# 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 152
1. ## chem

density of 20% by mass C2H6O2 solution in water is 1.03 g/mL. find the molarity of the solution.

asked by lily on July 21, 2011
2. ## Algebra

Can you please explain this problem to me? Determine whether 30 is a solution of the equation x-13=14. Is 30 a solution? My answer is no. x-13=14 30-13=14 No, not true. Thanks.

asked by B.B. on February 22, 2010
3. ## Chemistry

In the aqueous solution of H2SO4 its mole fraction is 0.2 then closest value of molality or solution is a)13.9 b)9.8 c)10.2 d)11.2

4. ## chemistry

You have a stock solution of 14.0 . How many milliliters of this solution should you dilute to make 1350 of 0.280 ?

asked by Melanie on October 1, 2010
5. ## chemistry

You have a solution of 12.0 M HCl. You need 36.5 g of hydrochloric acid for a reaction in your chemistry lab. How many mL of solution must you use?

asked by Nur on May 8, 2016
6. ## Algebra

Which of the following is a solution of x² + 14x + 112 = 0? If necessary, round to the nearest hundredth. (1 point) • x = –0.24 • x = –4.24 • 4.24 • no solution

asked by Sandra on March 18, 2014
7. ## Chemistry

A solution of volume 70.0mL contains 15.5mmol HCHO2 and 9.00mmol NaCHO2. What is the pH of this solution?

asked by Ryan on March 3, 2009
8. ## chemistry

calculate the molarity of a solution containing 0.5050 mol of solute in 400.0 ml of solution

asked by Anonymous on September 13, 2011
9. ## chemistry

How much of a 0.25 M NaOH solution is needed to neutralize 100 mL of a 0.15 M HCl solution? The units are mL

asked by jazmin on October 3, 2010
10. ## Chemistry

Should 25 ml of 0.15 M HCL solution be added to 250 mL of buffer solution containing 0.25M HF Ka-7.1 x 10, and 0.40 M NaF at a pH of 3.15 what is the new pH?

asked by Always on November 24, 2014
11. ## Chemistry

Calculate molarity of KNO3 solution if 69 g of salt are dissolved into 250 mL of solution

asked by Marissa on March 17, 2016
12. ## chemistry

8.00 of are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?

asked by katy on November 2, 2009
13. ## chemistry

What is the molarity of an HCl solution if 38.5 mL of it is titrated to the equivalence point with 41.6 mL of a 1.41 M NaOH solution?

asked by Megan on January 13, 2013
14. ## Chemistry

A concentrated H2SO4 solution is 10.5 M. You have to make 255 mL of 0.650 M solution. How would you prepare it?

asked by Neishia on November 27, 2015
15. ## chemistry

How would you prepare 385 ml of a 0.856 m NaOH solution starting with a 4.93 m stock solution

asked by Keyera on October 16, 2014
16. ## Chemistry Homework Help

d 25 ml of 0.15 M HCL solution be added to 250 mL of buffer solution containing 0.25M HF Ka-7.1 x 10, and 0.40 M NaF at a pH of 3.15 what is the new pH?

asked by Always on November 24, 2014
17. ## Calculus-HELP!!!

Find the complete general solution and a particular solution that satisfies the initial conditions: 2y'' + y' - 4y = 0 y(0)=0, y'(0)=1

asked by Elyse on July 20, 2013
18. ## chemistry- thank you

How much of a 0.23 M NaOH solution is needed to neutralize 27 mL of a 0.85 M sulfuric acid solution? The units are mL

asked by Jazmin on October 31, 2010
19. ## Chemistry

Why is a NaOH solution disposed differently than a solution composed of Water and Nacl2

asked by Marge on May 6, 2010
20. ## Chemistry

Calculate the molarity of a solution that contains 0.175 mol ZnCl2 in exactly 100 mL of solution.

asked by Thomas on February 26, 2019
21. ## Chemistry pls help!!

