Deck 17: Oxidation and Reduction

Question 1

What is the term for the electrode in an electrochemical cell at which reduction occurs?

A)anode
B)cathode
C)oxidation electrode
D)reduction electrode
E)none of the above

Answer 1

cathode

Question 2

What is the term for the providing of electricity to a nonspontaneous redox process to cause a reaction?

A)electrochemistry
B)electrolysis
C)hydrolysis
D)protolysis
E)none of the above

Answer 2

electrolysis

Question 3

What is the term for that portion of an electrochemical cell having a single electrode where oxidation or reduction can occur?

A)dry cell
B)electrolytic cell
C)half-cell
D)voltaic cell
E)none of the above

Answer 3

half-cell

Question 4

What is the term for a substance that causes the reduction of another substance in a redox reaction?

A)anode
B)cathode
C)oxidizing agent
D)reducing agent
E)none of the above

Question 5

What is the general term for any electrochemical cell which produces electrical energy spontaneously?

A)battery
B)dry cell
C)electrolytic cell
D)half-cell
E)none of the above

Question 6

What is the term for the electrode in an electrochemical cell at which oxidation occurs?

A)anode
B)cathode
C)oxidation electrode
D)reduction electrode
E)none of the above

Question 7

What is the term for a chemical reaction that involves electron transfer between two reacting substances?

A)half-reaction
B)oxidation reaction
C)redox reaction
D)reduction reaction
E)none of the above

Question 8

What is the general term for an apparatus that contains two solutions with electrodes in separate compartments connected by a wire and salt bridge?

A)battery
B)electrochemical cell
C)electrolytic cell
D)voltaic cell
E)none of the above

Question 9

Which of the following metals in the free state has an oxidation number of zero?

A)Al
B)Ag
C)Mg
D)Na
E)all of the above

Question 10

What is the term for an electrochemical cell in which a spontaneous redox reaction occurs that generates electrical energy?

A)dry cell
B)electrolytic cell
C)voltaic cell
D)wet cell
E)none of the above

Question 11

What is the term for a reaction that represents an oxidation or a reduction process separately?

A)half-reaction
B)oxidation reaction
C)redox reaction
D)reduction reaction
E)none of the above

Question 12

What is the term for an electrochemical cell in which the anode and cathode reactions do not take place in aqueous solutions?

A)battery
B)dry cell
C)electrolytic cell
D)voltaic cell
E)none of the above

Question 13

What is the term for an electrochemical cell in which a nonspontaneous redox reaction occurs by forcing electricity through the cell?

A)dry cell
B)electrolytic cell
C)voltaic cell
D)wet cell
E)none of the above

Question 14

What is the term for a substance that causes the oxidation of another substance in a redox reaction?

A)anode
B)cathode
C)oxidizing agent
D)reducing agent
E)none of the above

Question 15

What is the term for the study of the conversion of chemical energy to electrical energy from redox reactions?

A)battery chemistry
B)cell chemistry
C)electrochemistry
D)redox chemistry
E)none of the above

Question 16

What is the term for the value assigned to an atom in a substance that indicates whether the atom is electron-poor or electron-rich compared to a free atom?

A)anode number
B)cathode number
C)oxidation number
D)reduction number
E)none of the above

Question 17

What is the term for a porous device that allows ions to travel between two half-cells to maintain an ionic charge balance in each compartment?

A)electrochemical cell
B)oxidation half-cell
C)reduction half-cell
D)salt bridge
E)none of the above

Question 18

What is the term for a process characterized by the loss of electrons?

A)electrochemistry
B)oxidation
C)redox
D)reduction
E)none of the above

Question 19

What is the term for a process characterized by the gain of electrons?

A)electrochemistry
B)oxidation
C)redox
D)reduction
E)none of the above

Question 20

What is the term for the relative ability of a substance to undergo reduction?

A)anode potential
B)cathode potential
C)oxidation potential
D)reduction potential
E)none of the above

Question 21

What is the oxidation number of chromium in Cr₂O₇2-?

A)-2
B)+2
C)+6
D)+7
E)none of the above

Question 22

What is the oxidation number of chlorine in LiClO₂?

A)-1
B)+1
C)+3
D)+5
E)none of the above

Question 23

What is the oxidation number of carbon in CO₃2-?

