Question 1

Determine the oxidizing agent in the following reaction. 
Ni(s)+ 2AgClO4(aq)→ Ni(ClO4)2(aq)+ 2Ag(s)

Accepted Answer

A) Ag+ 
B) Ni 
C) Cl 
D) O 
E) This is not an oxidation-reduction reaction. 
A) Ag+ 
B) Ni 
C) Cl 
D) O 
E) This is not an oxidation-reduction reaction.

Question 2

What element is being oxidized in the following (unbalanced)redox reaction? Zn2+(aq)+ NH4+(aq)→ Zn(s)+ NO3- (aq)

Accepted Answer

A) Zn 
B) N 
C) H 
D) O 
A) Zn 
B) N 
C) H 
D) O

Question 3

Which one of the following compounds is insoluble in water?

Accepted Answer

A) Na2SO4 
B) KNO3 
C) BaSO4 
D) Li2CO3 
A) Na2SO4 
B) KNO3 
C) BaSO4 
D) Li2CO3

Question 4

What are the required coefficients to properly balance the following chemical reaction? H2(g)+ Cl2(g)→ HCl(g)

Accepted Answer

A) 1,1,2 
B) 2,2, $\frac{1}{2}$ 
C) 1,1,1 
D) 2,1,2 
E) 1,2,1 
A) 1,1,2 
B) 2,2, $\frac{1}{2}$ 
C) 1,1,1 
D) 2,1,2 
E) 1,2,1

Question 5

Which of the following compounds is an Arrhenius base?

Accepted Answer

A) CH3CO2H 
B) C6H5NH2 
C) HNO2 
D) H2SO4 
A) CH3CO2H 
B) C6H5NH2 
C) HNO2 
D) H2SO4

Question 6

Identify oxidation and reduction half cell reactions:
(a)Zn(s)→ Zn2+(aq)+ 2e⁻
(b)Cu2+(aq)+ 2e⁻ → Cu(s)
Write the name of reaction.

Accepted Answer

Question 7

Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide: 
$\mathrm { Pb } ^ { 2 + }$ (aq)+ $2 \mathrm { I } ^ { - }$ (aq)? $\mathrm { PbI } _ { 2 }$ (s) Lead iodide is virtually insoluble in water so that the reaction appears to go to completion.How many millilitres of 3.550 mol L-1 HI(aq)must be added to a solution containing 0.700 mol of $\mathrm { Pb } \left( \mathrm { NO } _ { 3 } \right) _ { 2 } ^ { ( a q ) }$ to completely precipitate the lead?

Accepted Answer

A) 197 mL 
B) 0.197 mL 
C) 394 mL 
D) 0.394 mL 
E) 2.54 × 10-3 mL 
A) 197 mL 
B) 0.197 mL 
C) 394 mL 
D) 0.394 mL 
E) 2.54 × 10-3 mL

Question 8

If the percent yield for the following reaction is 75.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq),are produced? 
3NO2(g)+ H2O(l)→ 2HNO3(aq)+ NO(g)

Accepted Answer

A) 30.8 g 
B) 41.1 g 
C) 54.8 g 
D) 69.3 g 
A) 30.8 g 
B) 41.1 g 
C) 54.8 g 
D) 69.3 g

Question 9

What are the required coefficients to properly balance the following chemical reaction? NO(g)+ H2O(g)? NH3(g)+ O2(g)

Accepted Answer

A) 4,6,4, $\frac { 5 } { 2 }$ 
B) 4,6,4,5 
C) 2,3,2,2 
D) 2,3,2,3 
E) 4,4,6,6 
A) 4,6,4, $\frac { 5 } { 2 }$ 
B) 4,6,4,5 
C) 2,3,2,2 
D) 2,3,2,3 
E) 4,4,6,6

Question 10

What is the reduction half-reaction for the following overall galvanic cell reaction? 
Co2+(aq)+ 2Ag(s)→ Co(s)+ 2 Ag+(aq)

Accepted Answer

A) Ag(s)+ e- → Ag+(aq) 
B) Ag+(aq)+ e- → Ag(s) 
C) Co2+(aq)+ 2 e- → Co(s) 
D) Co2+(aq)+ e- → Co(s) 
A) Ag(s)+ e- → Ag+(aq) 
B) Ag+(aq)+ e- → Ag(s) 
C) Co2+(aq)+ 2 e- → Co(s) 
D) Co2+(aq)+ e- → Co(s)

Question 11

What reagent could be used to separate Br- from CH3CO2- when added to an aqueous solution containing both?

