Question 1

Define a salt bridge.

Accepted Answer

A)  A pathway,composed of salt water,that ions pass through.
B)  A pathway in which no ions flow.
C)  A pathway between the cathode and anode in which ions are reduced.
D)  A pathway between the cathode and anode in which ions are oxidized.
E)  A pathway through which counterions can flow between the half-cells without the solutions in the half-cell totally mixing.

Question 2

The mixing of which pair of reactants will result in a precipitation reaction?

Accepted Answer

A)  Ba(NO3) 2(aq) + Na2CO3(aq) 
B)  K2SO4(aq) + Cu(NO3) 2(aq) 
C)  NaClO4(aq) + (NH4) 2S(aq) 
D)  NH4Br(aq) + NH4I(aq)

Question 3

Determine the molarity of a solution formed by dissolving 468 mg of MgI2 in enough water to yield 50.0 mL of solution.

Accepted Answer

A)  0.0297 mol L-1
B)  0.0337 mol L-1
C)  0.0936 mol L-1
D)  0.0107 mol L-1
E)  0.0651 mol L-1

Question 4

What is the concentration (M)of CH3OH in a solution prepared by dissolving 16.8 g of CH3OH in sufficient water to give exactly 230 mL of solution?

Accepted Answer

Question 5

What is the oxidation number of the sulfur atom in K2SO4 ?

Accepted Answer

A)  -2
B)  +2
C)  +4
D)  +6

Question 6

Which one of the following compounds behaves as an acid when dissolved in water?

Accepted Answer

A)  RaO
B)  C4H10
C)  HI
D)  RbOH

Question 7

Describe the difference between complete ionic and net ionic equations.

Accepted Answer

A complete ionic equation shows all of t...

Question 8

In an acid-base neutralization reaction,38.74 mL of 0.500 mol L-1 potassium hydroxide reacts with 50.00 mL of sulfuric acid solution.What is the concentration of the H2SO4 solution?

Accepted Answer

A)  0.194 mol L-1
B)  0.387 mol L-1
C)  0.775 mol L-1
D)  1.29 mol L-1

Question 9

According to the following reaction,how many grams of sulfur are formed when 37.4 g of water are formed? 2H2S(g) + SO2(g) → 3S(s) + 2H2O(l)

Accepted Answer

A)  99.8 g S
B)  66.6 g S
C)  56.1 g S
D)  44.4 g S
E)  14.0 g S

Question 10

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. 
Al(s) + I2(s) → Al2I6(s)

Accepted Answer

A)  0.741 mol
B)  1.67 mol
C)  2.22 mol
D)  3.33 mol

Question 11

If 100.mL of 0.400 mol L-1 Na2SO4 is added to 200.mL of 0.600 mol L-1 NaCl,what is the concentration of Na+ ions in the final solution? Assume that the volumes are additive.

Accepted Answer

A)  0.534 mol L-1
B)  0.667 mol L-1
C)  1.00 mol L-1
D)  1.40 mol L-1

Question 12

Balance the chemical equation given below,and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25 °C.The density of nitrogen monoxide at  25∘C25 ^ { \circ } \mathrm { C }25∘C  is 1.23 g L-1. ________ NH3(g) + ________ O2(g) ? ________ NO(g) + ________ H2O(l)

Accepted Answer

A)  7.32 L
B)  11.1 L
C)  11.5 L
D)  17.3 L

Question 13

Define an electrolyte.

Accepted Answer

A substance that dis...

Question 14

Identify the location of reduction in an electrochemical cell.

Accepted Answer

A)  the anode
B)  the cathode
C)  the electrode
D)  the salt bridge
E)  the socket

Question 15

Which of the following is an acid-base reaction?

Accepted Answer

A)  C(s) + O2(g) → CO2(g) 
B)  2HClO4(aq) + Ca(OH) 2(aq) → 2 H2O(l) + Ca(ClO4) 2(aq) 
C)  Fe(s) + 2AgNO3(aq) → 2Ag(s) + Fe(NO3) 2(aq) 
D)  MgSO4(aq) + Ba(NO3) 2(aq) → Mg(NO3) 2(aq) + BaSO4(s) 
E)  None of the above is an acid-base reaction.

Question 16

What element is undergoing oxidation (if any) in the following reaction? Zn(s) + 2AgNO3(aq) → Zn(NO3) 2(aq) + 2Ag(s)

Accepted Answer

A)  Zn
B)  N
C)  O
D)  Ag
E)  This is not an oxidation-reduction reaction.

