# 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 188
1. ## Chemistry

A watch is to be electroplated with gold. - provide a solution that would make a suitable electrolyte for this cell. I'm not quite sure how to figure out what the electrolyte solution is made of. Any help you can give me would be wonderful!

asked by Hannah on September 10, 2012
2. ## Chemistry

What will the molarity be if 12 drops of the blue dye solution is mixed with enough water to make one liter of solution (assume that 20 drops is equivalent to 1mL) Im not sure where to start?

asked by Kristen on March 1, 2012
3. ## CHEMISTRY

You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l.

asked by Jason on January 9, 2017
4. ## chemistry

3. If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity of the solution? [Use molecular weight: HCl, 36.46 amu] 5.20/36.46= 0.1426 X 3.00=0.428 M IS THIS CORRECT

asked by Anonymous on November 8, 2014
5. ## Chemistry

In an acid-base neutralization reaction 28.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution. What is the concentration of the H2SO4 solution? Please help with this question, thank you.

asked by Trever on September 19, 2010
6. ## Math/dilution

A powder concentrate contains 2% w/w of active ingredient. What would be the percentage concentration (w/v) of the resultant solution after a 5-g packet of powder is dissolved in enough water to make 1 quart of solution?

asked by Anonymous on May 20, 2016
7. ## Chemistry

Thanks in advance. A student prepared a solution of NaCl by dissolving 55.0 grams of sodium chloride in 570 mL of water. What is the percent by mass of the NaCl solution?

asked by Dalal on February 13, 2018
8. ## Chemistry

Assuming the sample is pure sodium sulfate, how many mL of 5% BaCl2.2H20 solution would be required to precipitate the sulfate. Density of barium shloride solution of 1.00 g/mL.

asked by Mika on October 8, 2011
9. ## Math

I need help atleast an equation to get started please A lab assisstant wants to make five liters of 27.8% acid solution. If solutions of 50% and 13% are in stock, how many liters of each must be mixed to prepare the solution.

asked by Janine on May 12, 2012
10. ## chemistry

Rachel adds together 450.9g of a 22.0% solution of potassium carbonate and 275 grams of a 5.57m solution of Barium chlorate. How many grams of precipitate does she produce?

11. ## chemistry

ahhh im confused!! Calculate the pH of a solution formed by mixing 372 mL of a solution containing 4.4 x 10-6 M NaOH with 286 mL of 6.0 x 10-2 M NaOH. Report your answer to 2 decimal places.

asked by mark on November 16, 2007
12. ## chemistry

in making a solution of an unknown solid substance to test it for the presence of ions, would it matter if you used pure water or tap water to make the solution

asked by lester on December 17, 2009
13. ## chemistry

A 1.0 L solution has 10.00 grams of CaCl2 dissolved in it. What is the Molar solubility of AgCl in this same solution? The Ksp for AgCl is 1.6 x 10-10 at this temperature. Hint: watch out for the common ion again.

asked by bekah on April 12, 2014
14. ## Chemistry

Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.

asked by Jamie on April 16, 2013
15. ## chemistry(rusting)

Why metal(eg. iron)placed at aqueous solution will be more easily occur rusting?Is it due to the mobile ions in the aqueous solution ?Please give me an detail explanation ,thank you.

asked by Kong on November 4, 2011
16. ## help with chem biochem

You have a 1 ml solution containing 100 uM Ethanol, and 1 mM NAD+. You then add 1 mg of alcohol dehydrogenase. Assume all of the ethanol gets converted to acetaldehyde . a) What will the final concentration of NADH be in the solution?

asked by tracy on September 11, 2013
17. ## Chemistry

Give the half equations at the anode and cathode for a dilute hydrochloric acid,dilute copper chloride solution and the concentrated magnesium solution.

asked by Eddie on May 18, 2014
18. ## Chemistry

In a titration experiment, 15.0 mL of 0.10 M Ba(OH)2 is required to titrate a 10.0 mL of an unknown solution of HNO3. Calculate the concentration of the HNO3 solution using the data. 2HNO3 + Ba(OH)2 ® Ba(NO3)2 + 2H2O

asked by Kevin on April 18, 2018
19. ## Chemistry Help

Write a balanced equation for the reaction between an aqueous solution of calcium nitrate being mixed with an aqueous solution of sodium phosphate Identify the precipitate.

asked by Dan on November 14, 2012
20. ## Chemistry

A buffer solution of volume 100.0 mL is 0.140 M Na2HPO4(aq) and 0.120 M KH2PO4(aq). What are the pH and the pH change resulting from the addition of 55.7 mL of 0.0100 M NaOH(aq) to the buffer solution?

