ELECTROCHEMISTRY

NAME

MATRIC NUMBER

What is a redox reaction?

• A reaction where both reactants get reduced.

• A reaction where both reactants get oxidized.

• A reaction that involves a transfer of electrons between reactants.

• A reaction that involves the combustion of at least one reactant.

What is a galvanic (voltaic) cell?

• It is a cell that destroys electrons on one side and creates electrons on the other side.

• It is a cell that contains only one metal bar and one aqueous ion solution.

• It is a type of battery that generates an electrical current from redox reactions.

• It is a type of battery that drives a redox reaction when electricity is applied.

Which of the following is false regarding galvanic cells?

• It converts chemical energy into electrical energy

• To set up this cell, a salt bridge is used

• The reactions taking place are non-spontaneous

• The electrolytes taken in the two beakers are different

Given their standard reduction potentials, which of the species is going to be oxidized?

Cu²⁺/Cu = 0.34V

Zn²⁺/Zn = -0.76V

• Cu

• ZnSO4

• CuSO4

• Zn

In voltaic cells, the salt bridge _______ .

• is not necessary in order for the cell to work

• allows charge balance to be maintained in the cell

• drives free electrons from one half-cell to the other

• is tightly plugged with firm agar gel through which ions cannot pass

In the standard notation for a voltaic cell, the double vertical line "||" represents:

• a phase boundary

• gas electrode

• a wire (metal) connection

• a salt bridge

In the following reaction

Sn²⁺ + 2Fe³⁺ → Sn⁴⁺ + 2Fe²⁺

the oxidizing agent is....

• Sn⁴⁺

• Sn²⁺

• Fe³⁺

• Fe²⁺

What reaction occurs at the anode?

Ag⁺/Ag = 0.80V

Ni²⁺/Ni = -0.25V

• Ni²⁺ + 2e^- → Ni

• Ag⁺ + e^- →Ag

• Ag → Ag⁺ + e^-

• Ni → Ni²⁺ + 2e^-