Deck 4: Chemical Reactions and Stoichiometry

Question 1

What element is being oxidized in the following (unbalanced) redox reaction? MnO₄⁻ (aq) + H₂C₂O₄(aq) → Mn²⁺(aq) + CO₂(g)

A) C
B) O
C) Mn
D) H

Answer 1

C

Question 2

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Cd and Ag⁺ in the balanced reaction? Cd(s) + Ag⁺(aq) → Ag(s) + Cd²⁺(aq)

A) Cd = 1, Ag⁺ = 2
B) Cd = 1, Ag⁺ = 1
C) Cd = 2, Ag⁺ = 1
D) Cd = 2, Ag⁺ = 2
E) Cd = 3, Ag⁺ = 1

Answer 2

Cd = 1, Ag⁺ = 2

Question 3

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Zn and H⁺ in the balanced reaction? Zn²⁺(aq) + NH₄⁺(aq) → Zn(s) + NO₃⁻(aq)

A) Zn = 1, H⁺ = 8
B) Zn = 1, H⁺ = 4
C) Zn = 4, H⁺ = 10
D) Zn = 2, H⁺ = 4
E) Zn = 3, H⁺ = 5

Answer 3

Zn = 4, H⁺ = 10

Question 4

Identify the location of oxidation in an electrochemical cell.

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

Question 5

Identify the location of reduction in an electrochemical cell.

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

Question 6

What element is being reduced in the following (unbalanced) redox reaction? H₂O₂(l) + ClO₂(aq) → ClO₂⁻(aq) + O₂(g)

A) H
B) O
C) Cl
D) N
E) C

Question 7

What element is being oxidized in the following (unbalanced) redox reaction? Cr(OH)₄⁻(aq) + ClO⁻(aq) → CrO₄^2-(aq) + Cl⁻(aq)

A) Cr
B) O
C) H
D) Cl

Question 8

Define a salt bridge.

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 9

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H⁺ and Fe³⁺ in the balanced reaction? Fe²⁺(aq) + MnO₄⁻(aq) → Fe³⁺(aq) + Mn²⁺(aq)

A) H⁺ = 2, Fe³⁺ = 3
B) H⁺ = 8, Fe³⁺ = 5
C) H⁺ = 3, Fe³⁺ = 2
D) H⁺ = 5, Fe³⁺ = 1
E) H⁺ = 8, Fe³⁺ = 1

Question 10

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H₂C₂O₄ and H₂O in the balanced reaction? MnO₄⁻ (aq) + H₂C₂O₄(aq) → Mn²⁺(aq) + CO₂(g)

A) H₂C₂O₄ = 5, H₂O = 8
B) H₂C₂O₄ = 1, H₂O = 1
C) H₂C₂O₄ = 5, H₂O = 1
D) H₂C₂O₄ = 1, H₂O = 4
E) H₂C₂O₄ = 3, H₂O = 2

Question 11

What element is being oxidized in the following (unbalanced) redox reaction? H₂O₂(l) + ClO₂(aq) → ClO₂⁻(aq) + O₂(g)

A) H
B) O
C) Cl
D) N
E) C

Question 12

What element is being reduced in the following (unbalanced) redox reaction? MnO₄⁻ (aq) + H₂C₂O₄(aq) → Mn²⁺(aq) + CO₂(g)

A) C
B) O
C) Mn
D) H

Question 13

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

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

Question 14

Which one of the following is the best electrolyte?

A) C₁₂H₂₂O₁₁(aq)
B) NaCl(aq)
C) AgCl(aq)
D) CaSO₄(aq)
E) CH₃COOH(aq)

Question 15

Which of the following statements is TRUE?

A) A reduction process corresponds to an increase in oxidation state as a result of loss of electrons.
B) An oxidation process involves the loss of electrons resulting in an increase in oxidation state.
C) An oxidation process corresponds to a decrease in oxidation state as a result of a gain of electrons.
D) During a reduction process electrons are lost, while during an oxidation they are gained.
E) During a reduction process an oxidation state increases, while in an oxidation process an oxidation state decreases.

Question 16

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Mg(s) + Al³⁺(aq) → Al(s) + Mg²⁺(aq)

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

Question 17

Which of the following statements is TRUE?

A) Electrolytes conduct electricity.
B) Strong acids are weak electrolytes.
C) Weak acids completely ionize in water.
D) Sugar solution conducts electricity.
E) AgNO₃ is insoluble in water.