Question 17

According to the following balanced reaction,how many moles of KO are required to exactly react with 5.44 moles of H2O? 
4KO(s) + 2H2O(l) → 4KOH(s) + O2(g)

Accepted Answer

A)  2.72 moles KO
B)  16.7 moles KO
C)  10.9 moles KO
D)  8.33 moles KO
E)  4.87 moles KO

Question 18

What is the oxidation number change for the bromine atom in the following unbalanced reduction half-reaction: 
Br O3- (aq) + H+(aq) → Br-(aq) + H2O(l)

Accepted Answer

A)  -7
B)  -6
C)  +6
D)  +7

Question 19

Balance the following equation:
________ C10H12 + ________ O2 → ________ H2O + ________ CO2

Accepted Answer

C₁₀H₁₂ + 13O₂→ ...

Question 20

Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride:  Ag+\mathrm { Ag } ^ { + }Ag+  (aq) +  Cl−\mathrm { Cl } ^ { - }Cl−  (aq) ? AgCl(s)  Silver chloride is virtually insoluble in water so that the reaction appears to go to completion.How many grams of solid NaCl must be added to 25.0 mL of 0.376 mol L-1  AgNO3\mathrm { AgNO } _ { 3 }AgNO3​  solution to completely precipitate the silver?

Accepted Answer

A)  6.22 × 103 g
B)  0.549 g
C)  0.161 g
D)  9.40 × 10-3 g
E)  1.61 × 10-4 g

Exam 4: Chemical Reactions and Stoichiometry

Balance the following equation: C₁₀H₁₂ + O₂→ H₂O + CO₂

Correct Answer
verified
C₁₀H₁₂ + 13O₂→ ...
View Answer

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. Al(s) + I₂(s) → Al₂I₆(s)

Correct Answer
verified

What element is undergoing oxidation (if any) in the following reaction? Zn(s) + 2AgNO₃(aq) → Zn(NO₃) ₂(aq) + 2Ag(s)

Correct Answer
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Which of the following is an acid-base reaction?

Correct Answer
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What is the concentration (M)of CH₃OH in a solution prepared by dissolving 16.8 g of CH₃OH in sufficient water to give exactly 230 mL of solution?

Correct Answer
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If 100.mL of 0.400 mol L^-1 Na₂SO₄ is added to 200.mL of 0.600 mol L^-1 NaCl,what is the concentration of Na⁺ ions in the final solution? Assume that the volumes are additive.

Correct Answer
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Identify the location of reduction in an electrochemical cell.

Correct Answer
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Define a salt bridge.

Correct Answer
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Define an electrolyte.

Correct Answer
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A substance that dis...
View Answer

In an acid-base neutralization reaction,38.74 mL of 0.500 mol L^-1 potassium hydroxide reacts with 50.00 mL of sulfuric acid solution.What is the concentration of the H₂SO₄ solution?

Correct Answer
verified

Describe the difference between complete ionic and net ionic equations.

Correct Answer
verified
A complete ionic equation shows all of t...
View Answer

According to the following balanced reaction,how many moles of KO are required to exactly react with 5.44 moles of H₂O? 4KO(s) + 2H₂O(l) → 4KOH(s) + O₂(g)

Correct Answer
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Which one of the following compounds behaves as an acid when dissolved in water?

Correct Answer
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Correct Answer
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What is the oxidation number of the sulfur atom in K₂SO₄?

Correct Answer
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The mixing of which pair of reactants will result in a precipitation reaction?

Correct Answer
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What is the oxidation number change for the bromine atom in the following unbalanced reduction half-reaction: BrO₃^-(aq) + H⁺(aq) → Br^-(aq) + H₂O(l)

Correct Answer
verified

Balance the chemical equation given below,and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25 °C.The density of nitrogen monoxide at $25 ^ { \circ } \mathrm { C }$ is 1.23 g L^-1. NH₃(g) + O₂(g) ? NO(g) + H₂O(l)

Correct Answer
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According to the following reaction,how many grams of sulfur are formed when 37.4 g of water are formed? 2H₂S(g) + SO₂(g) → 3S(s) + 2H₂O(l)

Correct Answer
verified

Determine the molarity of a solution formed by dissolving 468 mg of MgI₂ in enough water to yield 50.0 mL of solution.

Correct Answer
verified

Exam 4: Chemical Reactions and Stoichiometry

Balance the following equation: ________ C10H12 + ________ O2 → ________ H2O + ________ CO2

Correct AnswerverifiedC10H12 + 13O2 → ...View AnswerShow Answer

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. Al(s) + I2(s) → Al2I6(s)

Correct AnswerverifiedShow Answer

What element is undergoing oxidation (if any) in the following reaction? Zn(s) + 2AgNO3(aq) → Zn(NO3) 2(aq) + 2Ag(s)

Correct AnswerverifiedShow Answer

Which of the following is an acid-base reaction?