A 32mL solution of 2.7M NaCL is mixed with 83mL of 1.8M HCL. What is the molaritt of the CL in the new solution. Thank you for your help

asked by Kate on September 6, 2012
22. ## Honors Chemistry

what volume of solution does a 3.0 molar solution need to have in order to contain 1.8 moles of sodium sulfate?

asked by Erin on April 3, 2013
23. ## Chemistry

When determining the pH of a solution, will the indicator react with and change the properties of the solution. No, not significantly.

asked by KHNJ on February 14, 2007
24. ## science

A startled armadillo leaps upward, rising .544 m in eh first .200s a) What is its initial speed as it leaves the ground? b)What is its speed at the height of .544m? c) How much higher does it go? Solve the first part d= vo*t - 1/2 9.8 t^2 you know d, and

asked by sara on September 17, 2006
25. ## Chemistry

A dilute aqueous solution of an organic compound soluble in water is formed by dissolving 2.35 g of the compound in water to form 0.250 L solution. The resulting solution has an osmotic pressure of 0.605 atm at 25 Celsius. Assuming that the organic

asked by Jeremy on February 6, 2012
26. ## Fractions

Last week, a sporting goods store had a big sale. During the sale, shoppers bought 1/15 of the store's basketballs. After the sale, there were 308 basketballs left. How many basketballs were there originally? Can someone please show me how to solve this

asked by Quinten on November 23, 2014
27. ## chemistry

Got my as chemistry practical next week on OCR. Really stuck on it, don't know how to work out how the expected volume of CO2 is greater than that is obtained. Looked at the mark scheme ocr chemistry evalutative task specimen , but its not much help as it

asked by anonymous on March 31, 2012
28. ## Physics (Heat Engines)

21. A heat engine operates in a cycle between temperatures 700 K and 400 K. The heat input to the engine during each cycle is 2800 J. What is the maximum possible work done by the engine in each cycle? (A) 1200 J (B) 1600 J (C) 2100 J (D) 2800 J (E) 4400 J

asked by Kate on March 6, 2010
29. ## math, HELP ME PLEASE!

A polling company took 5 polls in the week before an election. It showed that a mayoral candidate would get 66%, 56%, 55%, and 63% of the voters. That candidate received 64% of the total votes during the actual election. Find the percent error in the

asked by syram on March 21, 2013
30. ## Hard Pre-Algrebra question

I am having trouble with this question. I have no idea what to do. A miniature box used a scale model of a building of a shape of a right rectangular prism. The prism has edge lengths of 2 1/2 inches, 2 1/8 inches, and 1 inch. How many cubes with side

31. ## Algebra

can you please help me with this problem: 30y2^ + 60y + 300 = 5y2^ + 120y -24 25y - 60y + 324 = 0 used the quadratic equation (used the square root) x = -60 (60)2^ - 4(25)(324) / 50 x = -60 (3600 + 32,400)/50 x = -60 +or minus(-28,800) / 50 x = -60 +

asked by Angela on February 20, 2017
32. ## Math...Applying the Order of Operations

Can you please show me where i'm going wrong? Here's the question: 2(14+35/7) - ((-14 + -35)/-7) A.28 B.31 C.26 D.26 E.38 Here are the rules that apply: Multiplying and Dividing Integers. *If the signs are the same,then give the answer a positive sign. *If

asked by Ryan on February 19, 2009
33. ## accounting

Jones Company had 100 units in beginning inventory at a total cost of \$10,000. The company purchased 200 units at a total cost of \$26,000. At the end of the year, Jones had 80 units in ending inventory. Compute the cost of the ending inventory and the cost

asked by lamyaa on October 19, 2010
34. ## Matt 115

Hello, I just wanted to know if someone could check my work to see if they are right or wrong. Thanks :) 5. Find 2/5 of 4/11. Answer: 8/55 8. Are 3/21 and 3/54 equivalent fractions? Answer: No 14. Write in decimal form 8 583/10,000 Answer: 8.0583 22. Solve

asked by Angela on January 19, 2010
35. ## Algebra

Please check my answer. Solve the system of linear equalities graphically. 3x-y=1 y (0, -6) Equation 1: x-intercept as an ordered pair=> (2,0) Do I have the ordered pairs correct?