A)-2
B)+2
C)+4
D)+6
E)none of the above

Question 24

What is the oxidation number of bromine in NaBrO₃?

A)-1
B)+1
C)+3
D)+5
E)none of the above

Question 25

Which of the following nonmetals in the free state has an oxidation number of zero?

A)Ar
B)F2
C)P4
D)S8
E)all of the above

Question 26

What is the oxidation number of carbon in C₂O₄2-?

A)-2
B)+2
C)+3
D)+4
E)none of the above

Question 27

Which of the following monoatomic cations has an oxidation number of +2?

A)CO₂+
B)La3+
C)Ti4+
D)V5+
E)none of the above

Question 28

What is the oxidation number of metallic iron in the elemental state?

A)0
B)+1
C)+2
D)+3
E)none of the above

Question 29

What is the oxidation number of sulfur in S₂O₃2-?

A)-2
B)+2
C)+3
D)+6
E)none of the above

Question 30

What is the oxidation number of carbon in CF4?

A)0
B)+1
C)+2
D)+4
E)none of the above

Question 31

What is the oxidation number of chromium in CrO₄2-?

A)-2
B)+2
C)+4
D)+6
E)none of the above

Question 32

What is the oxidation number of mercury in the mercurous ion,Hg22+?

A)0
B)+1
C)+2
D)+4
E)none of the above

Question 33

What is the oxidation number of iodine in KIO₄?

A)-1
B)+1
C)+3
D)+5
E)none of the above

Question 34

Which of the following monoatomic anions has an oxidation number of -2?

A)H-
B)Se2-
C)As3-
D)P3-
E)none of the above

Question 35

What is the oxidation number of manganese in MnO₂?

A)0
B)+1
C)+2
D)+4
E)none of the above

Question 36

Which of the following semimetals in the free state has an oxidation number of zero?

A)As
B)Ge
C)Sb
D)Si
E)all of the above

Question 37

What is the oxidation number of sulfur in SO₃2-?

A)-2
B)+2
C)+4
D)+6
E)none of the above

Question 38

What is the oxidation number of nitrogen in NH₃?

A)0
B)-1
C)-2
D)-3
E)none of the above

Question 39

What is the oxidation number of chlorine in aqueous HClO₃?

A)-1
B)+1
C)+3
D)+5
E)none of the above

Question 40

What is the oxidation number of liquid bromine in the elemental state?

A)0
B)-1
C)-2
D)-3
E)none of the above

Question 41

What is the oxidation number of chromium in (NH₄)2Cr₂O₇?

A)-2
B)+2
C)+6
D)+7
E)none of the above

Question 42

What substance is the reducing agent in the following redox reaction? Zn(s)+ Cu2+(aq)→ Zn₂+(aq)+ Cu(s)

A)Zn
B)Cu2+
C)Zn₂+
D)Cu
E)none of the above

Question 43

What is the oxidation number of nitrogen in Al(NO₃)3?

A)-3
B)+1
C)+3
D)+5
E)none of the above

Question 44

What is the oxidation number of bromine in aqueous HBrO?

A)-1
B)+1
C)+3
D)+5
E)none of the above

Question 45

What is the oxidation number of iodine in aqueous HIO₂?

A)-1
B)+1
C)+3
D)+5
E)none of the above

Question 46

What is the oxidation number of sulfur in Ca(HSO₄)2?

A)-2
B)+2
C)+4
D)+6
E)none of the above

Question 47

What substance is reduced in the following redox reaction? F2(g)+ 2 Br- (aq)→ 2 F- (aq)+ Br₂(l)

A)F2
B)Br-
C)F-
D)Br₂
E)none of the above

Question 48

What is the oxidation number of carbon in Pb(HCO₃)4?

A)-4
B)+2
C)+3
D)+4
E)none of the above

Question 49

What substance is the oxidizing agent in the following redox reaction? Co(s)+ 2 HCl(aq)→ CoCl₂(aq)+ H₂(g)

A)Co
B)HCl
C)CoCl₂
D)H₂
E)none of the above

Question 50

What is the oxidation number of sulfur in (NH₄)2S₂O₃?

