Deck 10: Chemical Reactions and Chemical Equations

Question 1

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

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

Answer 1

9

Question 2

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

Answer 2

2C₆H₆(l) + 15O₂(g) → 6H₂O(g) + 12CO₂(g)

Question 3

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

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

Answer 3

26

Question 4

Balance the following equation: B₂O₃(s) + HF(l) → BF₃(g) + H₂O(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 5

What is the coefficient of H₂O when the following equation is properly balanced with the smallest set of whole numbers? ___ PCl₃(l) + ___ H₂O(l) → ___ H₃PO₃(aq) + ___ HCl(aq)

A)1
B)2
C)3
D)5
E)None of these answers is correct.

Question 6

When the following equation is balanced with smallest whole number integers, what is the coefficient for HNO₃?

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

Question 7

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

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

Question 8

Balance the following equation: UO₂(s) + HF(l) → UF₄(s) + H₂O(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 9

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

A)
B)
C)
D)

Question 10

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

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

Question 11

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers.What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? ___ C₇H₁₄ + ___ O₂ → ___ CO₂ + ___ H₂O

A)42
B)21
C)11
D)10
E)None of these answers is correct.

Question 12

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

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

Question 13

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? ___ Ca₃(PO₄)₂ + ___ H₂SO₄ → ___ CaSO₄ + ___ H₃PO₄

A)3
B)8
C)10
D)11
E)None of these answers is correct.

Question 14

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

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

Question 15

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

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

Question 16

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?

A)
B)
C)
D)
E)

Question 17

Balance the following equation: C₈H₁₈O₃(l) + O₂(g) → H₂O(g) + CO₂(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 18

What is the coefficient of O₂ when the following equation is properly balanced with the smallest set of whole numbers? ___ CH₃OH + ___ O₂ → ___ CO₂ + ___ H₂O

A)1
B)2
C)3
D)7
E)None of these answers is correct.

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.) __ SF₄ + __ H₂O → __ H₂SO₃ + __ HF

A)4
B)6
C)7
D)9
E)None of these answers is correct.

Question 20

Balance the following equation: Ca₃(PO₄)₂(s) + SiO₂(s) + C(s) → CaSiO₃(s) + CO(g) + P₄(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 21

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

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 22

If aqueous solutions of KMnO₄, FeSO₄ and H₂SO_4, are mixed, which ions are spectator ions? 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq) → K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄)₃(aq) + 8H₂O(l)

A)only K⁺
B)only SO₄²⁻
C)only K⁺ and SO₄²⁻
D)only K⁺, SO₄²⁻_, and Fe²⁺
E)only K⁺, SO₄²⁻, Fe²⁺, and Mn²⁺

Question 23

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

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

Question 24

If aqueous solutions of lead(II) nitrate and sodium sulfate, which insoluble precipitate is formed?

A)NaNO₃
B)Na₂NO₃
C)PbSO₄
D)Pb₂SO₄
E)PbS

Question 25

Which chemical equation describes a combustion reaction?

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 26

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

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 27

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

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 28

Which of these chemical equations describes a metal displacement reaction?

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 29

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

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 30

Which of these chemical equations describes a precipitation reaction?

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 31

If aqueous solutions of Pb(NO₃)₂ and NaCl are mixed, which ions, if any, are spectator ions? Pb(NO₃)₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaNO₃(aq)

A)Pb²⁺(aq), Cl⁻(aq)
B)Na⁺(aq), NO₃⁻ (aq)
C)Pb²⁺(aq), NO₃⁻(aq)
D)Na⁺(aq), Cl⁻(aq)
E)None are spectator ions.

Question 32

Which chemical equation describes an acid-base neutralization reaction?