Accepted Answer

A) AgNO3(aq) 
B) Ba(OH)2(aq) 
C) CuSO4(aq) 
D) NaI(aq) 
A) AgNO3(aq) 
B) Ba(OH)2(aq) 
C) CuSO4(aq) 
D) NaI(aq)

Question 12

Consider the following balanced reaction.What mass (in g)of CO2 can be formed from 288 mg of O2? Assume that there is excess C3H7SH present. C3H7SH(l)+ 6O2(g)→ 3CO2(g)+ SO2(g)+ 4H2O(g)

Accepted Answer

A) 0.396 g CO2 
B) 0.209 g CO2 
C) 0.792 g CO2 
D) 0.126 g CO2 
E) 0.198 g CO2 
A) 0.396 g CO2 
B) 0.209 g CO2 
C) 0.792 g CO2 
D) 0.126 g CO2 
E) 0.198 g CO2

Question 13

Give the theoretical yield,in moles,of CO2 from the reaction of 4.00 moles of C8H18 with 4.00 moles of O2. 
2C8H18 + 25O2 → 16CO2 + 18H2O

Accepted Answer

A) 0.640 moles 
B) 64.0 moles 
C) 2.56 moles 
D) 16.0 moles 
A) 0.640 moles 
B) 64.0 moles 
C) 2.56 moles 
D) 16.0 moles

Question 14

According to the following balanced reaction,how many moles of HNO3 are formed from 8.44 moles of NO2 if there is plenty of water present? 
3NO2(g)+ H2O(l)→ 2HNO3(aq)+ NO(g)

Accepted Answer

A) 2.81 moles HNO3 
B) 25.3 moles HNO3 
C) 8.44 moles HNO3 
D) 5.63 moles HNO3 
E) 1.83 moles HNO3 
A) 2.81 moles HNO3 
B) 25.3 moles HNO3 
C) 8.44 moles HNO3 
D) 5.63 moles HNO3 
E) 1.83 moles HNO3

Question 15

What is the concentration of NO3- ions in a solution prepared by dissolving 25.0 g of Ca(NO3)2 in enough water to produce 300.mL of solution?

Accepted Answer

A) 0.254 mol L-1 
B) 0.508 mol L-1 
C) 0.672 mol L-1 
D) 1.02 mol L-1 
A) 0.254 mol L-1 
B) 0.508 mol L-1 
C) 0.672 mol L-1 
D) 1.02 mol L-1

Question 16

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of ClO2 and H2O in the balanced reaction? 
H2O2(l)+ ClO2(aq)→ ClO2⁻(aq)+ O2(g)

Accepted Answer

A) ClO2 = 1,H2O = 1 
B) ClO2 = 1,H2O = 2 
C) ClO2 = 4,H2O = 3 
D) ClO2 = 4,H2O = 2 
E) ClO2 = 2,H2O = 2 
A) ClO2 = 1,H2O = 1 
B) ClO2 = 1,H2O = 2 
C) ClO2 = 4,H2O = 3 
D) ClO2 = 4,H2O = 2 
E) ClO2 = 2,H2O = 2

Question 17

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Cr(OH)4- and ClO- in the balanced reaction? 
Cr(OH)4- (aq)+ ClO- (aq)→ CrO42- (aq)+ Cl- (aq)