Correct AnswerverifiedShow Answer

What is the concentration (M)of CH3OH in a solution prepared by dissolving 16.8 g of CH3OH in sufficient water to give exactly 230 mL of solution?

Correct AnswerverifiedShow Answer

If 100.mL of 0.400 mol L-1 Na2SO4 is added to 200.mL of 0.600 mol L-1 NaCl,what is the concentration of Na+ ions in the final solution? Assume that the volumes are additive.

Correct AnswerverifiedShow Answer

Identify the location of reduction in an electrochemical cell.

Correct AnswerverifiedShow Answer

Define a salt bridge.

Correct AnswerverifiedShow Answer

Define an electrolyte.

Correct AnswerverifiedA substance that dis...View AnswerShow Answer

In an acid-base neutralization reaction,38.74 mL of 0.500 mol L-1 potassium hydroxide reacts with 50.00 mL of sulfuric acid solution.What is the concentration of the H2SO4 solution?

Correct AnswerverifiedShow Answer

Describe the difference between complete ionic and net ionic equations.

Correct AnswerverifiedA complete ionic equation shows all of t...View AnswerShow Answer

According to the following balanced reaction,how many moles of KO are required to exactly react with 5.44 moles of H2O? 4KO(s) + 2H2O(l) → 4KOH(s) + O2(g)

Correct AnswerverifiedShow Answer

Which one of the following compounds behaves as an acid when dissolved in water?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the oxidation number of the sulfur atom in K2SO4 ?

Correct AnswerverifiedShow Answer

The mixing of which pair of reactants will result in a precipitation reaction?

Correct AnswerverifiedShow Answer

What is the oxidation number change for the bromine atom in the following unbalanced reduction half-reaction: Br O3- (aq) + H+(aq) → Br-(aq) + H2O(l)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

According to the following reaction,how many grams of sulfur are formed when 37.4 g of water are formed? 2H2S(g) + SO2(g) → 3S(s) + 2H2O(l)

Correct AnswerverifiedShow Answer

Determine the molarity of a solution formed by dissolving 468 mg of MgI2 in enough water to yield 50.0 mL of solution.

Correct AnswerverifiedShow Answer

Balance the following equation: C₁₀H₁₂ + O₂→ H₂O + CO₂

Correct Answer
verified
C₁₀H₁₂ + 13O₂→ ...
View Answer

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 30.0 g of aluminum. Al(s) + I₂(s) → Al₂I₆(s)

Correct Answer
verified

What element is undergoing oxidation (if any) in the following reaction? Zn(s) + 2AgNO₃(aq) → Zn(NO₃) ₂(aq) + 2Ag(s)

Correct Answer
verified

Correct Answer
verified

What is the concentration (M)of CH₃OH in a solution prepared by dissolving 16.8 g of CH₃OH in sufficient water to give exactly 230 mL of solution?

Correct Answer
verified

If 100.mL of 0.400 mol L^-1 Na₂SO₄ is added to 200.mL of 0.600 mol L^-1 NaCl,what is the concentration of Na⁺ ions in the final solution? Assume that the volumes are additive.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A substance that dis...
View Answer

In an acid-base neutralization reaction,38.74 mL of 0.500 mol L^-1 potassium hydroxide reacts with 50.00 mL of sulfuric acid solution.What is the concentration of the H₂SO₄ solution?

Correct Answer
verified

Correct Answer
verified
A complete ionic equation shows all of t...
View Answer

According to the following balanced reaction,how many moles of KO are required to exactly react with 5.44 moles of H₂O? 4KO(s) + 2H₂O(l) → 4KOH(s) + O₂(g)

Correct Answer
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Correct Answer
verified

Correct Answer
verified

What is the oxidation number of the sulfur atom in K₂SO₄?

Correct Answer
verified

Correct Answer
verified

What is the oxidation number change for the bromine atom in the following unbalanced reduction half-reaction: BrO₃^-(aq) + H⁺(aq) → Br^-(aq) + H₂O(l)

Correct Answer
verified

Correct Answer
verified

According to the following reaction,how many grams of sulfur are formed when 37.4 g of water are formed? 2H₂S(g) + SO₂(g) → 3S(s) + 2H₂O(l)

Correct Answer
verified

Determine the molarity of a solution formed by dissolving 468 mg of MgI₂ in enough water to yield 50.0 mL of solution.

Correct Answer
verified