DE CHEM Unit 12: Ecell

What is reduction?

• It is the gain of electrons.

• It is the loss of electrons.

• It is the creation of electrons.

• It is the destruction of electrons.

What is oxidation?

• It is the gain of electrons.

• It is the loss of electrons.

• It is the creation of electrons.

• It is the destruction of electrons.

What is an oxidizing agent?

• It is the species that gets reduced -- gains electrons.

• It is the species that gets oxidized -- loses electrons.

• It is the species that creates electrons.

• It is the species that loses electrons.

What is an anode?

• It is the electrode where oxidation takes place.

• It is the electrode where reduction takes place.

• It is an aqueous solution containing an electrode.

• It is the salt bridge that connects half-cells.

What is a cathode?

• It is the electrode where oxidation takes place.

• It is the electrode where reduction takes place.

• It is an aqueous solution containing an electrode.

• It is the salt bridge that connects half-cells.

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

Cu²⁺/Cu = 0.34V

Zn²⁺/Zn = -0.76V

• Cu

• Zn

• CuSO4

• ZnSO4

Which metal is the anode?

Zn/Zn²⁺ // Cu²⁺/Cu

• zinc

• copper

Table shows information about three chemical cells.

What is the possible potential difference of the chemical cell when metal Z is paired with W ?

• 0.3 V

• 1.2 V

• 1.5 V

• 2.1 V

In the above Galvanic Cell, which half cell is undergoing reduction?

• Cu | Cu²⁺

• Zn | Zn²⁺

The standard reduction potentials at 25^◦C for two electrodes are

 

Cd²⁺ + 2 e⁻ → Cd                  E^∘= −0.40 volts

Fe²⁺ + 2 e⁻ → Fe                  E^∘= −0.44 volts

 

A standard, voltaic cell made with these two electrodes would have a voltage of _______ and the Fe electrode would be the _________.

• -0.04V; cathode

• -0.04V; anode

• +0.04V; cathode

• +0.04V; anode