A)2Al(s)+ 3H₂SO₄(aq) → Al₂ (SO₄)₃ (aq) + 3H₂(g)
B)2SO₂(g) + 2H₂O(l) + O₂(g) → 2H₂SO₄(aq)
C)LiOH(aq) + HNO₃(aq) → LiNO₃(aq) + H₂O(l)
D)2KBr(aq) + Cl₂(g) → 2KCl(aq) + Br₂(l)
E)CaBr₂(aq) + H₂SO₄(aq) → CaSO₄(s) + 2HBr(g)

Question 33

Which balanced chemical equation could represent the following result of a precipitation reaction?

A)2K₃PO₄(aq) + 3Cr₂(SO₄)₃(aq) → CrPO₄(s) + 6KCl(aq)
B)MgSO₄(aq) + 2AgNO₃(aq) → Ag₂SO₄(s) + Mg(NO₃)₂(aq)
C)MgCl₂(aq) + 2AgC₂H₃O₂(aq) → 2AgCl(s) + Mg(C₂H₃O₂)₂(aq)
D)K₂CrO₄(aq) + 2AgNO₃(aq) → Ag₂CrO₄(s) + 2KNO₃(aq)
E)K₂S(aq) + Pb(NO₃)₂(aq) → PbS(s) + 2KNO₃(aq)

Question 34

If aqueous solutions of Na₂CO₃ and BaCl₂ are mixed, which insoluble precipitate is formed?

A)Ba₂CO₃
B)BaCO₃
C)NaCl
D)NaCl₂
E)BaO

Question 35

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

A)CaO
B)CaCl
C)CaH₂
D)CaCl₂
E)NaCl

Question 36

What is the net ionic equation for the reaction that occurs when aqueous solutions of Pb(NO₃)₂ and NH₄Cl are mixed?

A)Pb(NO₃)₂(aq) + 2NH₄Cl(aq) ? 2NH₄NO₃(aq) + PbCl₂(s)
B)Pb₂⁺(aq) + 2Cl^?(aq) ? PbCl₂(s)
C)Pb₂⁺(aq) + 2NO₃^?(aq) + 2NH₄⁺(aq) + 2Cl^?(aq) ? 2NH₄⁺(aq) + 2NO₃^?(aq) + PbCl₂(s)
D)NH₄⁺(aq) + NO₃^?(aq) ? NH₄NO₃(s)
E)NH₄⁺(aq) + NO₃^?(aq) ? 2NO(g) + 2H₂O(l)

Question 37

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

A)
B)
C)
D)

Question 38

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

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

Question 39

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

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 40

Identify the net ionic equation for the following reaction: 2NaCl(aq) + Hg₂(NO₃)₂(aq) → 2NaNO₃(aq) + Hg₂Cl₂(s)

A)Na⁺(aq) + NO₃⁻ (aq) → NaNO₃(aq)
B)Hg₂²⁺(aq) + 2Cl⁻(aq) → Hg₂Cl₂(s)
C)2Hg⁺(aq) + 2Cl⁻(aq) → 2HgCl(s)
D)Hg₂(NO₃)₂(aq) → Hg₂²⁺(aq) + 2NO₃⁻(aq)
E)Hg₂²⁺(aq) → Hg₂(s)

Question 41

What is the oxidation number of iodine in I₂?

A)−1
B)0
C)+1
D)+7
E)−7

Question 42

What is oxidized in the following reaction? Fe + Ag₂O → FeO + 2Ag

A)Ag
B)Ag₂O
C)Fe
D)FeO
E)2Ag

Question 43

Select the compound in which sulfur has its highest possible oxidation number.

A)H₂S
B)SO₂
C)SCl₂
D)H₂SO₃
E)Na₂SO₄

Question 44

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

A)Cu(NO₃)₂
B)N
C)O
D)Zn
E)NO₃

Question 45

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

A)Fe²⁺
B)MnO₄⁻
C)H⁺
D)Mn²⁺
E)Fe³⁺

Question 46

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

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 47

Which of the following equations is not a redox reaction?

