Electrolysis

Question 1

State what is meant by the term ‘electrolysis’.

Answer 1

Electrolysis is the electrical decomposition of an ionic compound

Question 2

What is an electrolyte?

Answer 2

A molten or dissolved ionic compound

Question 3

Describe how electrolysis works.

Answer 3

A direct current supply is used to pass an electric current through an electrolyte, causing it to decompose

Question 4

In terms of electrons, describe what is meant by ‘oxidation’.

Answer 4

Oxidation is the loss of electrons

Question 5

In terms of electrons, describe what is meant by ‘reduction’.

Answer 5

Reduction is the gain of electrons

Question 6

At which electrode does oxidation happen during electrolysis?

Answer 6

Anode

Question 7

At which electrode does reduction happen during electrolysis?

Answer 7

Cathode

Question 8

What happens when ions gain or lose electrons during electrolysis?

Answer 8

They become atoms and are discharged from the electrolyte

Question 9

What is an electrochemical cell?

Answer 9

An electrochemical cell is a circuit, comprised of the anode, cathode, electrolyte, a power source and the wires that connect the two electrodes

Question 10

How would you set up an electrochemical cell if your electrolyte is a solution?

Answer 10

• Get two inert electrodes
• Clean surfaces of electrodes with emery paper
• Avoid touching surfaces of electrodes to prevent transfer of dirt/grease
• Place both electrodes into beaker filled with electrolyte
• Connect the electrodes to a power supply using wires and clips. Turn power on and a current will flow through the cell, causing the electrolyte to decompose

Question 11

How would you set up an electrochemical cell if your electrolyte is a molten ionic substance?

Answer 11

• Put solid ionic substance in crucible
• Heat crucible with bunsen burner until solid is molten
• Once solid is molten, dip two clean, inert electrodes into the electrolyte
• Connect the electrodes to a power supply using wires and clips. Turn power on and a current will flow through the cell, causing the electrolyte to decompose