A)-2
B)+2
C)+3
D)+6
E)none of the above

Question 51

What substance is oxidized in the following redox reaction? Zn(s)+ Cu2+(aq)→ Zn₂+(aq)+ Cu(s)

A)Zn
B)Cu2+
C)Zn₂+
D)Cu
E)none of the above

Question 52

What substance is reduced in the following redox reaction? Co(s)+ 2 HCl(aq)→ CoCl₂(aq)+ H₂(g)

A)Co
B)HCl
C)CoCl₂
D)H₂
E)none of the above

Question 53

What substance is the reducing agent in the following redox reaction? F2(g)+ 2 Br- (aq)→ 2 F- (aq)+ Br₂(l)

A)F2
B)Br-
C)F-
D)Br₂
E)none of the above

Question 54

What is the oxidation number of carbon in (NH₄)2C₂O₄?

A)-2
B)+2
C)+3
D)+4
E)none of the above

Question 55

What substance is the oxidizing agent in the following redox reaction? Zn(s)+ Cu2+(aq)→ Zn₂+(aq)+ Cu(s)

A)Zn
B)Cu2+
C)Zn₂+
D)Cu
E)none of the above

Question 56

What substance is the reducing agent in the following redox reaction? Co(s)+ 2 HCl(aq)→ CoCl₂(aq)+ H₂(g)

A)Co
B)HCl
C)CoCl₂
D)H₂
E)none of the above

Question 57

What substance is oxidized in the following redox reaction? F2(g)+ 2 Br- (aq)→ 2 F- (aq)+ Br₂(l)

A)F2
B)Br-
C)F-
D)Br₂
E)none of the above

Question 58

What substance is oxidized in the following redox reaction? Co(s)+ 2 HCl(aq)→ CoCl₂(aq)+ H₂(g)

A)Co
B)HCl
C)CoCl₂
D)H₂
E)none of the above

Question 59

What substance is reduced in the following redox reaction? Zn(s)+ Cu2+(aq)→ Zn₂+(aq)+ Cu(s)

A)Zn
B)Cu2+
C)Zn₂+
D)Cu
E)none of the above

Question 60

What substance is the oxidizing agent in the following redox reaction? F2(g)+ 2 Br- (aq)→ 2 F- (aq)+ Br₂(l)

A)F2
B)Br-
C)F-
D)Br₂
E)none of the above

Question 61

What substance is the oxidizing agent in the following redox reaction? HgCl₂(aq)+ SN₂+(aq)→ Sn4+(aq)+ Hg2Cl₂(s)+ Cl-(aq)

A)HgCl₂
B)SN₂+
C)Sn4+
D)Hg2Cl₂
E)none of the above

Question 62

After balancing the following redox reaction,what is the coefficient of NaCl? Cl₂(g)+ NaI(aq)→ I₂(s)+ NaCl(aq)

A)1
B)2
C)3
D)6
E)none of the above

Question 63

What substance is reduced in the following redox reaction? H+(aq)+ Fe(s)+ NO₃-(aq)→ Fe₃+(aq)+ NO(aq)+ H₂O(l)

A)Fe
B)Fe₃+
C)NO₃-
D)NO
E)none of the above

Question 64

What substance is oxidized in the following redox reaction? HgCl₂(aq)+ SN₂+(aq)→ Sn4+(aq)+ Hg2Cl₂(s)+ Cl-(aq)

A)HgCl₂
B)SN₂+
C)Sn4+
D)Hg2Cl₂
E)none of the above

Question 65

After balancing the following redox reaction,what is the coefficient of O₂? Al₂O₃(s)+ Cl₂(g)→ AlCl3(aq)+ O₂(g)

A)1
B)2
C)3
D)6
E)none of the above

Question 66

Which of the following is a guideline for balancing redox equations by the oxidation number method?

