Electrochem

Oxidation happens at the

• anode
• cathode
• salt bridge
• voltmeter

Reduction happens at the 

• anode
• cathode
• salt bridge
• voltmeter

Reactions in voltaic cells are

• spontaneous, redox reactions
• non-spontaneous, redox reactions
• spontaneous, non-redox reactions
• non-spontaneous, non-redox reactions

What reaction occurs at the anode?

• Ag⁺ + e^- →Ag
• Ag → Ag⁺ + e^-
• Ni²⁺ + 2e^- → Ni
• Ni → Ni²⁺ + 2e^-

In which direction does electricity flow in a voltaic cell (battery)?

• Electrons flow from the cathode to the anode
• Electrons flow from left to right
• Electrons flow from anode to cathode
• Electrons flow from right to left

Which direction do the electrons flow in wire X and which metal is oxidized?

• A
• B
• C
• D

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-
• Pb⁴⁺ + 2e^- →Pb²⁺
• 2O^-2 →O₂ + 4e^-
• Fe + 3e^- →Fe³⁺

Which statement best describes how a salt bridge maintains electrical neutrality in the half-cells of an electrochemical cell?

• It prevents the migration of electrons.

• It prevents the reaction from occurring spontaneously.

• It permits the migration of ions.

• It allows for the reaction from occurring spontaneously.

When an electrochemical cell is operating, it is

• approaching equilibrium

• using external energy

• undergoing oxidation, only

• undergoing reduction, only

For every electrochemical reaction something must be ​ (a)   and something must be ​ (b)   .

• oxidized
• reduced
• cleaned
• increased