Question 18

What element is being reduced in the following (unbalanced) redox reaction? Cr(OH)₄⁻(aq) + ClO⁻(aq) → CrO₄^2-(aq) + Cl⁻(aq)

A) Cr
B) O
C) H
D) Cl

Question 19

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Br₂ and OH⁻ in the balanced reaction? Br₂(l) → BrO₃⁻(aq) + Br⁻(aq)

A) Br₂ = 1, OH⁻ = 2
B) Br₂ = 2, OH⁻ = 5
C) Br₂ = 3, OH⁻ = 3
D) Br₂ = 3, OH⁻ = 6
E) Br₂ = 1, OH⁻ = 6

Question 20

A homogeneous mixture of two substances is known as ________.

A) a solute
B) a solvent
C) a solution
D) solute-solute interactions
E) solvent-solvent interactions

Question 21

Which of the following is considered a strong electrolyte?

A) NH₄NO₃
B) C₁₂H₂₂O₁₁
C) PbCl₂
D) HC₂H₃O₂
E) CH₃OH

Question 22

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) → CrO₄^2-(aq) + Cl⁻(aq)

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 23

What are the required coefficients to properly balance the following chemical reaction? CH₄(g) + H₂O(g) → CO(g) + H₂(g)

A) 1, 2, 2, 3
B) 1, 1, 2, 2
C) 2, 1, 1, 3
D) 2, 2, 1, 1
E) 1, 1, 1, 3

Question 24

Which of the following describes sugar?

A) strong electrolyte, weak acid
B) weak electrolyte, weak acid
C) strong electrolyte, strong acid
D) weak electrolyte, strong acid
E) nonelectrolyte

Question 25

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

A) 4, 6, 4,
B) 4, 6, 4, 5
C) 2, 3, 2, 2
D) 2, 3, 2, 3
E) 4, 4, 6, 6

Question 26

Which of the following describes HCl?

A) strong electrolyte, weak acid
B) weak electrolyte, weak acid
C) strong electrolyte, strong acid
D) weak electrolyte, strong acid
E) nonelectrolyte

Question 27

What are the required coefficients to properly balance the following chemical reaction? C₆H₁₂O₆(s) + O₂(g) → CO₂(g) + H₂O(l)

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

Question 28

What are the required coefficients to properly balance the following chemical reaction? SO₂(g) + O₂(g) + H₂O(l) → H₂SO₄(aq)

A) 1, 1, 1, 1
B) 1, 2, 1, 2
C) 1, 2, 2, 1
D) 2, 1, 2, 2
E) 2, 1, 1, 2

Question 29

What are the required coefficients to properly balance the following chemical reaction? PbS(s) + HBr(aq) → PbBr₂(s) + H₂S(g)

A) 1, 1, 2, 2
B) 1, 2, 1, 1
C) 1, 2, 2, 1
D) 2, 1, 1, 1
E) 2, 2, 1, 2

Question 30

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

A) 1, 1, 2
B) 2, 2,
C) 1, 1, 1
D) 2, 1, 2
E) 1, 2, 1

Question 31

Identify the balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapour.

A) 2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(g)
B) C₂H₆(g) + 5O(g) → 2CO(g) + 3H₂O(g)
C) 2C₂H₆(g) + 5O₂(g) → 4CO(g) + 6H₂O(g)
D) C₂H₆(g) + 7O(g) → 2CO₂(g) + 3H₂O(g)
E) 2CH₃(g) + 5O(g) → 2CO(g) + 3H₂O(g)

Question 32

What are the required coefficients to properly balance the following chemical reaction? Cu(s) + S(s) → Cu₂S(s)

A) 1, 1,
B) 1, 1, 1
C) 1, 1, 2
D) 2, 1, 1
E) 2, 1, 2

Question 33

What are the required coefficients to properly balance the following chemical reaction? MnCl₂(s) + H₂O(l) + Cl₂(g) → HCl(aq) + MnO₂(s)

A) 1, 2, 1, 4, 1
B) 2, 2, 1, 4, 2
C) 1, 1, 1, 2, 1
D) 1, 1, 1, 4, 1
E) 2, 1, 1, 4, 2

Question 34

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Al and F₂ in the balanced reaction? Al(s) + F₂(g) → Al³⁺(aq) + F^-(aq)

A) Al = 2, F₂ = 3
B) Al = 2, F₂ = 6
C) Al = 1, F₂ = 1
D) Al = 2, F₂ = 1
E) Al = 3, F₂ = 2

Question 35

What are the required coefficients to properly balance the following chemical reaction? Na(s) + H₂O(l) → H₂(g) + NaOH(aq)

A) 1, 2, 2, 1
B) 2, 2, 1, 1
C) 2, 1, 1, 1
D) 2, 1, 2, 1
E) 2, 2, 1, 2

Question 36

What are the required coefficients to properly balance the following chemical reaction? N₂H₄(l) → NH₃(g) + N₂(g)

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

Question 37

Identify the balanced equation to show the reaction of aqueous aluminum acetate with aqueous ammonium phosphate to form solid aluminum phosphate and aqueous ammonium acetate.

