C4. Electrochemistry

Question 2

What is electrolysis?

Answer 2

Electrolysis is the breakdown of an ionic compound, molten or aqueous solution

Question 3

What does inert mean?

Answer 3

Chemically unreactive

Question 4

What is in an electrolyte cell?

Answer 4

A battery
Two electrodes
- cathode
- anode
An electrolyte

Question 5

Is the cathode negative or positive?

Answer 5

Negative

Question 6

Is the anode negative or positive?

Answer 6

Positive

Question 7

What are the main stages of of electrolysis?

Answer 7

1) the electrolyte is made molten or dissolved in water
2) an electric current is passed through the cell
3) cations (metal ions or hydrogen) move twoards the cathode
4) Anions (non-metal ions) move towards the anode
5) metals or hydrogen are formed at the cathode
6) non-metals (except for hydrogen) are formef at the anode

Question 8

What happens during the electrolysis of molten lead bromide?

Answer 8

Lead is produced at the cathode (a silvery solid), bromine at the anode (brown gas at the anode).

Question 9

What happens during the electrolysis of dilute sulfuric acid?

Answer 9

Hydrogen is produced at the cathode (colorless gas), oxygen is produced at the anode (colorless gas).

Question 10

What happens during the electrolysis of concentrated sodium chloride?

Answer 10

Hydorgen is produced at the cathode (colorless gas), chlorine is produced at the anode (pale yellow-green gas).

Question 11

What the difference in electrolysis between an aqueous solution or a molten liquid?