Question 1

Based on the solubility rules, which of these processes will occur when solutions of ZnSO4(aq) and MgCl2(aq) are mixed?

Accepted Answer

A) ZnCl2 will precipitate; Mg2+ and SO42− are spectator ions. 
B) ZnSO4 will precipitate; Mg2+ and Cl− are spectator ions. 
C) MgSO4 will precipitate; Zn2+ and Cl− are spectator ions. 
D) MgCl2 will precipitate; Zn2+ and SO42− are spectator ions. 
E) No precipitate will form. 
A) ZnCl2 will precipitate; Mg2+ and SO42− are spectator ions. 
B) ZnSO4 will precipitate; Mg2+ and Cl− are spectator ions. 
C) MgSO4 will precipitate; Zn2+ and Cl− are spectator ions. 
D) MgCl2 will precipitate; Zn2+ and SO42− are spectator ions. 
E) No precipitate will form.

Question 2

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 → __ CO2 + __ H2O

Accepted Answer

A) 1 
B) 8 
C) 9 
D) 26 
E) 27 
A) 1 
B) 8 
C) 9 
D) 26 
E) 27

Question 3

In the reaction 5H2O2 + 2MnO4− + 6H+ → 2Mn2+ + 8H2O + 5O2, what is the oxidizing agent?

Accepted Answer

A) H2O2 
B) MnO4− 
C) H+ 
D) Mn2+ 
E) O2 
A) H2O2 
B) MnO4− 
C) H+ 
D) Mn2+ 
E) O2

Question 4

Which of these equations does not represent an oxidation-reduction reaction?

Accepted Answer

A) 3Al + 6HCl → 3H2 + AlCl3 
B) 2H2O → 2H2 + O2 
C) 2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3 
D) 2NaI + Br2 → 2NaBr + I2 
E) Cu(NO3)2 + Zn → Zn(NO3)2 + Cu 
A) 3Al + 6HCl → 3H2 + AlCl3 
B) 2H2O → 2H2 + O2 
C) 2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3 
D) 2NaI + Br2 → 2NaBr + I2 
E) Cu(NO3)2 + Zn → Zn(NO3)2 + Cu

Question 5

Balance the following equation: B2O3(s) + HF(l) → BF3(g) + H2O(l)

Accepted Answer

A) B2O3(s) + 6HF(l) → 2BF3(g) + 3H2O(l) 
B) B2O3(s) + H6F6 (l) → B2F6(g) + H6O3(l) 
C) B2O3(s) + 2HF(l) → 2BF3(g) + H2O(l) 
D) B2O3(s) + 3HF(l) → 2BF3(g) + 3H2O(l) 
E) B2O3(s) + 6HF(l) → 2BF3(g) + 6H2O(l) 
A) B2O3(s) + 6HF(l) → 2BF3(g) + 3H2O(l) 
B) B2O3(s) + H6F6 (l) → B2F6(g) + H6O3(l) 
C) B2O3(s) + 2HF(l) → 2BF3(g) + H2O(l) 
D) B2O3(s) + 3HF(l) → 2BF3(g) + 3H2O(l) 
E) B2O3(s) + 6HF(l) → 2BF3(g) + 6H2O(l)

Question 6

Which chemical equation describes a combustion reaction?

Accepted Answer

A) 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) 
B) LiOH(aq) + HNO3(aq) → LiNO3(aq) + H2O(l) 
C) N2(g) + 3H2(g) → 2NH3(g) 
D) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) 
E) 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) 
A) 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) 
B) LiOH(aq) + HNO3(aq) → LiNO3(aq) + H2O(l) 
C) N2(g) + 3H2(g) → 2NH3(g) 
D) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) 
E) 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)

Question 7

What is the reducing agent in the following reaction? 5Fe2+(aq) + MnO4−(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l)

Accepted Answer

A) Fe2+ 
B) MnO4− 
C) H+ 
D) Mn2+ 
E) Fe3+ 
A) Fe2+ 
B) MnO4− 
C) H+ 
D) Mn2+ 
E) Fe3+

Question 8

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Na + ___ H2O → ___ NaOH + ___ H2

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 9

Which salt is produced by the neutralization of potassium hydroxide with sulfuric acid?

Accepted Answer

A) KSO3 
B) K2(SO4)3 
C) K2SO4 
D) K(SO4)2 
E) KSO4 
A) KSO3 
B) K2(SO4)3 
C) K2SO4 
D) K(SO4)2 
E) KSO4

Question 10

Balance the following equation: UO2(s) + HF(l) → UF4(s) + H2O(l)

Accepted Answer

A) UO2(s) + 2HF(l) → UF4(s) + H2O(l) 
B) UO2(s) + 4HF(l) → UF4(s) + 2H2O(l) 
C) UO2(s) + H4F4(l) → UF4(s) + H4O2(l) 
D) UO2(s) + 4HF(l) → UF4(s) + 4H2O(l) 
E) UO2(s) + 8HF(l) → 2UF4(s) + 4H2O(l) 
A) UO2(s) + 2HF(l) → UF4(s) + H2O(l) 
B) UO2(s) + 4HF(l) → UF4(s) + 2H2O(l) 
C) UO2(s) + H4F4(l) → UF4(s) + H4O2(l) 
D) UO2(s) + 4HF(l) → UF4(s) + 4H2O(l) 
E) UO2(s) + 8HF(l) → 2UF4(s) + 4H2O(l)