A) Al(C₂H₃O₂)₂(aq) + (NH₄)₂PO₄(aq) → AlPO₄(s) + 2NH₄C₂H₃O₂(aq)
B) Al(C₂H₃O₂)₂(aq) + (NH₃)₂PO₄(aq) → AlPO₄(s) + 2NH₃C₂H₃O₂(aq)
C) Al(CO₃)₂(aq) + (NH₃)₂PO₄(aq) → AlPO₄(s) + 2NH₃CO₃(aq)
D) Al(C₂H₃O₂)₃(aq) + (NH₄)₃PO₄(aq) → AlPO₄(s) + 3NH₄C₂H₃O₂(aq)
E) Al(CO₂)₃(aq) + (NH₄)₃PO₃(aq) → AlPO₃(s) + 3NH₄CO₂(aq)

Question 38

Identify the balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.

A) H₂SO₄(aq) + LiOH(aq) → H₂O(l) + Li₂SO₄(aq)
B) H₂SO₃(aq) + 2LiOH(aq) → 2H₂O(l) + Li₂SO₃(aq)
C) HSO₃(aq) + LiOH(aq) → H₂O(l) + LiSO₃(aq)
D) HSO₄(aq) + LiOH(aq) → H₂O(l) + LiSO₄(aq)
E) H₂S(aq) + 2LiOH(aq) → 2H₂O(l) + Li₂S(aq)

Question 39

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)

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 40

Which of the following is a weak electrolyte?

A) LiOH
B) CaCl₂
C) MgCO₃
D) NaC₂H₃O₂
E) Li₂SO₄

Question 41

How many of the following compounds are soluble in water? Cu(OH)₂ LiNO₃ NH₄Br K₂S

A) 0
B) 1
C) 2
D) 3
E) 4

Question 42

Which of the following compounds is insoluble in water?

A) Hg₂I₂
B) MgSO₄
C) (NH₄)₂CO₃
D) BaS
E) All of these compounds are soluble in water.

Question 43

Which of the following compounds is soluble in water?

A) CaCl₂
B) MgCO₃
C) PbCl₂
D) BaSO₄
E) None of these compounds is soluble in water.

Question 44

Which of the following statements is FALSE?

A) Aqueous reactions can be represented with a molecular equation.
B) Aqueous reactions can be represented with a complete ionic equation.
C) Aqueous reactions can be represented with a net ionic equation.
D) Precipitation reactions isoccur when two aqueous solutions are mixed a to form a solid precipitate.
E) Spectator ions change the course of the reaction and are included in the net ionic equation.

Question 45

Which of the following is a precipitation reaction?

A) 2HBr(aq) + NiS(s) → (aq) + S(g)
B) I(aq) + NaOH(aq) → O(l) + (g) + NaI(aq)
C) 2 (g) + 11 (g) → 8 (g) + 6 O(g)
D) 4NO(g) + 6 O(g) → 4 (g) + (g)
E) (aq) + (aq) → (s) + 2NaBr(aq)

Question 46

How many of the following compounds are insoluble in water? KC₂H₃O₂ CaSO₄ SrS AlPO₄

A) 0
B) 1
C) 2
D) 3
E) 4

Question 47

Choose the statement below that is TRUE.

A) A weak acid solution consists of mostly nonionized acid molecules.
B) The term "strong electrolyte" means that the substance is extremely reactive.
C) A strong acid solution consists of only partially ionized acid molecules.
D) The term "weak electrolyte" means that the substance is inert.
E) A molecular compound that does not ionize in solution is considered a strong electrolyte.