asked by Linda on June 4, 2007
36. ## Economics

In a place rice growers burn their field to stabilize their fields the field burning causes pollution, the alternative sanitizing method costs \$150 per acre. Consider a country where rice farmers are willing to pay \$500 per acre for land and corn farmers

asked by eStone on May 5, 2009

Lisa is considering a wireless order-taking system, and she has asked you to do a cost analysis of acquiring it. Consider the following information in your analysis: • The acquisition cost is \$35,000 paid at the time of installation. • It reduces the

asked by victoria on May 29, 2010
38. ## chemistry

A 15.00 mL sample of an unknown monoprotic weak acid solution is titrated with 0.35 M NaOH. The initial buret reading is 0.23 mL. The phenolphthalein indicator turns the solution light pink when the buret reads 29.58 mL. A. what volume of 0.35 M NaOH was

asked by jk on April 1, 2015
39. ## math (patterns)

Heres the problem: Winchester's local toy store sells items according to its own pricing system. A doll costs \$10, a toy train costs \$20, a cradle costs \$20, a jumping jack costs \$30, and a Tickle Me Elmo costs \$50. Using the same system, how much does a

asked by Anonymous on December 10, 2008
40. ## Physics

A speed trap is set up with two pressure-activated strips placed across a highway, 110 m apart. A car is speeding along at 33 m/s, while the speed limit is 21 m/s. At the instant the car activates the first strip, the driver begins slowing down. What

asked by Sara on December 19, 2008
41. ## algebra1

Find the product: (x + 5)2 12 Answer: Referring to the figure, find an expression for the area. 13 Answer: Use the zero-product property to solve the equation: (x + 4)(x - 2) = 0 *NOTE: Applicable to this and all other questions-- For any solution that

asked by peaches williams on June 7, 2011
42. ## math

of the total number of spectators at a circus show, 1/4 are men, 2/5 of the remaining number of spectators are women. there are 132 women at the circus show. how many children are at the circus show?

asked by shohanur on February 21, 2013
43. ## AP CHEMISTRY

A solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution in which the [OH-] is 1.0 x 10^-2 M. Some Fe(OH)2 precipitates. The value of Ksp for Fe(OH)2 = 8.0 x10^-10. A. Assuming that the hydroxide is 1.0 x

asked by DAN on April 11, 2012
44. ## Basic Chemistry (Science)

Determining Chemical Formulas? This was on my test a few days ago for Basic Chemistry, I received 8/20 and I'd really like to see how to work these problems out. *PLEASE SHOW WORK*. Their are four parts to this, If anyone could answer all four with easy

asked by Chris on March 3, 2013
45. ## chemistry

Determining Chemical Formulas? This was on my test a few days ago for Basic Chemistry, I received 8/20 and I'd really like to see how to work these problems out. *PLEASE SHOW WORK*. Their are four parts to this, If anyone could answer all four with easy

asked by Chris on March 2, 2013
46. ## CHEM

What is the major product from an elimination reaction starting with 2-bromo-1-methylcyclohexane? would it be: a) 1-methyl-1-cyclohexene b) a cyclohexane/ene with a double bond off of one C - basically the cyclohexane shape with =CH2 off of it (I don't

asked by k on March 12, 2008
47. ## chemistry

A common laboratory system to study Boyle's law uses a gas trapped in a syringe. The pressure in the system is changed by adding or removing identical weights on the plunger. The original gs volume is 50.0 ml when two weights are present. Predict the new