Accepted Answer

A) Cr(OH)4- = 2,ClO- = 3 
B) Cr(OH)4- = 1,ClO- = 1 
C) Cr(OH)4- = 1,ClO- = 2 
D) Cr(OH)4- = 2,ClO- = 6 
E) Cr(OH)4- = 6,ClO- = 5 
A) Cr(OH)4- = 2,ClO- = 3 
B) Cr(OH)4- = 1,ClO- = 1 
C) Cr(OH)4- = 1,ClO- = 2 
D) Cr(OH)4- = 2,ClO- = 6 
E) Cr(OH)4- = 6,ClO- = 5

Question 18

What is the molarity of a potassium triiodide solution,KI3(aq),if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.200 mol L-1 thiosulfate solution,K2S2O3(aq)? The chemical equation for the reaction is 2S2O32-(aq)+ I3-(aq)→ S4O62-(aq)+ 3I-(aq)

Accepted Answer

A) 0.0833 mol L-1 
B) 0.120 mol L-1 
C) 0.167 mol L-1 
D) 0.333 mol L-1 
A) 0.0833 mol L-1 
B) 0.120 mol L-1 
C) 0.167 mol L-1 
D) 0.333 mol L-1

Question 19

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Accepted Answer

A) HCl + LiOH 
B) Li2S + HCl 
C) K2CO3 + HNO3 
D) MgCl2 + KOH 
E) All of these solution pairs will produce a precipitate. 
A) HCl + LiOH 
B) Li2S + HCl 
C) K2CO3 + HNO3 
D) MgCl2 + KOH 
E) All of these solution pairs will produce a precipitate.

Question 20

List the spectator ions in the following reaction:
Ba+2(aq)+ 2OH-(aq)+ 2 Na+(aq)+ CO3-2(aq)→ 2 Na+(aq)+ 2OH-(aq)+ BaCO3(s)

Accepted Answer

Exam 4: Chemical Reactions and Stoichiometry

Determine the oxidizing agent in the following reaction. Ni(s)+ 2AgClO4(aq)→ Ni(ClO4)2(aq)+ 2Ag(s)

What element is being oxidized in the following (unbalanced)redox reaction? Zn2+(aq)+ NH4+(aq)→ Zn(s)+ NO3- (aq)

Which one of the following compounds is insoluble in water?

What are the required coefficients to properly balance the following chemical reaction? H2(g)+ Cl2(g)→ HCl(g)

Which of the following compounds is an Arrhenius base?

Identify oxidation and reduction half cell reactions: (a)Zn(s)→ Zn2+(aq)+ 2e⁻ (b)Cu2+(aq)+ 2e⁻ → Cu(s) Write the name of reaction.

If the percent yield for the following reaction is 75.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq),are produced? 3NO2(g)+ H2O(l)→ 2HNO3(aq)+ NO(g)

What are the required coefficients to properly balance the following chemical reaction? NO(g)+ H2O(g)? NH3(g)+ O2(g)

What is the reduction half-reaction for the following overall galvanic cell reaction? Co2+(aq)+ 2Ag(s)→ Co(s)+ 2 Ag+(aq)

What reagent could be used to separate Br- from CH3CO2- when added to an aqueous solution containing both?

Consider the following balanced reaction.What mass (in g)of CO2 can be formed from 288 mg of O2? Assume that there is excess C3H7SH present. C3H7SH(l)+ 6O2(g)→ 3CO2(g)+ SO2(g)+ 4H2O(g)

Give the theoretical yield,in moles,of CO2 from the reaction of 4.00 moles of C8H18 with 4.00 moles of O2. 2C8H18 + 25O2 → 16CO2 + 18H2O

According to the following balanced reaction,how many moles of HNO3 are formed from 8.44 moles of NO2 if there is plenty of water present? 3NO2(g)+ H2O(l)→ 2HNO3(aq)+ NO(g)

What is the concentration of NO3- ions in a solution prepared by dissolving 25.0 g of Ca(NO3)2 in enough water to produce 300.mL of solution?

