AQA A level Chemistry 3.1.7 Redox

What does redox mean? (1)

Reactions which involve both reduction and oxidation

What is oxidation? (1)

Process of electron loss

What is reduction? (1)

Process of electron gain

What is an oxidising agent? (1)

Electron acceptor

What is a reducing agent? (1)

Electron donor

What is the oxidation state of elements not combined with others? (1)

0

What is the oxidation state of oxygen in compounds, except in peroxides? (1)

-2

What is the oxidation state of oxygen in peroxides (e.g., H2O2)? (1)

-1

What is the oxidation state of hydrogen in compounds, except in metal hydrides? (1)

+1

What is the oxidation state of hydrogen in metal hydrides (e.g., NaH)? (1)

-1

What is the oxidation state of Group I metals in compounds? (1)

+1

What is the oxidation state of Group II metals in compounds? (1)

+2

What is the usual oxidation state of Group 7 in compounds? (1)

-1

What does an increase in oxidation state indicate? (1)

Oxidation

What does a decrease in oxidation state indicate? (1)

Reduction

What is the best order of balancing half equations? (5)

1. Balance atoms apart from hydrogen or oxygen

2. Balance oxygen using water

3. Balance hydrogen using H+

4. Balance charge using electrons

5. Double check its all balanced