Question 48

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

A) 2H⁺(aq) + CO₃^2-(aq) → H₂CO₃(s)
B) 2Na⁺(aq) + CO₃^2-(aq) + 2H⁺(aq) + 2Cl^-(aq) → H₂CO₃(s) + 2NaCl(aq)
C) 2H⁺(aq) + CO₃^2-(aq) → H₂O(l) + CO₂(g)
D) 2Na⁺(aq) + CO₃^2-(aq) + 2H⁺(aq) + 2Cl^-(aq) → H₂CO₃(s) + 2Na⁺(aq) + 2Cl^-(aq)
E) No reaction occurs.

Question 49

Identify the spectator ions in the following molecular equation: KBr(aq) + AgNO₃(aq) → AgBr(s) + KNO₃(aq)

A) Ag⁺ and Br^-
B) K⁺ and NO₃^-
C) K⁺ and Br^-
D) Ag⁺ and NO₃^-
E) There are no spectator ions in this reaction.

Question 50

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

A) NH₄NO₃ + Li₂CO₃
B) Hg₂(NO₃)₂ + LiI
C) NaCl + Li₃PO₄
D) AgC₂H₃O₂ + Cu(NO₃)₂
E) None of the above solution pairs will produce a precipitate.

Question 51

Which of the following describes acetic acid?

A) strong electrolyte, weak acid
B) weak electrolyte, weak acid
C) strong electrolyte, strong acid
D) weak electrolyte, strong acid
E) nonelectrolyte

Question 52

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of H₂SO₄ and KOH are mixed.

A) H⁺(aq) + OH^-(aq) → H₂O(l)
B) 2K⁺(aq) + SO₄^2-(aq) → K₂SO₄(s)
C) H⁺(aq) + OH^-(aq) + 2K⁺(aq) + SO₄^2-(aq) → H₂O(l) + K₂SO₄(s)
D) H₂²⁺(aq) + OH^-(aq) → H₂(OH)₂(l)
E) No reaction occurs.

Question 53

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K₂S and Fe(NO₃)₂ are mixed.

A) K⁺(aq) + NO₃^-(aq) → KNO₃(s)
B) Fe²⁺(aq) + S^2-(aq) + 2K⁺(aq) + 2NO₃^-(aq) → FeS(s) + 2K⁺(aq) + 2NO₃^-(aq)
C) Fe²⁺(aq) + S^2-(aq) + 2K⁺(aq) + 2NO₃^-(aq) → Fe²⁺(aq) + S^2-(aq) + 2KNO₃(s)
D) Fe²⁺(aq) + S^2-(aq) → FeS(s)
E) No reaction occurs.

Question 54

What precipitate is most likely formed from a solution containing Ba²⁺, Na¹⁺, OH^1-, and CO₃^2-.

A) NaOH
B) BaCO₃
C) Na₂CO₃
D) Ba(OH)₂

Question 55

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

A) K₂CO₃ + NaCl
B) Na₂SO₄ + KOH
C) CaS + Na₂SO₄
D) None of these solution pairs will produce a precipitate.
E) All of these solution pairs will produce a precipitate.

Question 56

Identify the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper(II) nitrate are mixed.

A) Li⁺(aq) + SO₄^2-(aq) + Cu⁺(aq) + NO₃^-(aq) → CuS(s) + Li⁺(aq) + NO₃^-(aq)
B) Li⁺(aq) + S^-(aq) + Cu⁺(aq) + NO₃^-(aq) → CuS(s) + LiNO₃(aq)
C) 2Li⁺(aq) + S^2-(aq) + Cu²⁺(aq) + 2NO₃^-(aq) → Cu²⁺(aq) + S^2-(aq) + 2LiNO₃(s)
D) 2Li⁺(aq) + S^2-(aq) + Cu²⁺(aq) + 2NO₃^-(aq) → CuS(s) + 2Li⁺(aq) + 2NO₃^-(aq)
E) No reaction occurs.

Question 57

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

A) LiOH + Na₂S
B) (NH₄)₂SO₄ + LiCl
C) Sr(C₂H₃O₂)₂ + Na₂SO₄
D) KNO₃ + NaOH
E) None of the above solution pairs will produce a precipitate.

Question 58

Which of the following is a precipitation reaction?

A) Zn(s) + 2AgNO₃(aq) → 2Ag(s) + Zn(NO₃)₂(aq)
B) NaCl(aq) + LiI(aq) → NaI(aq) + LiCl(aq)
C) 2LiI(aq) + Hg₂(NO₃)₂(aq) → Hg₂I₂(s) + 2LiNO₃(aq)
D) HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)
E) None of the above are precipitation reactions.

Question 59

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

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

Question 60

Which of the following describes NaCl?