asked by Jessica on October 21, 2014
21. ## chemistry help

a 4.50 sample of LiCl at 25.0*C dissolves in 25.0 mL of water also at 25.0*C. The final equilibrium temperature of resulting solution is 60.8*C. What is the enthalpy of solution, of LiCL expressed in kilojoules per mole?

asked by bill on January 18, 2011
22. ## chemistry help

a 4.50 sample of LiCl at 25.0*C dissolves in 25.0 mL of water also at 25.0*C. The final equilibrium temperature of resulting solution is 60.8*C. What is the enthalpy of solution, of LiCL expressed in kilojoules per mole?

asked by bill on January 18, 2011
23. ## chemistry

what is the molarity of a solution prepared by dissolving 2.24 grams of NaOH in enough deionized water to obtain 500.0ml of solution?The molar mass of NaOH is 40.0g

asked by denis on October 30, 2011
24. ## chemistry

What are the products formed when sulfuric acid solution reacts with potassium hydroxide(KOH) solution? Is this correct H2SO4+KOH>KS04+H30

asked by Majra on November 20, 2007
25. ## Chemistry

A solution was prepared by dissolving 0.817g of sulfur S8, in 100.0g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution

asked by Lauren on February 7, 2008
26. ## Chemistry

Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.

asked by Jamie on April 16, 2013
27. ## chemistry

Calculate the solubility (in grams per 100 mL of solution) of magnesium hydroxide in a solution buffered at pH = 12. I can get the answer in grams per mole, but i am having difficulty changing it to g/100ml.

asked by moe on November 1, 2010
28. ## Chemistry

Calculate the volume of solution of 3.6 M NH4CI needed to prepare 350.0ml of 1.24 M NH4CI. How many grams of ammonium chloride are in the solution you created in the above problem.

asked by Donna on June 7, 2015
29. ## corrected repost chemistry

to what volume should you dilute 125mL of an 8.00M CuCl2 solution so that 50.0mL of the diluted solution contains 5.9g CuCl2 I have a hard time determing the M1V1=M2V2 is

asked by Monique on November 6, 2011
30. ## chemistry

what is the molarity of a solution prepared by dissolving 2.24 grams of NaOH in enough deionized water to obtain 500.0ml of solution?The molar mass of NaOH is 40.0g

asked by denis on October 31, 2011

Pretend you are a medical professional and it your job to make an I.V. solution for a patient that has a total cellular solute count of 1.19%. What would be the perfect I.V. solution to administer to your patient?

asked by Sal on October 6, 2017
32. ## Chemistry

A solution is made by dissolving 0.698 mol of nonelectrolyte solute in 777 g of benzene. Calculate the freezing point and boiling point of the solution

asked by Shardai on October 16, 2013
33. ## physics

a kicker kicks a football from the 5 yard line to the 45 yd line ( on the same half of the field). Ignoring air resistance, where along the trajectory is the speed of the football a minimum. what formuls is used and show work a) at the 5 yd line, just

asked by Alli on September 6, 2010
34. ## Stats

A sociology professor assigns letter grades on a test according to the following scheme. A: Top 14% of scores B: scores below the top 14% and above the bottom 55% C: scores below the top 45% and above the bottom 17% D: scores below the top 83% and above

asked by Benjamin on October 14, 2017

A student placed 11.0 of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-ml mark on the neck of the flask was reached. The flask was then shaken until the

asked by Rose on October 5, 2009
36. ## chemistry

A student placed 19.0g of glucose (c6h12o6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100ml.- mark on the neck of the flask was reached. The flask was then shaken until

asked by Heather on February 28, 2010
37. ## chem

A student placed 13.5g of glucose (\rm C_6H_{12}O_6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100. \rm mL mark on the neck of the flask was reached. The flask was then

asked by Anonymous on February 15, 2013
38. ## Health Care

Seven Organizational Approaches A. Use the matrix below to describe each approach to organizing information about the body. Discuss how each approach can be used. Approach Describe the approach How might the approach be used? Body planes and directions

asked by sue on May 30, 2008
39. ## Algerbra

The athletic department just received a shipment of footballs and basketballs. You don’t know how many there are, and don’t feel like counting. Here’s what you do know: each football costs 12 dollars, each basketball costs 15 dollars, and the credit

asked by samay on January 26, 2018
40. ## math

how do you know when an equation has infinate many solutions and how do you know if an equation has no solutions? The second part of this question I get. If you work an equation and come up with 5=3 this is not a solution. Is that part right? I guess I do

asked by barb on August 6, 2010
41. ## chemistry

an insoluble precipitate was formed when a solution of 1.000 L of 0.750 M sodium carbonate (Na2CO3) was mixed with .5000 L of 1.50 M solution of iron (III) nitrate (Fe(NO3)3). what is the concentration of all ions present after the reaction is complete?

