 = 2.8 × 10-6 and Ka2 = 5.8 × 10-9. What is the pH of a 0.0700 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?

asked by ggigignune on September 19, 2018
79. ## Chemistry

10.0g of sodium chloride is dissoved in 300ml of 0.75mol/L magnesium chloride solution. Find the new concentration of chloride ions f the solution.

asked by Emilee on December 13, 2012
80. ## chemistry

What is the molarity of a solution of 10% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 g/mol) by mass? The density of the solution is 1.10 g/mL.

asked by thanh on March 14, 2008
81. ## math

1. give an example of an absolute value inequality whose solution set is the empty set 2. explain why \x+2\ is greater than or = to -4 has all real numbers as its solution set. please help

asked by Michelle on September 16, 2008
82. ## Chemistry

For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution? Thank you for the help!!

asked by D.C. on October 20, 2013
83. ## chemistry

A hexane solution contains as impurities 5.2% (by mass) hepatne and 2.9% (by mass) pentane. Calculate the mass of each component present in 93g of the solution.

asked by Pat on April 17, 2011
84. ## Chemistry

For the diprotic weak acid H2A, Ka1 = 2.2 × 10-5 M and Ka2 = 7.8 × 10-7 M. What is the pH of a 0.0650 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?

asked by D.C. on October 20, 2013
85. ## Quanitive Methods

A car rental company has \$540,000 to purchase up to 25 new cars of two different models. One model costs \$18,000 each and the other model costs \$24,000 each. Write a system of linear inequalities to describe the situation. Let x represent the first model

asked by Tam on October 1, 2007
86. ## Algebra

You go to the doctor and he gives you 13 milligrams of radioactive dye. After 20 minutes, 4.5 milligrams of dye remain in your system. To leave the doctor's office, you must pass through a radiation detector without sounding the alarm. If the detector will

asked by Marina on September 24, 2015
87. ## Math

I have two problemson polygonal convex sets which I do not understand. The first: Find the minimum value of f(x,y) = 2x-y+2 for the polygonal convex set determined by this system of inequalities: x is more than or equal to 1 x is less than or equal to 3 y

asked by Joanie on January 20, 2009
88. ## Research and Evaluation

1) A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean. 2) The Fox TV network is considering replacing one of its

asked by David M. on December 26, 2011
89. ## Statistics

1) A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean. 2) The Fox TV network is considering replacing one of its

asked by McKenzie on July 11, 2012
90. ## chemistry

An equilibrium mixture contains N2O4, (P= 0.30 ) and NO2 (P= 1.1 ) at 350 K. The volume of the container is doubled at constant temperature. Calculate the equilibrium pressure of when the system reaches a new equilibrium. Calculate the equilibrium pressure

asked by Anonymous on May 20, 2010
91. ## math

hi, i have an assignment of math to be done in microsoft equation editor, but i don't know how to use this program, do u know how or a site that can teach me, because i have looked in many sites but it doesnt really show me much. i would appresiate any

asked by Haydee on September 4, 2006
92. ## Chemistry

A gas storage tank has a volume of 350,000 when the temperature is 27 degrees celcius and the pressure is 101 kPa. what is the new volume of the tank if the temperature drops -10 degrees celcius and the pressure drops to 95 kPa? please show work.

asked by Bob on February 22, 2010
93. ## math

Roberto's scout troop is making some birdhouses for the park district. The basic birdhouse uses one half-sheet of plywood and the deluxe bridhouse uses three half-sheets of plywood. They plan to build a total of 24 birdhouses, and the scoutmaster has 40

asked by Dezy on January 26, 2010
94. ## Chemistry

The reaction of NO and O2 produces NO2. 2 NO(g) + O2(g) „_ 2 NO2(g) The reaction is second-order with respect to NO(g) and first-order with respect to O2(g). At a given temperature, the rate constant, k, equals 4.7 x 10^2 M^¡V2s^¡V1. What is the rate

asked by Whitney on February 18, 2015
95. ## physics

A 80 kg object slides at a 20 degree plane downward at 5m/s. An object 2 collides with object 1 by falling from 7 meter height and they stick together. Final speed of objects? I know the speeds would be the same. Would momentum equation work to solve this?

asked by Laura on October 25, 2012

1. Suppose the height, h, in feet, of a trampolinist above the ground during one bounce is modelled by the quadratic function h(t) = -16t2 + 42t + 3.75 . For what period of time is the trampolinist at least 22 ft above the ground? Round your answers to the

asked by Ashley on June 18, 2015
97. ## chemistry

0.049M solution of NaOH was used to standerize a solution of HCl. 20 ml of aliquot of sodium carbonate was placed was placed in a conical flask and titrated with HCl from a buret . the correct indicator for this reaction would be one of the changes colour

asked by raja on November 2, 2016
98. ## Chemistry

5.30g of pure anhydrous sodium carbonate, na2co3 was weighed and dissolved in a 250cm³ standard flask.The solution was made up to the etched mark with distilled water, calculate the number of moles of na2co3 in the solution.

asked by Bello on January 22, 2018
99. ## organic chemistry

a compound you have prepared is reported in the literature to have a pale yellow color. when the substance is dissolved in hot solvent to purify by crystallization, the resulting solution is yellow. explain if you should us decolorizing charcoal before

asked by mekonen on August 25, 2008
100. ## Chemistry

A 500.0-mL sodium iodide (NaI) solution was prepared by dissolving 37.7g of solid NaI in water. Chlorine gas was bubbled through a 100.0-mL sample of this solution until the reaction was complete. How many grams of molecular iodine were produced?

asked by L on November 6, 2009