asked by catherine on March 16, 2010
48. ## physics

TWO BLOCKS a AND b ARE CONNECTED BY A HEAVY ROPE OF MASS 2kg THE MASSES OF a AND b ARE 10 AND 5kg RESPECTIVELY.IF AN UPWARD FORCE OF 200N IS APPLIED TO THE TOP ROPE,THE SYSTEM IS MOVING VERTICALLY UPWARD UNDER GRAVITY A:FIND THE ACCELERATION OF THE SYSTEM

asked by Fonde on January 13, 2012
49. ## Physics- Simple machines

A wheel and axle arrangement has an axle with a diameter of 25cm. A rope is wrapped around the axle and is supporting a load of 2 tonnes. 1) If the mechanical advantage of the system is 30, determine the diameter of the wheel___________m. 2)Determine the

asked by Danny on May 12, 2013
50. ## Math

Meredith's new scale measures in both pounds and kilograms. The information on the box says the scale has a weight limit of 200 kilograms or 440 pounds. Using this information, approximate the unit rates of kilograms per pound and pounds per kilogram, to

asked by Sarah on May 2, 2016
51. ## Chemistry

Can you show me how to do this? 2KClO3 -> 2KCl + 3O2 If 5.0(g) of KClO3 is decomposed , what volume of O2 is produced at STP? 5 g KClO3 = ?? mols. ??mols KClO3 will produce how many mols O2? Use the coefficients in the equation to do this conversion. 1 mol

asked by Tabby on January 10, 2007
52. ## gravitational potential

(1) 2 particles of equal mass are fixed at X=0 and another +ve point on the x axis. No other grav influences are in the system. (they can be ignored) I have to derive an expression for Vgrav at a general position x, on the x axis. I believe this is related

asked by charlie on February 17, 2009
53. ## checking answers 4 algerbra

1. What percent of 120 is 48? 57.6%? 2. collect like terms. 17T + T + 15/13T= 249/13T? 3. solve using the principles together. 3x-6=12 i am solving for x=6? 4. solve using the addition principle. -37+n=19 i am solving for n= -18? 5. solve using the

asked by Nashea on November 8, 2009
54. ## checking answers 4 algerbra

1. What percent of 120 is 48? 57.6%? 2. collect like terms. 17T + T + 15/13T= 249/13T? 3. solve using the principles together. 3x-6=12 i am solving for x=6? 4. solve using the addition principle. -37+n=19 i am solving for n= -18? 5. solve using the

asked by Nashea on November 8, 2009
55. ## Chemistry

"A 25.0% solution of Al2(SO4)3 has a density of 1.75 g/ml. What is the mass of dissolved solute in 40.0 ml of solution?" How would one set this problem up?

asked by Kathryn on December 8, 2010
56. ## Chemistry

calculate the volume of the 3.0 M stock solution needed to make a diluted 30mM solution in 400ml

asked by Jennifer on May 29, 2013
57. ## chemistry

a saturated NH4Cl aqueous solution is prepared in 100g oh water t 25 celsius. how much solute is in solution.

asked by Mia on December 2, 2015
58. ## chemistry

If you make a solution by dissolving 25.0g of sodium chloride in 100.0 mL of water. What is the boiling point of the solution?

asked by confused on December 13, 2011
59. ## chemistry

A solution of acid was found to have a pH of 1.60. What is the hydrogen ion concentration of the solution? (3 sig.fig) [H+(aq)] = ? mol dm–3

asked by James Holland on January 8, 2011
60. ## Chemistry

If 0.0365 mol of CaCl2 is dissolved in water to make a 0.640 M solution, what is the volume of the solution?

asked by Tsomo on October 5, 2016
61. ## Chemistry

you make a solution by dissolving 25.0g of sodium chloride in 100.0 mL of water. What is the boiling point of the solution?