asked by mel <3 on February 26, 2011
42. ## SCIENCE AGAIN

My book does not have this question in it either. I tried various web sites. Maybe someone could help. Thank you "__________ is the solution to pollution" is an old axiom responsible for much of our problems in estuarine contamination. I am guessing that

asked by Meg on May 17, 2007
43. ## Physical Sciences

I have a project practical investigation to do and I have no idea how to go about with it. The problem is: Calculate the mass of sodium hydroxide used to prepare a 0,5M NaOH solution in a 250ml volumetric flask. Determine the concentration of the acetic

asked by Cindy on August 10, 2012
44. ## Chemistry

80.0 ml of 1.50 M lead (IV) acetate is added to a 65.5 ml solution of 1.25 potassium chloride. 5.84 grams precipitate are collected. what is the percent yield? Calculate the concentrations of all ions remaining in solution. Okay so I know you have to

asked by Kenzie on November 7, 2016
45. ## Calculus

A three-sided fence is to be built next to a straight section of a river, which forms the fourth side of a rectangular region. The enclosed area is to equal 3200 m2. What is the minimum perimeter that such a fence can have? I developed two equations:

asked by Ian on November 23, 2006
46. ## algebra 1

I am studying for my final and I have several problems that I need help understanding. Here goes. s = 1/2gt^2 solve for g Tom earns $6,000 less than 2 times as much as Rachel. If their 2 incomes come to$60,000 how much does each make? A train leaves town

asked by Dippy on March 24, 2009
47. ## analogies

insurmountable: disadvantage Choices impermeable:water indomitable:defeat interminable:tedium inevitable:drawback insuperable:barrier and a sentence to prove How to solve analogies:

asked by jake on January 15, 2007
48. ## Physics

if measurements show precise position for an electron can those measurements show precise momentum aslo? Explain

asked by Tarea on November 20, 2009
49. ## Calculus

Show that f(x) = 2000x^4 and g(x) = 200x^4 grow at the same rate I know that they grow at the same rate because they are both raised to the same power, but i don't know how to show it.

asked by Henry on March 4, 2016
50. ## Math

My watch is 1 second fast each hour, and my friend's is 1.5 seconds slow each hour. Right now they show the same time. When will they show the same time again?

asked by Angle101 on November 10, 2007
51. ## english

how does Romeo show he is fearless when he kills Tybalt? and how does Romeo show hes fearless when he goes an see Juliet on the balcony?

asked by zackary on December 21, 2012
52. ## Chemistry (DrBob222)

Hi, here's my (almost) 2-paged lab report introduction (hopefully you remember it from yesterday). I went to class today, and actually a lot of my other classmates' introductions were over 2 pages! Now I'm feeling kind of insecure about mine, and I'm not

53. ## Physics

A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the coordinate system as follows: a 0.8 kg object at the origin, a 2.8 kg object at (0 m,1.7 m), and a 4.4 kg object at (3.8 m,0 m). Find the

asked by Chelsea on February 12, 2013
54. ## Cost acconting

(underapplied or overapplied overhead) At the end of 2010, jackson tank company's accounts showed a 66,000 credit balance in Manufacturing Overhead control. In addition, the company ahd the following account balances: Work in process inventory 384,000

asked by Anonymous on February 21, 2011
55. ## College Chemistry lab

How do I Calculate the concentration of iron(lll) with absorbance measurement. Wavelength is 480nm, solution is 1 ml FeCl3 : 9ml HCl, absorption is .250A, concentration of stock FeCl3 solution is 0.00050M and stock HCl solution is 2.0M. I not sure how to

asked by Hannah on October 13, 2014
56. ## Chemistry

Using calculations, determine how you would make a 525 ml pg a 0.50 M solution of Cl- ions using CaCl2. I am unsure how to do this question, I was going to use C1V1=C2V2 but with this I would be missing the first part of the equation. If that is the case,

asked by Heather on February 2, 2016
57. ## Physics Block System

Here is the diagram: h t t p ://img152.imageshack.us/img152/3126/blocksysiv5.png *delete spaces in "h t t p :" or it won't load What is the mass of block M that will allow it to accelerate from rest to the right with a a = 2 m/s^2? Surfaces are

asked by Will on May 1, 2008
58. ## chemistry

The molarity of urea in a solution prepared by dissolving 16 g of urea (MW 60.0g/mol) in 39 g of H2O is ______M. The density of the solution is 1.3 g/ml.