A)Diagram the electrons lost by the substance oxidized and gained by the substance reduced.
B)Place a coefficient in front of the substance oxidized that corresponds to the number of electrons gained by the substance reduced.
C)Place a coefficient in front of the substance reduced that corresponds to the number of electrons lost by the substance oxidized.
D)Verify that the total number of atoms and the total ionic charge are the same for reactants and products.
E)all of the above

Question 67

After balancing the following redox reaction,what is the coefficient of NI₂+? NI₂+(aq)+ NO₃-(aq)+ H+(aq)→ NI₃+(aq)+ NO₂-(aq)+ H₂O(l)

A)1
B)2
C)3
D)6
E)none of the above

Question 68

What substance is the reducing agent in the following redox reaction? HgCl₂(aq)+ SN₂+(aq)→ Sn4+(aq)+ Hg2Cl₂(s)+ Cl-(aq)

A)HgCl₂
B)SN₂+
C)Sn4+
D)Hg2Cl₂
E)none of the above

Question 69

What substance is reduced in the following redox reaction? HgCl₂(aq)+ SN₂+(aq)→ Sn4+(aq)+ Hg2Cl₂(s)+ Cl-(aq)

A)HgCl₂
B)SN₂+
C)Sn4+
D)Hg2Cl₂
E)none of the above

Question 70

After balancing the following redox reaction in acidic solution,what is the coefficient of H+? Mg(s)+ NO₃-(aq)→ Mg₂+(aq)+ NO₂(aq)

A)1
B)2
C)4
D)6
E)none of the above

Question 71

After balancing the following redox reaction,what is the coefficient of CO₂? CO₂O₃(s)+ CO(g)→ Co(s)+ CO₂(g)

A)1
B)2
C)3
D)6
E)none of the above

Question 72

Which of the following is a guideline for balancing a redox equation in basic solution by the half-reaction method?

A)Write a balanced half-reaction for the substance oxidized and the substance reduced.
B)Multiply each half-reaction by a whole number so that the number of electrons lost by the substance oxidized is equal to the electrons gained by the substance reduced.
C)Add the two half-reactions together and cancel identical species on each side of the equation.
D)Verify that the total number of atoms,and that the total ionic charge,are equal for reactants and products.
E)all of the above

Question 73

What substance is oxidized in the following redox reaction? H+(aq)+ Fe(s)+ NO₃-(aq)→ Fe₃+(aq)+ NO(aq)+ H₂O(l)

A)Fe
B)Fe₃+
C)NO₃-
D)NO
E)none of the above

Question 74

Which of the following is a guideline for balancing a redox equation in acidic solution by the half-reaction method?

A)Write a half-reaction for the substance oxidized and the substance reduced.
B)Balance the atoms in each half-reaction;balance oxygen with water and hydrogen with H+.
C)Multiply each half-reaction by a whole number so that the number of electrons lost by the substance oxidized is equal to the electrons gained by the substance reduced.
D)Add the two half-reactions together and cancel identical species on each side of the equation.
E)all of the above

Question 75

What substance is the reducing agent in the following redox reaction? H+(aq)+ Mn(s)+ NO₃-(aq)→ MN₂+(aq)+ NO(aq)+ H₂O(l)

A)Mn
B)MN₂+
C)NO₃-
D)NO
E)none of the above

Question 76

What substance is the oxidizing agent in the following redox reaction? H+(aq)+ Mn(s)+ NO₃-(aq)→ MN₂+(aq)+ NO(aq)+ H₂O(l)

A)Mn
B)MN₂+
C)NO₃-
D)NO
E)none of the above

Question 77

After balancing the following redox reaction in acidic solution,what is the coefficient of H+? Ag(s)+ NO₃-(aq)→ Ag+(aq)+ NO(aq)

A)1
B)2
C)4
D)6
E)none of the above

Question 78

After balancing the following redox reaction,what is the coefficient of H+? MnO₄-(aq)+ SO₂(g)+ H₂O(l)→ MN₂+(aq)+ SO₄2-(aq)+ H+ (aq)

A)1
B)2
C)4
D)6
E)none of the above

Question 79

In order for a redox reaction to be balanced,which of the following is true?

A)Electron gain must equal electron loss.
B)Atoms of each reactant must equal atoms of product.
C)Total ionic charge of reactants must equal total ionic charge of products.
D)all of the above
E)none of the above

Question 80

After balancing the following redox reaction,what is the coefficient of Br-? Cr₂O₇2-(aq)+ Br-(aq)+ H+(aq)→ Cr3+(aq)+ Br₂(l)+ H₂O(l)

A)1
B)2
C)6
D)12
E)none of the above