asked by akboyer31 on April 22, 2012
62. ## Chemistry

What volume of a 0.5 M solution is required to prepare 250 mL of a 0.15M solution? (Note: M = mole per Litre)

asked by Helen on November 7, 2012
63. ## chemistry

What is the osmotic pressure of a solution prepared by dissolving 5.50 g of CaCl2 in enough water to make 420. mL of solution at 29.2°C?

asked by lily on May 28, 2019
64. ## chemistry

How many grams of I2 are present in a solution if 33.75mL of 0.140M Na2S2O3 solution is needed to titrate the I2solution?

asked by Ellen on November 18, 2013
65. ## chemistry

If you mixed equal volume of .1 M HCl and .20 M Tris (pka=8.3), IS THE RESULTING SOLUTION A BUFFER SOLUTION? Why? or Why not?

asked by nicki on September 18, 2010
66. ## Chemistry

If you take a 10.0-{mL} portion of the stock solution and dilute it to a total volume of 0.700 L, what will be the concentration of the final solution?

asked by Veronica on October 7, 2010
67. ## chemistry

What is the pH of a solution in which 378 mL of HCL, measured at 27.5 degrees celcius and 1.02 atm, is dissolved in 1.5 mL of aqueous solution?

asked by Anonymous on December 4, 2011
68. ## biology

Suppose that the concentration of H+ in solution #1 is 10,000 times greater than the solution #2. What can you conclude about the difference in pH of these two solutions?

asked by mary on February 25, 2011
69. ## Chemistry- acids/bases

Find the concentration of OH- of a solution of 45.0mL of 0.0921 M Ba(OH)2 diluted with enough water to make 350.0 mL of solution.

asked by Jessica on February 12, 2014
70. ## chemistry

calculate the molarity of a solution prepared by dissolving 5g of sodium hydroxide in water to make 1l of solution

71. ## chemistry

What is the osmotic pressure of a solution prepared by dissolving 5.80 g of CaCl2 in enough water to make 450. mL of solution at 24.7°C?

asked by kale on May 28, 2019
72. ## Chemistry

If 1.70 liters of 0.670 M CuSO4 solution is electrolyzed by passing 4.70 amps through the solution for 3.00 hr using inert electrodes.

asked by Dana on November 19, 2010
73. ## chemistry

how many grams of Ag2CO3 will precipitate when excess Na2CO3 solution is added to 64.0 mL of 0.554 M AgNO3 solution?

asked by mya on March 23, 2013
74. ## AP CHEMISTRY

Sufficient strong acid is added to a solution containing Na2HPO4 to neutralize one-half of it. what will be the pH of this solution? Explain please

asked by ERAGON on February 15, 2012
75. ## AP CHEMISTRY

Sufficient strong acid is added to a solution containing Na2HPO4 to neutralize one-half of it. what will be the pH of this solution? Explain please

asked by ERAGON on February 15, 2012
76. ## Organic Chemistry

Calculate the volume of a 0.200 solution that will completely neutralize 40.0 of a 0.264 solution. Where do I begin with this problem?

asked by LaRema on April 30, 2012
77. ## Chm

What is the molarity of a saturated solution of potassium sulfate if the solubility is 13 g per 100 g H2O at 25°C? The density of the solution is 1.1 g/mL

asked by Chris on January 17, 2013
78. ## chemistry

calculate the molality of one molarity solution of sodium nitrare. the density of solution is 1.25g cm cube.

asked by joyti on June 20, 2011
79. ## Chemistry

What is the molarity of a solution made by dissolving 10 grams of CaBr2 in enough water to make 400 mL of solution?

asked by Brea on June 20, 2011
80. ## chemistry

You dissolved 14.08 g of CuCl2 (MM = 135 g/mole) in enough water to make 266 mL of solution. The concentration of this solution is:

asked by Anonymous on December 5, 2011
81. ## Chemistry

how would a dilution be performed, starting with a concentration .50 M Cacl2 solution, to obtain 250ml of a .060M solution?

