Redox

Question 1

What is the oxidation number?

Answer 1

The charge an atom would have if the compound was composed of ions

Question 2

How do you calculate oxidation number?

Answer 2

Set rules for certain elements, oxidation number for a:

• free element is 0
• fluorine is -1
• group 1 metals is +1
• group 2 metals is +2
• oxygen is +2 except -1 in H₂O₂, +2 in OF₂
• hydrogen is +1 in non metals, -1 in metal

Add up to 0 in a compound

Question 3

What is oxidation (in terms of electron transfer)

Answer 3

.he loss of electrons

Question 4

What is reduction (in terms of electron transfer)

Answer 4

the gain in electrons

Question 5

What does a change in oxidation number mean?

Answer 5

It has either been oxidised or reduced