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of ClO2 and H2O in the balanced reaction? H2O2(l)+ ClO2(aq)→ ClO2⁻(aq)+ O2(g)

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Cr(OH)4- and ClO- in the balanced reaction? Cr(OH)4- (aq)+ ClO- (aq)→ CrO42- (aq)+ Cl- (aq)

What is the molarity of a potassium triiodide solution,KI3(aq),if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.200 mol L-1 thiosulfate solution,K2S2O3(aq)? The chemical equation for the reaction is 2S2O32-(aq)+ I3-(aq)→ S4O62-(aq)+ 3I-(aq)

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

List the spectator ions in the following reaction: Ba+2(aq)+ 2OH-(aq)+ 2 Na+(aq)+ CO3-2(aq)→ 2 Na+(aq)+ 2OH-(aq)+ BaCO3(s)

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules,compounds,and Nomenclature

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

Liquids, solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Determine the oxidizing agent in the following reaction. Ni(s)+ 2AgClO₄(aq)→ Ni(ClO₄)₂(aq)+ 2Ag(s)

What element is being oxidized in the following (unbalanced)redox reaction? Zn²⁺(aq)+ NH₄⁺(aq)→ Zn(s)+ NO₃^- (aq)

What are the required coefficients to properly balance the following chemical reaction? H₂(g)+ Cl₂(g)→ HCl(g)

Identify oxidation and reduction half cell reactions: (a)Zn(s)→ Zn²⁺(aq)+ 2e⁻ (b)Cu²⁺(aq)+ 2e⁻ → Cu(s) Write the name of reaction.

If the percent yield for the following reaction is 75.0%,and 45.0 g of NO₂ are consumed in the reaction,how many grams of nitric acid,HNO₃(aq),are produced? 3NO₂(g)+ H₂O(l)→ 2HNO₃(aq)+ NO(g)

What are the required coefficients to properly balance the following chemical reaction? NO(g)+ H₂O(g)? NH₃(g)+ O₂(g)

What is the reduction half-reaction for the following overall galvanic cell reaction? Co²⁺(aq)+ 2Ag(s)→ Co(s)+ 2 Ag⁺(aq)

What reagent could be used to separate Br^- from CH₃CO₂^-when added to an aqueous solution containing both?

Consider the following balanced reaction.What mass (in g)of CO₂ can be formed from 288 mg of O₂? Assume that there is excess C₃H₇SH present. C₃H₇SH(l)+ 6O₂(g)→ 3CO₂(g)+ SO₂(g)+ 4H₂O(g)

Give the theoretical yield,in moles,of CO₂from the reaction of 4.00 moles of C₈H₁₈ with 4.00 moles of O₂. 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

According to the following balanced reaction,how many moles of HNO₃ are formed from 8.44 moles of NO₂if there is plenty of water present? 3NO₂(g)+ H₂O(l)→ 2HNO₃(aq)+ NO(g)

What is the concentration of NO₃^- ions in a solution prepared by dissolving 25.0 g of Ca(NO₃)₂ in enough water to produce 300.mL of solution?

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of ClO₂and H₂O in the balanced reaction? H₂O₂(l)+ ClO₂(aq)→ ClO₂⁻(aq)+ O₂(g)

Balance the following redox reaction if it occurs in basic solution.What are the coefficients in front of Cr(OH)₄^-and ClO^- in the balanced reaction? Cr(OH)₄^- (aq)+ ClO^- (aq)→ CrO₄²^- (aq)+ Cl^- (aq)

What is the molarity of a potassium triiodide solution,KI₃(aq),if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.200 mol L^-1 thiosulfate solution,K₂S₂O₃(aq)? The chemical equation for the reaction is 2S₂O₃^2-(aq)+ I₃^-(aq)→ S₄O₆^2-(aq)+ 3I^-(aq)

List the spectator ions in the following reaction: Ba⁺²(aq)+ 2OH^-(aq)+ 2 Na⁺(aq)+ CO₃^-2(aq)→ 2 Na⁺(aq)+ 2OH^-(aq)+ BaCO₃(s)