asked by CC on March 9, 2010
59. ## chemistry

Calculate the volume of solution needed to obtain 0.320 mol of KCl from a solution with a concentration of 0.64 mol dm-3

asked by John on April 10, 2014
60. ## chemistry

How would student make 500mL of .08500 M solution of iron using stock solution of .3180 M in iron(III)?

asked by zale on November 27, 2012
61. ## chemistry

anyone help me . .what volume of concentrated HCL solution whoch is 36% by mass and has a density of 1.179 g/ml , should be used to make 4.7 L of hcl solution with a pH of 1.8 ?

asked by m on February 13, 2013

critical thinking involves:coming up with the best solution, a thought process that is rationallogical &systematic, coming up with the best solution

asked by cindy wilson on April 6, 2013
63. ## Chemistry

If you take 3 mLs of a solution that is 4M acetic acid and add enough water to it to make 50 mLs, what is the molarity of the final solution? Thank you!

asked by Artemis on March 20, 2015
64. ## Chemistry

using a 6.0M stock solution and a 2.5M stock solution, create two 0.01M solutions of hydrochloric acid with a 250mL volume

asked by Jacob on March 25, 2016
65. ## Science

A solution contain 40 centimetre cube of alcohol mixed with 150 cm cube of water calculate the concentration of the solution

asked by Nasrin on May 28, 2017
66. ## GEN CHEM

A solution of CaCl2 is prepared by dissolving 1.004 g of the solid in approximately 30 mL of water. How many moles of CaCl2 does this solution contain?

asked by KRIS on March 3, 2013
67. ## Chemistry

By titration, 66.6 mL of aqueous H2SO4 neutralized 11.4 mL of 0.465 M LiOH solution. What was the molarity of the aqueous acid solution?

asked by Lane on March 14, 2017
68. ## Chemistry

A solution of HCL (.1053 M) is added to a solution of NaOH (50.0 mL) It takes 28.31 mL if the acid to neutralize the base (naOH).

asked by Nola on October 2, 2011
69. ## Chem 1010

15.3 g of KCl (MM = 74.55 g/mol) is dissolved in enough water to make 600 mL of solution. Calculate the molarity of the KCl solution.

asked by Sirena on April 10, 2012
70. ## Chemistry

What hydroxide concentration is required to (a) Initiate precipitation of Ag2CrO4 from a solution that is 2.12 x 10^-3 M in Ag+? (b) lower the Al^3+ concentration in the foregoing solution to 1.00 x 10^-9

asked by Sheila on January 29, 2019
71. ## Chemistry

A solution contains 1.50 g of dissolved Pb 2+ ions. How many grams of NaI must be added to the solution to completely precipitate all of the dissolved Pb 2+ as PbI2?

asked by annabel on April 24, 2012
72. ## Chemistry

What is the % ( m/ v) concentration of the calcium chloride solution 1000.00 grams which was dissolved in water to make 1000.00 mL of the solution

asked by Ruffles on December 4, 2013
73. ## Chemistry

Which is the more concentrated solution: a solution made with .70 moles of NaCl in a .35L water or a 35g of NaCl in .75L?

asked by Alexis on April 8, 2013
74. ## chemistry

If 2.29 mL of a stock solution of acetic acid with a concentration of 0.723 M is mixed with 15.75 mL of water, what is the concentration of the diluted solution?

asked by mel on May 5, 2015
75. ## Chemistry

12.5 g of KCl (MM = 74.55 g/mol) is dissolved in enough water to make 675 mL of solution. Calculate the molarity of the KCl solution.

asked by Alex on November 28, 2010
76. ## math

A solution contains 100 mg/mL of a drug and the recommended dose is 50 mg/Lb once a day. How much solution would be needed for one dose to be administered to a 20 kg patient?

asked by LYNN on July 21, 2008
77. ## chemistry

A solution of potassium nitrate in water has a freezing point of -0.082◦C. What is the concentration of KNO3 in this solution? Kf = 1.86 ◦C/m for water.

asked by razor on May 9, 2018
78. ## chemistry

A solution containing 26.05 mg of an unknown protein per 23.5 mL solution was found to have an osmotic pressure of 3.75 torr at 44 C. What is the molar mass of the protein?

