Topic 5 - Unit 20 Oxidation And Reduction

Question 1

Reduction and Oxidation

Answer 1

They always take place together (called the REDOX reaction)

Question 2

Definitions of Reduction (4 in total)

Answer 2

1. The loss of oxygen from a chemical species
2. Gain of hydrogen by a chemical species
3. Gain of electron by a chemical species (RIG)
   4.

Question 3

Definitions of Oxidation (4 in total)

Answer 3

1. Gain of oxygen by a chemical species
2. Loss of hydrogen from a chemical species
3. Loss of electrons from a chemical species (OIL)
4. Increase in oxidation number

Question 4

Oxidising Agent

Answer 4

A chemical species that causes oxidation of another chemical species while itself becomes reduced in the process.

Question 5

Reducing Agent

Answer 5

A chemical species that causes reduction of another chemical species while itself becomes oxidised in the process.

Question 6

Procedures when writing a half equation in acid solution

Answer 6

1. Balance the numbers of all atoms except hydrogen and oxygen.
2. Add water (H2O) to the side deficient in oxygen to balance the number of hydrogen atoms.
3. Add H+ to the side deficient in hydrogen to balance the number of hydrogen atoms.
4. Add e- to the side deficient in negative charge to balance the charge.