A) weak acid
B) weak electrolyte
C) strong acid
D) strong electrolyte
E) nonelectrolyte

Question 61

What element is undergoing oxidation (if any) in the following reaction? CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

A) O
B) H
C) C
D) both C and H
E) This is not an oxidation-reduction reaction.

Question 62

Determine the oxidation state of Sn in Sn(SO₄)₂.

A) +2
B) +4
C) +6
D) 0
E) -2

Question 63

Which of the following is an oxidation-reduction reaction?

A) HCl(aq) + LiOH(aq) → LiCl(aq) + H₂O(l)
B) NaI(aq) + AgNO₃(aq) → AgI(s) + NaNO₃(aq)
C) Pb(C₂H₃O₂)₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaC₂H₃O₂(aq)
D) Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
E) All of the above are oxidation-reduction reactions.

Question 64

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

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

Question 65

Determine the oxidation state of C in CO₃^2-.

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

Question 66

Identify the oxidation state of Mg in Mg(s). Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)

A) +1
B) +2
C) 0
D) -1
E) -2

Question 67

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

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

Question 68

Find the volume of 0.110 mol L^-1 hydrochloric acid necessary to react completely with 1.52 g .

A) 0.658 L
B) 1.52 L
C) 1.88 L
D) 1.01 L
E) 0.531 L

Question 69

Which of the following is an acid-base reaction?

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 70

Determine the oxidation state of P in PO₃^3-.

A) +3
B) +6
C) +2
D) 0
E) -3

Question 71

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

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

Question 72

Identify the oxidation state of H in HCl(aq). Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)

A) +1
B) +2
C) 0
D) -1
E) -2

Question 73

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO₃ and HI are mixed.

A) 2H⁺(aq) + SO₃^2-(aq) → H₂SO₃(s)
B) Mg²⁺(aq) + 2I^-(aq) → MgI₂(s)
C) 2H⁺(aq) + SO₃^2-(aq) + Mg²⁺(aq) + 2I^-(aq) → H₂SO₃(s) + MgI₂(aq)
D) 2H⁺(aq) + SO₃^2-(aq) → H₂O(l) + SO₂(g)
E) No reaction occurs.

Question 74

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Al(C₂H₃O₂)₃ and LiNO₃ are mixed.

A) Al³⁺(aq) + 3NO₃^-(aq) → Al(NO₃)₃(s)
B) Li⁺(aq) + C₂H₃O₂^-(aq) → LiC₂H₃O₂(s)
C) Al³⁺(aq) + 3NO₃^-(aq) + Li⁺(aq) + C₂H₃O₂^-(aq) → Al(NO₃)₃(aq) + LiC₂H₃O₂(s)
D) 3Li⁺(aq) + (C₂H₃O₂)₃^3-(aq) → Li₃(C₂H₃O₂)₃(s)
E) No reaction occurs.

Question 75

Identify the oxidation state of Mg in MgCl₂(aq). Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)

A) +1
B) +2
C) 0
D) -1
E) -2

Question 76

Which of the following is a gas-evolution reaction?

A) 2C₂H₆(l) + 7O₂(g) → 4CO₂(g) + 6H₂O(g)
B) 2H₂(g) + O₂(g) → 2H₂O(g)
C) LiCl(aq) + NaNO₃(aq) → LiNO₃(aq) + NaCl(aq)
D) NH₄Cl(aq) + KOH(aq) → KCl(aq) + NH₃(g) + H₂O(l)
E) None of the above is a gas-evolution reaction.

Question 77

Choose the reaction that represents the combustion of C₆H₁₂O₂.

A) C₆H₁₂O₂(l) + 8O₂(g) → 6CO₂(g) + 6H₂O(g)
B) Mg(s) + C₆H₁₂O₂(l) → MgC₆H₁₂O₂(aq)
C) 6C(s) + 6H₂(g) + O₂(g) → C₆H₁₂O₂(l)
D) C₆H₁₂O₂(l) → 6C(s) + 6H₂(g) + O₂(g)
E) None of the above represents the combustion of C₆H₁₂O₂.

Question 78

Identify the polyprotic acid.

A) H₂SO₄
B) HCl
C) NaCl
D) NaOH
E) Li(OH)₂

Question 79

Determine the reducing agent in the following reaction. 2Li(s) + Fe(C₂H₃O₂)₂(aq) → 2LiC₂H₃O₂(aq) + Fe(s)

A) O
B) H
C) C
D) Fe
E) Li

Question 80

Determine the oxidation state of S in MgSO₄.

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