3 - Redox

Question 1

What is oxidation?

Answer 1

loss of electrons

• gain of oxygen
• loss of hydrogen

Question 2

what is reduction?

Answer 2

gain of electrons

• loss of oxygen
• gain of hydrogen

Question 3

what is a disproportionation reaction?

Answer 3

When an element in a single species is both oxidised and reduced in the same reaction.

Question 4

What is an oxidising agent?

Answer 4

• causes other substances to be oxidised.

- it is reduced itself.

Question 5

what is a reducing agent?

Answer 5

• causes other substances to be reduced.

- it is oxidised itself.

Question 6

What causes an element in a compound to have a negative oxidation number?

Answer 6

being more electronegative.

Question 7

How to name a compound using oxidation numbers?

Answer 7

Provide the oxidation number of the unknown element e.g. sulfur(VI) oxide for SO3

Question 8

How to form an equation using oxidation numbers

Answer 8

• form an ionic half equation for the element that changes oxidation, ignoring other elements
• balance the charge of the reactants using H+ for acid and OH- for base
• add water to the products