# 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 487

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 16, 2010
2. ## Trigonometry

Find all solutions for the following equation in the interval 0 ≤ x

asked by richard on May 4, 2010
3. ## chemistry

If 0.075 g of MgF2 dissolves per liter of solution, calculate the solubility-product constant. I got 2.0e-9 but it was not correct.

asked by Rebekah on April 27, 2011
4. ## chemistry

how can i Specify what ions are present in solution upon dissolving each of the following substances in water: ZnCl2, HNO3, (NH4)2SO4,Ca(OH)2

asked by nina on October 4, 2009
5. ## chemistry

What is the mass of dry NaCl sample should be taken for 100 cm3 of 0.5 mol/dm3 aqueous solution?

asked by michelle on November 15, 2012
6. ## chemistry

14. The reaction H2S (aq) = HS-(aq)+ H+(aq) has pK = 7 at 298 K, 1bar. Consider a solution in which total dissolved sulfur is 10^-5 molal. At pH = 3, pH2S =

asked by Anonymous on May 12, 2013
7. ## Chemistry

5.85 g of sodium chloride(NaCl) is dissolved in 250 mL OF solution. Calculate mass percentage of the solute.

asked by Dewa on October 28, 2011
8. ## College Algebra

A compound inequality uses one of the words and or or. Explain how you will determine whether to use the intersection or union when graphing the solution set

asked by Mark on January 25, 2014
9. ## chemistry

What is the molality of a solution consisting of 34.0 mL of benzene (C6H6; d = 0.877 g/mL) in 187 mL of hexane (C6H14 ; d = 0.660 g/mL)?

asked by prince flahn on May 2, 2017
10. ## Chemistry

What is the molarity of a nitric acid solution prepared by diluting 250.0 mL of 6.00 M HNO3 to a total volume of 2.50 L?

asked by Anonymous on April 17, 2010
11. ## chemistry

Assuming that the volumes are additive, what volume of water must be added to 35.0mL of 23.0 M HCl to make a solution which is 3.00 M?

asked by Denise on April 13, 2011
12. ## chemistry

A current of 0.965 A is passed through 500 ml of 0.2 M solution of ZnSO4 for 10 min. The molarity of Zn 2+ after deposition of Zn is 1. 0.1M 2. 0.5M 3. 0.8M 4. 0.194M

asked by hriday on February 23, 2009
13. ## Chemistry

How many grams of nitric acid (HNO3) must be dissolved in 740 mL of water to make a solution with a pOH = 8.3?

asked by Natasha on May 12, 2013
14. ## chemistry

A laboratory procedure calls for making 400.0 mL of a 1.1 M NnO3 solution. What mass of NaNO3 (in g) is needed?

asked by Stacy on October 13, 2010
15. ## biology - requirements of diffusion?

The process of diffusion requires .. A) a cell membrane B) an aqueous solution C) difference in the concentration gradient D) a, b, & c

asked by Melaniee on November 27, 2007
16. ## chemistry

What is the concentration, in parts per million (ppm), of an aqueous solution of copper sulfate II (CuSO4) at 12% by weight?

asked by damon on May 24, 2019
17. ## science

If solid copper sulfate is mixed with water,______ is formed. A. a mixture B. a solution C. a solvent D. both A and B

asked by stephanie on October 18, 2011
18. ## Chemistry

asked by Anon on November 20, 2013

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 16, 2010
20. ## Math

Explain why the vertices of a solution region are important when using linear systems of inequalities for optimization problems ?

asked by Tina on April 20, 2011
21. ## AP Chem

Lead metal is added to a solution of hydrochloric acid. What would be the theoretical cell potential, E°, for the reaction?

asked by Sam on April 13, 2015
22. ## Chemistry

Calculate the [H+] of a solution obtained by mixing 1 L of hydrochloric acid 1.0 M with 1 litre of sodium hydroxide 0.990 M.

asked by Katie on May 11, 2012
23. ## Chemistry

What is pH if 0.02M NaOH is added to buffer solution, consisting 0.4M aqueous NH3 & 0.3M NH4Cl(Kb=0.000018)

asked by Solution on January 3, 2016
24. ## Chemistry

If a piece of copper metal is dipped into a solution containing Cr3+ ions, what will happen? Explain with Ev values

asked by Jake on May 15, 2012
25. ## Chemistry

What is the concentration of Hg^2+ in 500.0 mL of a solution that was originally 0.011 M Hg^2+ and had 73 g of KI added to it? Hg^2+(aq) + 4I^-(aq) HgI4^2-(aq) The overall formation constant is 1x10^30

asked by Andrew on June 4, 2012
26. ## chemistry

What would be the pH of a solution that liberates carbon dioxide from sodium carbonate. Give chemical equation and reason

asked by clive on July 14, 2015
27. ## Chemistry

What is the concentration of a solution prepared by diluting 25.0 mL of HCL 0.750 mol/L to a final volume of 500.mL?

