Ch.8: Oxidation and Reduction

Which of the following is not one of the ways we can view oxidation?

a. electrons gained

b. electrons lost

c. hydrogen atoms lost

d. oxygen atoms gained

a. electrons gained

Which of the following is not one of the ways we can view reduction?

a. electrons gained

b. electrons lost

c. hydrogen atoms gained

d. oxygen atoms lost

b. electrons lost

When CrO4- reacts to form Cr3+, the chromium in CrO4− is

a. reduced; it loses electrons

b. reduced; it loses oxygen

c. oxidized; its oxidation number increases

d. oxidized; it gains a positive charge

b. reduced; it loses oxygen

According to the following equation, Cl2

is

3 Cl2+2 Al→2 AlCl3

a. both oxidized and reduced

b. neither oxidized nor reduced

c. oxidized, only

d. reduced only

d. reduced only

According to the following partial equation, manganese

Mn→Mn2++2 e−

a. gains electrons and is oxidized

b. gains electrons and is reduced

c. loses electrons and is oxidized

d. loses electrons and is reduced

c. loses electrons and is oxidized

When an element is oxidized, its oxidation number

a. decreases, as electrons are gained

b. decreases, as electrons are lost

c. increases, as electrons are gained

d. increases, as electrons are lost

d. increases, as electrons are lost

When an element is reduced, its oxidation number

a. decreases, as electrons are gained

b. decreases, as electrons are lost

c. increases, as electrons are gained

d. increases, as electrons are lost

a. decreases, as electrons are gained

In an electrochemical cell, electrons flow from the

a. anode to the cathode

b. cathode to the anode

c. anode to the salt bridge

d. salt bridge to the cathode

a. anode to the cathode

Which statement is not true in regards to lithium batteries?

a. are low density

b. are used in laptop computers

c. provide high voltage

d. are nonrechargeable

d. are nonrechargeable

Why are most modern high-performance electronic devices powered by lithium-based batteries? (Select all that apply.)

a. Lithium-based batteries are light weight.

b. Lithium-based batteries may be formed into nearly any shape.

c. Lithium-based batteries are rechargeable.

d. Lithium-based batteries provide higher voltage than othher battery types.

e. Lithium-based batteries are resistent to overheating.

a. Lithium-based batteries are light weight.

b. Lithium-based batteries may be formed into nearly any shape.

c. Lithium-based batteries are rechargeable.

d. Lithium-based batteries provide higher voltage than othher battery types.

At the anode, the metal is ______ and _______.

a. reduced/gains electrons

b. oxidized/gains electrons

c. oxidized/loses electrons

d. reduced/loses electrons

c. oxidized/loses electrons

At the cathode, oxygen is ______ and _______.

a. oxidized/loses electrons

b. reduced/loses electrons

c. oxidized/gains electrons

d. reduced/gains electrons

d. reduced/gains electrons

Relate the chemistry of photosynthesis to the chemical process that provides energy for your heartbeat.

a. Photosynthesis is an oxydation.

b. Photosynthesis is a reduction.

c. Energy which produces the heartbeat is an oxydation.

d. Energy which produces the heartbeat is a reduction.

b. Photosynthesis is a reduction.

c. Energy which produces the heartbeat is an oxydation.

Give one reason why it can be difficult to design a long-lived oxidation catalyst.

a. The organic part of the catalyst is a target for oxidation.

b. The inorganic part of the catalyst is a target for reduction.

c. The inorganic part of the catalyst is a target for oxidation.

d. The organic part of the catalyst is a target for reduction.

a. The organic part of the catalyst is a target for oxidation.

All of the following are associated with oxidation except

a. gain oxygen

b. lose hydrogen

c. gain electrons

d. increase oxidation number

c. gain electrons

All of the following are associated with reduction except

a. lose oxygen

b. gain hydrogen

c. lose electrons

d. decrease oxidation number

c. lose electrons

electrodes where oxidation occurs

anodes

electrodes where reduction occurs

cathodes

cause oxidation

a. oxidizing agents

b. reducing agents

a. oxidizing agents

cause reduction

a. oxidizing agents

b. reducing agents

b. reducing agents