Galvanic cells

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

Cu²⁺/Cu = 0.34V

Zn²⁺/Zn = -0.76V

• Cu

• Zn

• Cu ions

• Zn ions

A silver rod is put into a solution of magnesium nitrate, silver is below magnesium in the activity series of metals, what will happen?

• silver will be reduced

• bubbles of oxygen gas will form on the silver

• the silver will become plated with magnesium

• no reaction occurs

What occurs to the mass of copper electrode in the following reaction?

Sn/Sn²⁺ // Cu²⁺/Cu

• increases

• decreases

• remains the same

What reaction occurs at the anode?

Ag⁺/Ag = 0.80V

Ni²⁺/Ni = -0.25V

• Ag⁺ + e^- →Ag

• Ag → Ag⁺ + e^-

• Ni²⁺ + 2e^- → Ni

• Ni → Ni²⁺ + 2e^-

What would be the theoretical cell potential of the previous electrochemical cell?

Ag⁺/Ag = 0.80V

Ni²⁺/Ni = -0.25V

• 1.05V

• -1.05V

• 0.55V

• -0.55V

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 drives a redox reaction when electricity is applied.

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

What is a standard half-cell?

• It is one cell that comprises half of a whole battery.

• It is a cell containing only a metal bar with no aqueous ion solution.

• It is a cell containing only an aqueous ion solution and no metal bar.

• It is a cell that generates half of a volt of electricity.

A reducing agent will

• decrease in mass

• gain electrons

• be oxidised

• decrease in oxidation number

In a redox reaction, the species that loses electrons

• is called the cathode

• is reduced

• loses mass at the electrode

• decreases in oxidation number

As an element is oxidized, its oxidation number

• decreases as electrons are lost

• increases as electrons are lost

• decreases as electrons are gained

• increases as electrons are gained