asked by April on April 30, 2008
28. ## Chemistry

What mass of NaNo3 would be required to prepare 10% solution of the salt in 100cm square of distilled water

asked by Osegbe on July 1, 2011
29. ## Math

period of a 100 MHz FM radio were is roughly 1 X 10 to the negative 8th s. formulate a problem and solution.

asked by Ivan on January 3, 2016
30. ## Chemistry

How many grams of solid silver nitrate would you need to prepare 240.0mL of a 0.160M AgNO3 solution?

asked by Isa on September 30, 2014
31. ## Math

Calculate the morality of a solution made by mixing 250ml of 0.75M H2SO4 with 400ml of 2.5MH2SO4

asked by Alica on March 26, 2013
32. ## Chemistry

Determine the sulfate ion concentrate in a solution prepared by diluting 15.00 ml of 0.115 M Y2(so4)3 with 35 ml of water?

asked by Al on September 12, 2013
33. ## General Chem II

When the equation Cl2 ---> Cl- + ClO3- (basic solution) is balanced using the smallest whole-number coefficients, the coefficient of OH- is??

asked by DarcY H on March 9, 2011
34. ## Chemistry

if a photon of light has an energy of 2.35x10^-19 J, calculate the frequency and wave length. What solution do I use to get the answer?

asked by Nicole on October 21, 2015
35. ## college inorganic chem

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 12, 2010
36. ## science

why potassium stock with 10000mg/L is added to the sodium standard solution with 20mg/L during the preparation for aas?

asked by saymyname on July 27, 2011
37. ## Chemistry

Prepare 250ml of 0.2M phosphate buffer of pH 6.4.starting from Na2HPO4,NaH2PO4,0.129N NaOH solution.

asked by Rita on July 10, 2015
38. ## calculus

find solution to differential equation given the initial conditions DQ/dt=Q/5 Q= 50 when t= 0 i don't understand this one because of the division sign.

asked by Daniel on December 4, 2008
39. ## chem "help"

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 13, 2010
40. ## Chemistry

What is the concentration of a solution prepared by diluting 25.0 mL of HCl 0.750 mol/L to a final volume of 500. mL?

asked by Kate on May 2, 2008
41. ## Chemistry

How do I calculate the amounts of Na2SO4 and CaCl2 that I need to create a solution of CaSO4 at 9 grams/Liter concentration?

asked by Kato on September 1, 2016
42. ## math

oh, please help me post a linear programming questiion with solution(graphical)please i need it nao..and i cant find it on the internet thx

asked by hello on June 21, 2009
43. ## Chemistry

What is the period 6 element that forms a 4+ ion with a pseudo-noble gas configuration? How can I find the solution? Thanks

asked by Ceamus Angelina on April 6, 2018
44. ## Chemistry

A solution is prepared by adding 50ml of 0.050M HCl to 150 ml of 0.10M HNO3. Calculate pH

asked by sydney on May 6, 2019
45. ## calculus

Find the domain for the particular solution to the differential equation dy dx equals the quotient of 3 times y and x, with initial condition y(1) = 1.

asked by Bree on May 20, 2016
46. ## Chemistry

What is the mass (g) of nickel(II) nitrate (182.71 g/mol) dissolved in 160.4 mL of 0.100 M Ni(NO3)2 solution?

asked by Linzy on April 8, 2013
47. ## Chemistry

The osmotic pressure of a liquid at 320 K is 145 kPa. Calculate the freezing point of the solution.

asked by David on November 29, 2011
48. ## Chemistry

Ca(OH)2 has a Ksp of 6.5×10−6. If 0.370 g of Ca(OH)2 is added to 500 mL of water and the mixture is allowed to come to equilibrium, will the solution be saturated?

asked by Darcy on November 30, 2017
49. ## chemistry

Find the quantity of heat produced when 100ml of 0.1N HCL is completely neutralised with NAOH solution

asked by chinmay on March 27, 2016
50. ## Chemistry

Given the following standard reduction potentials in acid solution write the formula of the weakest reducing agent.

asked by Durbin23 on May 7, 2017
51. ## chemistry

What is the final concentration of 35.7mL of 52.0% m/m solution that is diluted to 65.9ml? i am not sure how to caluclate this... but i know the formula is C1V1=C2V2

asked by danny on December 16, 2014
52. ## math

identify the choice that best completes the statement or answers the question. For questions 1-3, what is the solution of the systems? Use subsitution. 1. y = x + 6 y = 2x

asked by liv on May 7, 2018
53. ## Chemistry

If vinegar sample #1 requires 29.05 mL of NaOH solution to reach an endpoint, what volume should be required for samples #2 and #3?