Question 11

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ Cr + ___ H2SO4 → ___ Cr2(SO4)3 + ___ H2

Accepted Answer

A) 4 
B) 9 
C) 11 
D) 13 
E) 15 
A) 4 
B) 9 
C) 11 
D) 13 
E) 15

Question 12

What is the reducing agent in the following reaction? Mg + NiO2 + 2H2O → Mg(OH)2 + Ni(OH)2

Accepted Answer

A) Mg 
B) NiO2 
C) H2O 
D) Mg(OH)2 
E) Ni(OH)2 
A) Mg 
B) NiO2 
C) H2O 
D) Mg(OH)2 
E) Ni(OH)2

Question 13

Which of these chemical equations does not describe a redox reaction?

Accepted Answer

A) 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l) 
B) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) 
C) 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) 
D) 2KNO3(s) → 2KNO2(s) + O2(g) 
E) 2LiOH(aq) + H2SO4(aq) → Li2SO4(aq) + 2H2O(l) 
A) 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l) 
B) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) 
C) 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) 
D) 2KNO3(s) → 2KNO2(s) + O2(g) 
E) 2LiOH(aq) + H2SO4(aq) → Li2SO4(aq) + 2H2O(l)

Question 14

Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW2
If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 15

Which salt is produced by the neutralization of nitric acid with calcium hydroxide?

Accepted Answer

A) CaNO3 
B) Ca2(NO3)3 
C) Ca3(NO3)2 
D) Ca2NO3 
E) Ca(NO3)2 
A) CaNO3 
B) Ca2(NO3)3 
C) Ca3(NO3)2 
D) Ca2NO3 
E) Ca(NO3)2

Question 16

Balance the following equation for the combustion of benzene: C6H6(l) + O2(g) → H2O(g) + CO2(g)

Accepted Answer

A) C6H6(l) + 9O2(g) → 3H2O(g) + 6CO2(g) 
B) C6H6(l) + 9O2(g) → 6H2O(g) + 6CO2(g) 
C) 2C6H6(l) + 15O2(g) → 6H2O(g) + 12CO2(g) 
D) C6H6(l) + 15O2(g) → 3H2O(g) + 6CO2(g) 
E) 2C6H6(l) + 9O2(g) → 6H2O(g) + 12CO2(g) 
A) C6H6(l) + 9O2(g) → 3H2O(g) + 6CO2(g) 
B) C6H6(l) + 9O2(g) → 6H2O(g) + 6CO2(g) 
C) 2C6H6(l) + 15O2(g) → 6H2O(g) + 12CO2(g) 
D) C6H6(l) + 15O2(g) → 3H2O(g) + 6CO2(g) 
E) 2C6H6(l) + 9O2(g) → 6H2O(g) + 12CO2(g)

Question 17

If aqueous solutions of Mg(C2H3O2)2 and LiOH are mixed, which insoluble precipitate is formed?

Accepted Answer

A) LiC2H3O2 
B) Li(C2H3O2)2 
C) MgOH 
D) Mg(OH)2 
E) CH3OH 
A) LiC2H3O2 
B) Li(C2H3O2)2 
C) MgOH 
D) Mg(OH)2 
E) CH3OH

Question 18

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Al4C3 + ___ H2O → ___ Al(OH)3 + ___ CH4

Accepted Answer

A) 3 
B) 4 
C) 6 
D) 12 
E) 24 
A) 3 
B) 4 
C) 6 
D) 12 
E) 24

Question 19

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ CH4 + ___ Cl2 → ___ CCl4 + ___ HCl

Accepted Answer

A) 4 
B) 6 
C) 8 
D) 10 
E) 12 
A) 4 
B) 6 
C) 8 
D) 10 
E) 12

Question 20

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? __ C2H4 + __ O2 → __ CO2 + __ H2O

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 6 
A) 1 
B) 2 
C) 3 
D) 4 
E) 6

Based on the solubility rules, which of these processes will occur when solutions of ZnSO₄(aq) and MgCl₂(aq) are mixed?

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ → CO₂ + H₂O

In the reaction 5H₂O₂ + 2MnO₄⁻ + 6H⁺ → 2Mn²⁺ + 8H₂O + 5O₂, what is the oxidizing agent?

Which of these equations does not represent an oxidation-reduction reaction?

Balance the following equation: B₂O₃(s) + HF(l) → BF₃(g) + H₂O(l)

Which chemical equation describes a combustion reaction?

What is the reducing agent in the following reaction? 5Fe²⁺(aq) + MnO₄⁻(aq) + 8H⁺(aq) → 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(l)

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ Na + _ H₂O → _ NaOH + _ H₂

Which salt is produced by the neutralization of potassium hydroxide with sulfuric acid?