A)2H₂(g) + O₂(g) → 2H₂O(l)
B)Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g)
C)H₂O(l) + NH₃(g) → NH₄⁺(aq) + OH⁻(aq)
D)6FeSO₄(aq) + K₂Cr₂O₇(aq) + 7H₂SO₄(aq) → Cr₂(SO₄)₃(aq) + 3Fe₂(SO₄)₃(aq) + K₂SO₄(aq) + 7H₂O(l)
E)Cl₂(g) + 2KBr(aq) → Br₂(l) + 2KCl(aq)

Question 48

Which salt is produced by the neutralization of hydrobromic acid with magnesium hydroxide?

A)MgBr
B)Mg₂Br₃
C)MgBr₂
D)Mg₃Br₂
E)Mg₂Br

Question 49

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

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

Question 50

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

A)Mg
B)NiO₂
C)H₂O
D)Mg(OH)₂
E)Ni(OH)₂

Question 51

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

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

Question 52

Which is the net ionic equation for the reaction between aqueous solutions of lithium hydroxide and hydrobromic acid? LiOH(aq) + HBr(aq) → H₂O(l) + LiBr(aq)

A)LiOH(aq) → Li⁺(aq) + OH⁻(aq)
B)HBr(aq) → H⁺(aq) + Br⁻(aq)
C)H⁺(aq) + OH⁻(aq) → H₂O(l)
D)Li⁺(aq) + Br⁻(aq) → LiBr(aq)
E)Li⁺(aq) + OH⁻(aq)+ H⁺(aq) + Br⁻(aq) → H₂O(l) + LiBr(aq)

Question 53

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

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

Question 54

Which equation describes a redox reaction?

A)2Al(s) + 3H₂SO₄(aq) → Al₂(SO₄)₃(aq) + 3H₂(g)
B)2KBr(aq) + Pb(NO₃)₂(aq) → 2KNO₃(aq) + PbBr₂(s)
C)CaBr₂(aq) + H₂SO₄(aq) → CaSO₄(s) + 2HBr(g)
D)H⁺(aq) + OH⁻(aq) → H₂O(l)
E)CO₃²⁻(aq) + HSO₄⁻(aq) → HCO₃⁻(aq) + SO₄²⁻(aq)

Question 55

What is the oxidation number of N in N₂H₄?

A)+4
B)+2
C)−2
D)−4
E)0

Question 56

What is the oxidation number of oxygen in KMnO₄?

A)+1
B)−8
C)+5
D)−2
E)+3

Question 57

What is the oxidation number of sulfur in sulfuric acid?

A)+1
B)+6
C)−2
D)−4
E)+4

Question 58

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

A)+3
B)−3
C)+4
D)−5
E)+1

Question 59

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

A)H₂O₂
B)MnO₄⁻
C)H⁺
D)Mn²⁺
E)O₂

Question 60

What is the oxidation number of Cr in Cr₂O₇²⁻?

A)−12
B)−7
C)−2
D)+6
E)+7

Question 61

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

A)Cd
B)NiO₂
C)H₂O
D)Cd(OH)₂
E)Ni(OH)₂

Question 62

Identify the oxidizing agent in the chemical reaction 2MnO₄⁻ + 5H₂SO₃→ 2Mn²⁺ + 5SO₄²⁻ + 4H⁺ + 3H₂O.

A)MnO₄⁻
B)H₂SO₃
C)Mn²⁺
D)SO₄²⁻
E)H⁺

Question 63

Which is a correct description of the following reaction? H₂SO₄ + Cd(OH)₂ → 2H₂O + CdSO₄

A)This reaction is an acid-base reaction.
B)In this reaction, hydrogen is oxidized.
C)In this reaction, sulfur is oxidized.
D)In this reaction, cadmium is oxidized.
E)In this reaction, oxygen is oxidized.

Question 64

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

A)Cu
B)H
C)S
D)O
E)H₂O

Question 65

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

A)Fe²⁺
B)MnO₄⁻
C)H⁺
D)Mn²⁺
E)Fe³⁺