C6.2 - Changes at the electrodes

Question 1

During electrolysis, what do mobile electrons do?

Answer 1

During electrolysis, mobile electrons move towards the electrodes

Question 2

During electrolysis, mobile electrons move towards the electrodes.
What does the direction they move in depend on?

Answer 2

The direction they move in depends on their charge

Question 3

What happens when ions reach an electrode?

Answer 3

When ions reach an electrode, they either:
1. Lose
Or,
2. Gain electrons

Question 4

When ions reach an electrode, they either lose or gain electrons, depending on their charge.
What do negatively charged ions do to become neutral atoms?

Answer 4

Negatively charged ions lose electrons to become neutral atoms

Question 5

When ions reach an electrode, they either lose or gain electrons, depending on their charge.
What do positively charged ions do to become neutral atoms?

Answer 5

Positively charged ions gain electrons to become neutral atoms

Question 6

Reduction

Answer 6

Reduction is the gain of electrons

Question 7

Oxidation

Answer 7

Oxidation is the loss of electrons

Question 8

What is created through the electrolyte as ions travel to the electrodes?

Answer 8

As ions travel to the electrodes, a flow of charge is created through the electrolyte

Question 9

What happens if 2 elements can be produced at an electrode?

Answer 9

If 2 elements can be produced at an electrode, the least reactive element will usually be formed

Question 10

As some solutions are aqueous (dissolved in water), what happens when electricity passes through them?

Answer 10

As some solutions are aqueous (dissolved in water), when electricity passes through them, water molecules are also ionised

Question 11

The order of discharge at the anode

Answer 11

The order of discharge at the anode is:

Halide ion > Hydroxide > All other negatively charged ions

Question 12

An ion always moves towards what?

Answer 12

An ion always moves towards the oppositely charged electrode

Question 13

When ions reach an electrode, they either lose, or gain electrons, depending on what?

Answer 13

When ions reach an electrode, they either:
1. Lose
Or,
2. Gain electrons
,depending on their charge

Question 14

As some solutions are aqueous (dissolved in water), when electricity passes through them, water molecules are also ionised, so what?

Answer 14

As some solutions are aqueous (dissolved in water), when electricity passes through them, water molecules are also ionised, so the:

1. H+ ions will move to the cathode
2. OH- ions will move to the anode