Question 1

What is the oxidation number of Cr in Cr2O72−?

Accepted Answer

A) −12 
B) −7 
C) −2 
D) +6 
E) +7 
A) −12 
B) −7 
C) −2 
D) +6 
E) +7

Question 2

Suppose aqueous solutions of silver(I) nitrate and potassium chloride are mixed.Which represents the likely result?

Accepted Answer

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

Question 3

What is reduced in the following reaction? Cu(NO3)2 + Zn → Zn(NO3)2 + Cu

Accepted Answer

A) Cu(NO3)2 
B) N 
C) O 
D) Zn 
E) NO3 
A) Cu(NO3)2 
B) N 
C) O 
D) Zn 
E) NO3

Question 4

What is the oxidizing 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 5

Which element is reduced in the following reaction? Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O

Accepted Answer

A) Cu 
B) H 
C) S 
D) O 
E) H2O 
A) Cu 
B) H 
C) S 
D) O 
E) H2O

Question 6

Balance the following equation: Ca3(PO4)2(s) + SiO2(s) + C(s) → CaSiO3(s) + CO(g) + P4(s)

Accepted Answer

A) Ca3(PO4)2(s) + 3SiO2(s) + 8C(s) → 3CaSiO3(s) + 8CO(g) + P4(s) 
B) Ca3(PO4)2(s) + 3SiO2(s) + 14C(s) → 3CaSiO3(s) + 14CO(g) + P4(s) 
C) Ca3(PO4)2(s) + 3SiO2(s) + 8C(s) → 3CaSiO3(s) + 8CO(g) + 2P4(s) 
D) 2Ca3(PO4)2(s) + 6SiO2(s) + 10C(s) → 6CaSiO3(s) + 10CO(g) + P4(s) 
E) 2Ca3(PO4)2(s) + 6SiO2(s) + 10C(s) → 6CaSiO3(s) + 10CO(g) + 4P4(s) 
A) Ca3(PO4)2(s) + 3SiO2(s) + 8C(s) → 3CaSiO3(s) + 8CO(g) + P4(s) 
B) Ca3(PO4)2(s) + 3SiO2(s) + 14C(s) → 3CaSiO3(s) + 14CO(g) + P4(s) 
C) Ca3(PO4)2(s) + 3SiO2(s) + 8C(s) → 3CaSiO3(s) + 8CO(g) + 2P4(s) 
D) 2Ca3(PO4)2(s) + 6SiO2(s) + 10C(s) → 6CaSiO3(s) + 10CO(g) + P4(s) 
E) 2Ca3(PO4)2(s) + 6SiO2(s) + 10C(s) → 6CaSiO3(s) + 10CO(g) + 4P4(s)

Question 7

Which of these chemical equations describes a precipitation reaction?

Accepted Answer

A) 2H2(g) + O2(g) → 2H2O(l) 
B) CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g) 
C) 2KNO3(s) → 2KNO2(s) + O2(g) 
D) 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l) 
E) 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) 
A) 2H2(g) + O2(g) → 2H2O(l) 
B) CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g) 
C) 2KNO3(s) → 2KNO2(s) + O2(g) 
D) 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l) 
E) 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)

Question 8

Which of these chemical equations describes a metal displacement reaction?

Accepted Answer

A) 2NaN3(s) → 2Na(s) + 3N2(g) 
B) Fe2O3(s) + 2Al(s) → 2Fe(s) + Al2O3(s) 
C) 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) 
D) 2P(s) + 3Cl2(g) → 2PCl3(g) 
E) 2ZnS(s) + 3O2(g) → 2ZnO(s) + 2SO2(g) 
A) 2NaN3(s) → 2Na(s) + 3N2(g) 
B) Fe2O3(s) + 2Al(s) → 2Fe(s) + Al2O3(s) 
C) 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) 
D) 2P(s) + 3Cl2(g) → 2PCl3(g) 
E) 2ZnS(s) + 3O2(g) → 2ZnO(s) + 2SO2(g)

Question 9

What is the oxidation number of N in K3Fe(CN)6?

Accepted Answer

A) +3 
B) −3 
C) +4 
D) −5 
E) +1 
A) +3 
B) −3 
C) +4 
D) −5 
E) +1

Question 10

If aqueous solutions of Ba(OH)2 and HNO3 are mixed, what products are formed?

Accepted Answer

A) BaN2(s) + H2O(l) 
B) Ba(NO3)2(aq) + H2O(l) 
C) Ba(s) + H2(g) + NO2(g) 
D) Ba2O(s) + NO2(g) + H2O(l) 
E) Ba3N2(s) + H2O(l) 
A) BaN2(s) + H2O(l) 
B) Ba(NO3)2(aq) + H2O(l) 
C) Ba(s) + H2(g) + NO2(g) 
D) Ba2O(s) + NO2(g) + H2O(l) 
E) Ba3N2(s) + H2O(l)

Question 11

What is the oxidation number of sulfur in sulfuric acid?