Balance the following equation: UO₂(s) + HF(l) → UF₄(s) + H₂O(l)

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ Cr + _ H₂SO₄ → _ Cr₂(SO₄)₃ + _ H₂

What is the reducing agent in the following reaction? Mg + NiO₂ + 2H₂O → Mg(OH)₂ + Ni(OH)₂

Which of these chemical equations does not describe a redox reaction?

Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW₂ If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?

Which salt is produced by the neutralization of nitric acid with calcium hydroxide?

Balance the following equation for the combustion of benzene: C₆H₆(l) + O₂(g) → H₂O(g) + CO₂(g)

If aqueous solutions of Mg(C₂H₃O₂)₂ and LiOH are mixed, which insoluble precipitate is formed?

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ Al₄C₃ + _ H₂O → _ Al(OH)₃ + _ CH₄

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ CH₄ + _ Cl₂ → _ CCl₄ + _ HCl

What is the coefficient of O₂ when the following equation is properly balanced with the smallest set of whole numbers? C₂H₄ + O₂ → CO₂ + H₂O

Atoms and Elements

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

The Mole and Chemical Formulas

Molecular Shape

Solids, Liquids, and Phase Changes

Gases

Physical Properties of Solutions

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

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Nuclear Chemistry

Electrochemistry

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Exam 10: Chemical Reactions and Chemical Equations

Based on the solubility rules, which of these processes will occur when solutions of ZnSO4(aq) and MgCl2(aq) are mixed?

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 → __ CO2 + __ H2O

In the reaction 5H2O2 + 2MnO4− + 6H+ → 2Mn2+ + 8H2O + 5O2, what is the oxidizing agent?

Which of these equations does not represent an oxidation-reduction reaction?

Balance the following equation: B2O3(s) + HF(l) → BF3(g) + H2O(l)

Which chemical equation describes a combustion reaction?

What is the reducing agent in the following reaction? 5Fe2+(aq) + MnO4−(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l)

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Na + ___ H2O → ___ NaOH + ___ H2

Which salt is produced by the neutralization of potassium hydroxide with sulfuric acid?

Balance the following equation: UO2(s) + HF(l) → UF4(s) + H2O(l)

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ Cr + ___ H2SO4 → ___ Cr2(SO4)3 + ___ H2

What is the reducing agent in the following reaction? Mg + NiO2 + 2H2O → Mg(OH)2 + Ni(OH)2

Which of these chemical equations does not describe a redox reaction?

Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW2 If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?

Which salt is produced by the neutralization of nitric acid with calcium hydroxide?

Balance the following equation for the combustion of benzene: C6H6(l) + O2(g) → H2O(g) + CO2(g)

If aqueous solutions of Mg(C2H3O2)2 and LiOH are mixed, which insoluble precipitate is formed?

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Al4C3 + ___ H2O → ___ Al(OH)3 + ___ CH4

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) ___ CH4 + ___ Cl2 → ___ CCl4 + ___ HCl

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? __ C2H4 + __ O2 → __ CO2 + __ H2O

Atoms and Elements

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

The Mole and Chemical Formulas

Molecular Shape

Solids, Liquids, and Phase Changes

Gases

Physical Properties of Solutions

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

Biochemistry

Nuclear Chemistry

Electrochemistry

Filters

Based on the solubility rules, which of these processes will occur when solutions of ZnSO₄(aq) and MgCl₂(aq) are mixed?

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ → CO₂ + H₂O

In the reaction 5H₂O₂ + 2MnO₄⁻ + 6H⁺ → 2Mn²⁺ + 8H₂O + 5O₂, what is the oxidizing agent?

Balance the following equation: B₂O₃(s) + HF(l) → BF₃(g) + H₂O(l)

What is the reducing agent in the following reaction? 5Fe²⁺(aq) + MnO₄⁻(aq) + 8H⁺(aq) → 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(l)

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ Na + _ H₂O → _ NaOH + _ H₂

Balance the following equation: UO₂(s) + HF(l) → UF₄(s) + H₂O(l)

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ Cr + _ H₂SO₄ → _ Cr₂(SO₄)₃ + _ H₂

What is the reducing agent in the following reaction? Mg + NiO₂ + 2H₂O → Mg(OH)₂ + Ni(OH)₂

Suppose white atoms (W) and black atoms (B) react according to the following balanced chemical equation. 2W + B → BW₂ If the initial reaction mixture is prepared as follows, what will the final reaction mixture be once the reaction is complete?

Balance the following equation for the combustion of benzene: C₆H₆(l) + O₂(g) → H₂O(g) + CO₂(g)

If aqueous solutions of Mg(C₂H₃O₂)₂ and LiOH are mixed, which insoluble precipitate is formed?

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? _ Al₄C₃ + _ H₂O → _ Al(OH)₃ + _ CH₄

Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) _ CH₄ + _ Cl₂ → _ CCl₄ + _ HCl

What is the coefficient of O₂ when the following equation is properly balanced with the smallest set of whole numbers? C₂H₄ + O₂ → CO₂ + H₂O