54. ## Chemistry II

Calculate how many milliliters of 0.100 M HCl must be added to 25.0 ml of a 0.200 M solution of NH3 to prepare a buffer that has a pH of 9.50? Kb = 1.76 x 10^-5

asked by Terence on June 29, 2011
55. ## college chemistry

Balance the equation in aqueous basic solution: Fe(CN)64-(aq) + Ce4+(aq) → Ce3+(aq) + Fe3+(aq) + CO32-(aq) + NO3-(aq)

asked by sparkle on November 4, 2010
56. ## Chemistry

A mass of 0.100 mg TIOH is mixed with 174 ml of pure water. Calculate the pH of this aqueous solution?

asked by Kelly on January 23, 2016
57. ## Chemistry

Pb(NO3)2(aq) + NaSO4(aq) → PbSO4(s)+ 2NaNO3(aq) Identify the ions that are present in each solution, and calculate their concentrations.

asked by Sam on May 16, 2012
58. ## Science (Chem)

Given below are aqueous solutions of strong electrolytes. For each solution, specify the concentration of each ion 0.15 M NH4NO3 (aq) 0.120M Mg(NO3)2(aq)

asked by Kevin on May 5, 2018
59. ## chemistry

A chemist dilutes 144.0 mL of 0.0743 M HCl with 775.0 mL of water. Determine the pH of the diluted solution. 1.86, 1.13, 2.08, 1.93, 12.07

asked by Anonymous on December 5, 2011
60. ## chemistry

What is the molality of a solution composed of 192g of acetone ((CH3)2CO) dissolved in 416g of water

asked by Anonymous on February 25, 2010
61. ## chemistry

The molarity of a solution prepared by dissolving 15.0 grams of NaCl in 100 mL water is 0.15 M. True or False

asked by Anonymous on December 5, 2011
62. ## chemistry

Calculate the concentration, in percent by mass, of a refrigerant brine solution which is 4.03 M in NaCl with a density of 1.116 g mL-1.

asked by keely on November 9, 2007
63. ## math

period of a 100 MHz FM radio were is roughly 1 X 10 to the negative 8th s. formulate a problem and solution.

asked by jm on September 19, 2015
64. ## Organic Chemistry

how many grams of ZnCl2 are needed to prepare 250 ml of an aqueous solution with an osmolarity equal to 0.300?

asked by Jules on March 6, 2012
65. ## chemistry

What is the molarity of OH- in a 7.68×10-4 M NaClO solution that hydrolyzes according to the equation. ClO-(aq) + H2O(l) = OH-(aq) + HClO(aq) Constants: Kh=2.86×10-7 Can someone help me figure this one out?

asked by axl on November 4, 2010
66. ## Pre-calculus

write the complex number -5 in polar form. I don't get how to do this because arctan of b/a would be 5/0 which is a fraction with no solution. Also, is a zero? Sorry if I'm being confusing! Thank you!

asked by Ellie on September 12, 2015
67. ## Chemistry

A 5.00g of sodium chloride is Dissolved m, exactly 250 mL calibrated volumetric flask, what is the molarity of the solution?

asked by Dillan on February 22, 2017
68. ## chemistry

how many grams of beryllium chloride would you need to add to 125 ml of water to make a .050 molal solution

asked by collin on February 3, 2011
69. ## chemistry

Give the concentration in meters when 3.51 moles of HNO3 are dissolved in enough water to make 1.2 liters of solution

asked by Evan on March 5, 2012
70. ## chemistry

How many grams of sodium chloride are needed to prepare a 0.400m NaCl solution that contains 750g of water?

asked by ANA on February 3, 2011
71. ## chemistry

What volume of solution should be dispensed from the buret to provide 3.718 mmol CO3 2-? answer in units of mL.

asked by chemistrry help! on May 2, 2010
72. ## analytical chem

What is the pH of a solution by dissolving 8.00 mmol of NaOAC in 200 mL of 0.100 m HOAC. (you need the pka for acetic acid)

asked by ak on December 6, 2012
73. ## Chemistry

What is the vapor pressure of a aqueous solution containing 10 % (by weight) ethylene glycol (62 g/mol) at 25 °C. PH2O = 24.3 torr at 25°C?

asked by Marcus on February 10, 2013
74. ## Ochem

What volume of 6.83% (wt./vol.) NaOCl solution is required to oxidize 223 mg of 9-fluorenol to 9-fluorenone? Please help me set this up!

asked by Darby on February 1, 2012
75. ## chemistry

a sample of 0.002 mole of HCL is dissolved in water to make a 2000mL solution. What is the molarity?