asked by M on January 25, 2010
79. ## Chemistry

Determine how many mL of 0.102 mol NaOH solution is needed to neutralize 35.0 mL of 0.125 mol H2SO4 solution.

asked by Jc on July 22, 2017
80. ## chemistry

Ammonia acts as a base in aqueous solution; Kb is equal to 1.8 x 10-5. What is the Ka for the ammonium ion NH4+ in aqueous solution?

asked by Megan on October 31, 2008
81. ## chemistry

100 mL of a 0.1 mM buffer solution made from acetic acid and sodium acetate with pH 5.0 is diluted to 1 L. What is the pH of the diluted solution?

asked by Ash on October 10, 2014
82. ## Chemistry

what volume, in L, of a 10.0M HCL solution is needed to make 2.00L of 2.00m HCL solution by dilution with water. Thank you

83. ## chemistry

A dilute sulfuric acid solution that is 3.39 molality H2SO4 has a density of 1.18 g/mL. How many moles of H2SO4 are there in 375 mL of this solution?

asked by Nick on February 23, 2010
84. ## Chemistry

A solution containing 26.40 mg of an unknown protein per 22.5 mL solution was found to have an osmotic pressure of 3.95 torr at 21 C. What is the molar mass of the protein?

asked by RE on September 17, 2009
85. ## Physical Chemistry

A 1.00M sucrose solution freezes at -1.8 degree Celsius. What is the freezing point of 1.00M glucose solution?

asked by Winnie on August 10, 2016
86. ## chemistry

a gas solution contains 5 moles H2 and 10 moles of oxygen. what is the mole fraction of hydrogen and oxygenin the solution formed?

asked by chrisabel on December 13, 2011
87. ## chemistry

By titration, 26.7 mL of aqueous H2SO4 neutralized 26.2 mL of 0.028 M LiOH solution. What was the molarity of the aqueous acid solution?

asked by Ki-Ra on February 17, 2015
88. ## chemistry

A solution of NaOH with pH 13.68 requires 35.00 mL of 0.128 M HClO_4_ to reach the equivalence point. What is the volume of the NaOH solution?

asked by Savannah on March 8, 2012
89. ## chemistry

a solution contains 100g. H2O, 10g. NaCl and 15g. of methanol. What is the weight percent of methanol; in the solution?

asked by victoria on March 29, 2011
90. ## chemistry

enough of a monoprotic acid is dissolved in water to produce a 0.0111M solution. The pH of the resulting solution is 2.62. Calculate the Ka for the acid.

asked by airo on October 12, 2012
91. ## algebra 1 help

5) give one solution to the inequality 12x-3x+11

asked by hips on April 25, 2013
92. ## Chemistry

To what volume should you dilute 55mL mL of a 13M stock HNO 3 solution to obtain a 0.140M M HNO 3 solution?

asked by Anonymous on August 4, 2013
93. ## Chemistry

2S2O3 2- + I2 => S4o6 2- + 2I - If,in an experiment,0.05 mol S2O3 2- is consumed in 1.0L of solution each second,at what rates are S4O6 2- and I- produced in this solution?

asked by Yeneta on June 6, 2012
94. ## Chemistry

1)How many mL of H2O2 are in 969 mL in solution ? * Given: 5.0% of H2O2 by volume. 2)What is the mole fraction of the solute in a 1.35m solution of CaCl2?

asked by Jay on April 3, 2010
95. ## Chemistry

A 50mL solution of NaOH is neutralized by adding 37.5 mL of 0.045 M HCL. What was the original concentration of the NaOH solution?

asked by Julie on September 29, 2013
96. ## Chemistry

a solution is 0.0300 m in Sodium. How many grams of sodium carbonate are necessary to prepare 900.0 ml of this solution? I don't know where to start on this.

asked by Alex on September 28, 2012
97. ## Chemistry

To what volume should you dilute 55mL mL of a 13M M stock HNO 3 solution to obtain a 0.140M M HNO 3 solution?

asked by Anonymous on August 4, 2013
98. ## chemistry

25cm3 of a solution of 0.1mol dm-3 NaoH reacts with 50cm3 of a solution of hydrochloric acid.What is the molarity of the acid

asked by jonah on June 21, 2011
99. ## Chemistry

Enough of a monoprotic acid is dissolved in water to produce a 0.0169 M solution. The pH of the resulting solution is 2.68. Calculate the Ka for the acid.

asked by Lee on April 21, 2012
100. ## science

If solid copper sulfate is mixed with water, what is formed? A mixture, a solvent, a solution or both a mixture and a solution?

asked by sue on May 12, 2010