Accepted Answer

A) +1 
B) +6 
C) −2 
D) −4 
E) +4 
A) +1 
B) +6 
C) −2 
D) −4 
E) +4

Question 12

Based on the solubility rules, which of these processes will occur if solutions of CuSO4(aq) and BaCl2(aq) are mixed?

Accepted Answer

A) CuCl2 will precipitate; Ba2+ and SO42− are spectator ions. 
B) CuSO4 will precipitate; Ba2+ and Cl− are spectator ions. 
C) BaSO4 will precipitate; Cu2+ and Cl− are spectator ions. 
D) BaCl2 will precipitate; Cu2+ and SO42− are spectator ions. 
E) No precipitate will form. 
A) CuCl2 will precipitate; Ba2+ and SO42− are spectator ions. 
B) CuSO4 will precipitate; Ba2+ and Cl− are spectator ions. 
C) BaSO4 will precipitate; Cu2+ and Cl− are spectator ions. 
D) BaCl2 will precipitate; Cu2+ and SO42− are spectator ions. 
E) No precipitate will form.

Question 13

Balance the following equation: C8H18O3(l) + O2(g) → H2O(g) + CO2(g)

Accepted Answer

A) C8H18O3(l) + 8O2(g) → 9H2O(g) + 8CO2(g) 
B) C8H18O3(l) + 11O2(g) → 9H2O(g) + 8CO2(g) 
C) 2C8H18O3(l) + 22O2(g) → 9H2O(g) + 16CO2(g) 
D) C8H18O3(l) + 13O2(g) → 18H2O(g) + 8CO2(g) 
E) 2C8H18O3(l) + 17O2(g) → 18H2O(g) + 16CO2(g) 
A) C8H18O3(l) + 8O2(g) → 9H2O(g) + 8CO2(g) 
B) C8H18O3(l) + 11O2(g) → 9H2O(g) + 8CO2(g) 
C) 2C8H18O3(l) + 22O2(g) → 9H2O(g) + 16CO2(g) 
D) C8H18O3(l) + 13O2(g) → 18H2O(g) + 8CO2(g) 
E) 2C8H18O3(l) + 17O2(g) → 18H2O(g) + 16CO2(g)

Question 14

Which salt is formed in the neutralization reaction of hydrochloric acid with calcium hydroxide?

Accepted Answer

A) CaO 
B) CaCl 
C) CaH2 
D) CaCl2 
E) NaCl 
A) CaO 
B) CaCl 
C) CaH2 
D) CaCl2 
E) NaCl

Question 15

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

Accepted Answer

A) Na2SO4 
B) Na2(SO4)3 
C) Na(SO4)2 
D) Na2SO3 
E) Na2S 
A) Na2SO4 
B) Na2(SO4)3 
C) Na(SO4)2 
D) Na2SO3 
E) Na2S

Question 16

What is the net ionic equation if sodium sulfate is mixed with barium hydroxide?

Accepted Answer

A) 2Na+(aq) + SO42−(aq) → Na2SO4(s) 
B) Na+(aq) + OH−(aq) → NaOH(s) 
C) 2Ba+(aq) + SO42− (aq) → Ba2SO4(s) 
D) Ba2+(aq) + SO42− (aq) → BaSO4(s) 
E) Ba2+(aq) + 2OH−(aq) → Ba(OH)2(s) 
A) 2Na+(aq) + SO42−(aq) → Na2SO4(s) 
B) Na+(aq) + OH−(aq) → NaOH(s) 
C) 2Ba+(aq) + SO42− (aq) → Ba2SO4(s) 
D) Ba2+(aq) + SO42− (aq) → BaSO4(s) 
E) Ba2+(aq) + 2OH−(aq) → Ba(OH)2(s)

Question 17

If aqueous solutions of ammonium sulfide and copper(II) nitrate are mixed, which insoluble precipitate is formed?

Accepted Answer

A) CuS 
B) Cu2S 
C) NH4NO3 
D) NH4(NO3)2 
E) CuSO4 
A) CuS 
B) Cu2S 
C) NH4NO3 
D) NH4(NO3)2 
E) CuSO4

Question 18

Identify the reducing agent in the chemical reaction Cd + NiO2 + 2H2O → Cd(OH)2 + Ni(OH)2

Accepted Answer

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

Question 19

Which is a representation of a balanced chemical equation for the reaction of nitrogen gas and chlorine gas to form nitrogen trichloride?

