Redox

Question 1

Oxidising agent

Answer 1

Something that causes oxidation by reduction (gaining electrons)

Question 2

Reducing agent

Answer 2

Something that causes reduction by oxidising itself (losing electrons)

Question 3

Oxidation number

Answer 3

Oxidation numbers are assigned to atoms/ions to indicate the extent to which they are oxidised or reduced

Question 4

Oxidation number exceptions

Answer 4

• H is usually +1 BUT -1 when bonded to a metal as a hydride
• O is usually -2 BUT -1 when present as a peroxide (eg H2O2)

Question 5

Balancing redox equations in acidic conditions (H2O and H+ available)

Answer 5

1. Balance the species reacting
2. Add water to balance oxygen
3. Add H+ to balance hydrogen
4. Add electrons to balance charge