asked by Jessica on January 29, 2013
82. ## Chemistry

calculate the volume of the 3.0 M stock solution needed to make a diluted 30mM solution in 400ml

asked by Jennifer on May 29, 2013
83. ## Chemistry

what is the pH of a 0.025 M aqueous solution of sodium propionate, NaC3H5O2? What is the concentration of propionic acid in the solution?

asked by Henry on August 8, 2011
84. ## Chemistry- acids/bases

Find the concentration of OH- of a solution of 45.0mL of 0.0921 M Ba(OH)2 diluted with enough water to make 350.0 mL of solution.

asked by Jessica on February 12, 2014
85. ## chemistry

Does the solution's acidity increase or decrease as potassium hydroxide is added to the solution? Explain your answer.

asked by Tasha on March 27, 2011
86. ## chemistry

Find the percent by mass of sodium chloride in a 1.35 M NaCl solution. The density of the solution is 1.06 g/mL..............how do I go about doing this question thanks!

asked by Stacy on December 4, 2010
87. ## chemistry

If a solution is made 0.080 M in Mg(NO3)2, 0.075 M in aqueous ammonia, and 3.5 M in NH4NO3, will Mg(OH)2 precipitate? What is the pH of this solution?

asked by Anonymous on April 3, 2015
88. ## Biochemistry

what will be the pH of a buffer prepared by mixing 600 ml of 0.1M sodium acetate solution and 40 ml of 0.2M acetic acid solution

asked by Lisa on May 25, 2011
89. ## Biochemistry

What is the pH of the resulting solution if 10.0 mL of 1.0 M NaOH is added to 100 mL of this formic acid - sodium formate solution?

asked by Nik on June 27, 2016
90. ## chemistry

A solution is prepared by dissolving 17.1grams of sucrose, c12h22o11, in 275grams of h20. what is the molality of that solution? how would i do this???

asked by Miley on April 5, 2008
91. ## chemistry

10 mL of 0.0100 M HCl are added to 25.0 mL of a buffer solution that is 0.010 M HC2H3O2 and 0.1 M C2H3O2-. What is the pH of the resulting solution?

asked by Renata on June 5, 2015
92. ## Chemistry

how would a dilution be performed, starting with a concentration .50 M Cacl2 solution, to obtain 250ml of a .060M solution?

asked by Jessica on January 29, 2013
93. ## chemistry

calculate the molality of one molarity solution of sodium nitrare. the density of solution is 1.25g cm cube.

asked by joyti on June 20, 2011
94. ## chemistry

8.00g of NaOH are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?

asked by katy on November 2, 2009
95. ## chemistry

The density of a 2.45 M aqueous methanol solution is .976 g/ml. what is the mass of water present in 1.00 liter of this solution

asked by kyle on October 4, 2011
96. ## Chemistry

If 1.0 mL of 6.0M HCl is added to 499 mL of water to give exactly a 500 mL solution, what is the molarity of the dilute solution?

asked by Amy on May 6, 2012
97. ## Chemistry

Calculate the concentration of OH− and the pH value of an aqueous solution in which [H3O+ ] is 0.014 M at 25°C. Is this solution acidic, basic or neutral?

asked by Jennie on March 12, 2015
98. ## chemistry

You have 95.0 mL of a 2.50 M solution of Na2CrO4(aq). You also have 125 mL of a 2.50 M solution of AgNO3(aq). Calculate the concentration of Na+ after the two solutions are mixed together. 1.08 M 0.475 M 5.00 M 0.00 M 2.16 M

asked by Ha on May 13, 2016
99. ## Chemistry

One liter of Saline solution is prepared by dissolving 25.0 g NaCl in water. Find the molarity of this solution.

asked by Kristen on February 20, 2012
100. ## Chemistry

4.54 g of hydrazoic acid ( HN3 ) is added to water to make a final solution of 504 ml. What is the pH of the solution ? Use Ka = 1.90 × 10−5

asked by Chelsea on March 8, 2010