Accepted Answer

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

Question 20

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.) ___ Al + ___ H2SO4 → ___ Al2(SO4)3 + ___ H2

Accepted Answer

A) 3 
B) 5 
C) 6 
D) 9 
E) 12 
A) 3 
B) 5 
C) 6 
D) 9 
E) 12

What is the oxidation number of Cr in Cr₂O₇²⁻?

Suppose aqueous solutions of silver(I) nitrate and potassium chloride are mixed.Which represents the likely result?

What is reduced in the following reaction? Cu(NO₃)₂ + Zn → Zn(NO₃)₂ + Cu

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

Which element is reduced in the following reaction? Cu + 2H₂SO₄ → CuSO₄ + SO₂ + 2H₂O

Balance the following equation: Ca₃(PO₄)₂(s) + SiO₂(s) + C(s) → CaSiO₃(s) + CO(g) + P₄(s)

Which of these chemical equations describes a precipitation reaction?

Which of these chemical equations describes a metal displacement reaction?

What is the oxidation number of N in K₃Fe(CN)₆?

If aqueous solutions of Ba(OH)₂ and HNO₃ are mixed, what products are formed?

What is the oxidation number of sulfur in sulfuric acid?

Based on the solubility rules, which of these processes will occur if solutions of CuSO₄(aq) and BaCl₂(aq) are mixed?

Balance the following equation: C₈H₁₈O₃(l) + O₂(g) → H₂O(g) + CO₂(g)

Which salt is formed in the neutralization reaction of hydrochloric acid with calcium hydroxide?

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

What is the net ionic equation if sodium sulfate is mixed with barium hydroxide?

If aqueous solutions of ammonium sulfide and copper(II) nitrate are mixed, which insoluble precipitate is formed?

Identify the reducing agent in the chemical reaction Cd + NiO₂ + 2H₂O → Cd(OH)₂ + Ni(OH)₂

Which is a representation of a balanced chemical equation for the reaction of nitrogen gas and chlorine gas to form nitrogen trichloride?

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.) _ Al + _ H₂SO₄ → _ Al₂(SO₄)₃ + _ H₂

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

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Exam 10: Chemical Reactions and Chemical Equations

What is the oxidation number of Cr in Cr2O72−?

Suppose aqueous solutions of silver(I) nitrate and potassium chloride are mixed.Which represents the likely result?

What is reduced in the following reaction? Cu(NO3)2 + Zn → Zn(NO3)2 + Cu

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

Which element is reduced in the following reaction? Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O

Balance the following equation: Ca3(PO4)2(s) + SiO2(s) + C(s) → CaSiO3(s) + CO(g) + P4(s)

Which of these chemical equations describes a precipitation reaction?

Which of these chemical equations describes a metal displacement reaction?

What is the oxidation number of N in K3Fe(CN)6?

If aqueous solutions of Ba(OH)2 and HNO3 are mixed, what products are formed?

What is the oxidation number of sulfur in sulfuric acid?

Based on the solubility rules, which of these processes will occur if solutions of CuSO4(aq) and BaCl2(aq) are mixed?

Balance the following equation: C8H18O3(l) + O2(g) → H2O(g) + CO2(g)

Which salt is formed in the neutralization reaction of hydrochloric acid with calcium hydroxide?

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

What is the net ionic equation if sodium sulfate is mixed with barium hydroxide?

If aqueous solutions of ammonium sulfide and copper(II) nitrate are mixed, which insoluble precipitate is formed?

Identify the reducing agent in the chemical reaction Cd + NiO2 + 2H2O → Cd(OH)2 + Ni(OH)2

Which is a representation of a balanced chemical equation for the reaction of nitrogen gas and chlorine gas to form nitrogen trichloride?

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.) ___ Al + ___ H2SO4 → ___ Al2(SO4)3 + ___ H2

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

What is the oxidation number of Cr in Cr₂O₇²⁻?

What is reduced in the following reaction? Cu(NO₃)₂ + Zn → Zn(NO₃)₂ + Cu

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

Which element is reduced in the following reaction? Cu + 2H₂SO₄ → CuSO₄ + SO₂ + 2H₂O

Balance the following equation: Ca₃(PO₄)₂(s) + SiO₂(s) + C(s) → CaSiO₃(s) + CO(g) + P₄(s)

What is the oxidation number of N in K₃Fe(CN)₆?

If aqueous solutions of Ba(OH)₂ and HNO₃ are mixed, what products are formed?

Based on the solubility rules, which of these processes will occur if solutions of CuSO₄(aq) and BaCl₂(aq) are mixed?

Balance the following equation: C₈H₁₈O₃(l) + O₂(g) → H₂O(g) + CO₂(g)

Identify the reducing agent in the chemical reaction Cd + NiO₂ + 2H₂O → Cd(OH)₂ + Ni(OH)₂

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.) _ Al + _ H₂SO₄ → _ Al₂(SO₄)₃ + _ H₂