Redox

Given the equation representing a reaction: Cd + NiO2 + 2H2O → Cd(OH)2 + Ni(OH)2. Which half-reaction equation represents the oxidation in the reaction?

• A) Cd + 2e⁻ → Cd²⁺

• B) Ni⁴⁺ + 2Ni²⁺ + 2e⁻

• C) Ni⁴⁺ + 2e⁻ → Ni²⁺

• D) Cd → Cd²⁺ + 2e⁻

Tags

NGSS.HS-PS1-2

In an electrochemical cell, oxidation occurs at the .

• A) salt bridge

• B) anode

• C) switch

• D) cathode

Which energy conversion occurs in an operating electrolytic cell?

• A) nuclear energy to electrical energy

• B) electrical energy to nuclear energy

• C) chemical energy to electrical energy

• D) electrical energy to chemical energy

Tags

NGSS.HS-PS3-3

Given the equation representing a reaction: 3CuCl2(aq) + 2Al(s) → 3Cu(s) + 2AlCl3(aq). The oxidation number of copper changes from to .

• A) +1 to 0

• B) +2 to +1

• C) +2 to 0

• D) +6 to +3

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The diagram and equation below represent an electrochemical cell. Which process is represented by this diagram?

• A) chromatography

• B) distillation

• C) polymerization

• D) electrolysis

Tags

NGSS.HS-PS3-5

A key is plated with nickel as shown in the diagram below. Which type of cell is represented by the diagram and what change occurs?

• A) voltaic cell; a chemical change produces electrical energy

• B) electrolytic cell; a chemical change produces electrical energy

• C) voltaic cell; electrical energy produces a chemical change

• D) electrolytic cell; electrical energy produces a chemical change

Tags

NGSS.HS-PS1-4

NGSS.HS-PS2-5

NGSS.HS-PS3-3

Based on Table J, which ionic equation represents a spontaneous reaction that can occur in a voltaic cell?

• A) Fe(s) + Mg²⁺(aq) → Fe²⁺(aq) + Mg(s)

• B) Fe²⁺(aq) + Mg²⁺(aq) → Fe(s) + Mg(s)

• C) Fe(s) + Mg(s) → Fe²⁺(aq) + Mg²⁺(aq)

• D) Fe²⁺(aq) + Mg(s) → Fe(s) + Mg²⁺(aq)

Tags

NGSS.HS-PS1-2

Which process occurs at the anode in an electrolytic cell?

• A) addition

• B) oxidation

• C) reduction

• D) combustion

In a voltaic cell, oxidation occurs .

• A) in the salt bridge

• B) in the external circuit

• C) at the anode

• D) at the cathode

Which reaction occurs at the anode in an electrochemical cell?

• esterification

• oxidation

• saponification

• reduction