asked by kate on December 7, 2011
76. ## college chemistry

Balance the equation in aqueous acidic solution: C2O42-(aq) + MnO4-(aq) → Mn2+(aq) + CO2(g) please teach me how to do it!

asked by sparkle on November 4, 2010
77. ## biology

you added 3ml stock solution of 0.05mg/ml of dye and 7ml of water, what will be the final concerntration.

asked by cindy on February 21, 2017
78. ## chemistry

For each solution whose pH value deviated from 7.0 by at least 1.0 pH unit, give an equation accompanied by a statement which gives the reasons and/or explanation for the deviation.

asked by mary on January 31, 2012
79. ## Chemistry

Nicotine is a basic substance and its dissociation constant is about 1.0 x 10-6. To prepare a solution water with 0.01 mol L-1, calculate the PH

asked by Alan on January 22, 2016
80. ## chemistry

If i have 12 grams of potassium chlorate dissolved in 100g of water at 65 celsius how much would i need to make the solution saturated

81. ## chemistry

For each solution whose pH value deviated from 7.0 by at least 1.0 pH unit, give an equation accompanied by a statement which gives the reasons and/or explanation for the deviation.

asked by mary on January 31, 2012
82. ## grammar

Fill up the blanks using if or unless. 1.we can have dinner---- the food is ready. 2.Don't write anything----you are sure about the answer. 3.Please help me out-----you know the solution to this problem.

asked by ra ny on December 4, 2008
83. ## chemistry

The disssociation constant of benzoic acid is 1x10 power -4 . the pH of 0.01M solution of its sodium salt will be......?

84. ## math

How many positive integers less than 1020 have all their digits the same? also give the solution kindly,,,,,,,,,and thanx a lot for the last question's answer

asked by jamesbond on May 13, 2013
85. ## Chemistry

A current of 2.34 A is delivered to an electrolytic cell for 85 minutes. How many grams of Au will be deposited from an aqueous solution of AuCl3?

asked by Danielle on April 28, 2013
86. ## Chem question?

I have a homework question that says, If you were dissolving table salt in a beaker of water, what would a saturated solution look like (macroscopically)?

asked by Lisa on May 27, 2008
87. ## solution making/ chemistry/biotech

how much of a .2M solution can you make with 340 g of calcium carbonate ( MW=100.0869) Do I multiply 340g by 1mole/MW

asked by sonya on September 30, 2014
88. ## Chemistry

The environmental protection agency allows 10 ppb concentration of arsenic in drinking water. What is the molarity of As in this solution?

89. ## ap chemistry

Consider the reaction 2 Al2O3(s) -> 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol How much heat is generated when 0.455 L of a 3.60 M Al solution reacts with 1.05 mole O2 ?

asked by cheri on October 31, 2012
90. ## ap chemistry

Consider the reaction 2 Al2O3(s) ! 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ?

asked by cheri on October 31, 2012
91. ## Chemistry

What would be the pH of a 0.1 M aqueous solution of the phenolate ion, C6H5O–? (Ka for phenol, C6H5OH, is 1.3 x 10–10) I got the answer 5.44 but I think it's wrong. Do I have to subtract it from 14?

asked by Nat on July 6, 2013
92. ## geometry

Which of the following choices represents a type of problem with an angle as a solution? cos0 Arcsin 0.5 secB tan60

asked by D.J on April 23, 2018
93. ## chem

what is the cell voltage when saturated calomel and Pt electrodes are dipped into a solution containing 0.00217 M Br2 (aq) and 0.234 M Br^-

asked by katya on November 24, 2008
94. ## Chemistry

How many moles of HCl must be added to 100mL of a 0.100 M solution of methylamine (pKb=3.36) to give a buffer having a pH of 10.0?

asked by Joe on April 24, 2011
95. ## math

320ml of active ingredient is added to 680ml of an alcohol base solution. what is the final strength (v/v)?

asked by Anonymous on December 9, 2012
96. ## chemistry

Calculate the ionic strength of 100mM solution of Mg3(PO4)2 in 10 mM acetic buffer (CH3COONa)

asked by Nan on December 14, 2011
97. ## Chemistry

How many milliliters of an aqueous solution of 0.138 M potassium nitrate is needed to obtain 19.4 grams of the salt?

asked by Ashlei on July 3, 2017
98. ## chemisty

how many grams of sucrose must be dissolved in 1.5kg of water ot produce a solution which has a freezing point of -2.40 degrees C?

asked by Joan on April 14, 2013
99. ## Chemistry

A current of 2.34 A is delivered to an electrolytic cell for 85 minutes. How many grams of Au will be deposited from an aqueous solution of AuCl3?

asked by Danielle on April 28, 2013
100. ## Chemistry

How many grams of solute are required to make a 976 mL solution of sodium hydroxide with a concentration of 0.0783 M?

asked by Alex on May 16, 2016