U1-1-1 - Oxidising and Reducing Agents

Question 1

Reduction

Redox definition

Answer 1

Gain of electrons (by a reactant)

Question 2

Oxidation

Redox definition

Answer 2

Loss of electrons (by a reactant)

Question 3

Oxidising agent

Answer 3

A substance that accepts electrons

(and oxidises another substance)

Question 4

Reducing agent

Answer 4

A substance that donates electrons

(and reduces another substance)

Question 5

The ______ agent gets reduced.

Answer 5

oxidising

Question 6

The ______ agent gets oxidised.

Answer 6

reducing

Question 7

Identify the oxidising agent:

Zn(s) + Cu²⁺(aq) ⟶ Zn²⁺(aq) + Cu(s)

Answer 7

Cu²⁺ (accepts electrons from Zn)

note the decrease in charge due to electrons gained

Question 8

Identify the reducing agent:

Zn(s) + Cu²⁺(aq) ⟶ Zn²⁺(aq) + Cu(s)

Answer 8

Zn (donates electrons to Cu²⁺)

note the increase in charge due to electrons lost

Question 9

Substances containing a lot of oxygen atoms tend to be ____ agents.

Answer 9

oxidising

Question 10

CO can act as a _____ agent.

Answer 10

reducing

Question 11

Why are oxidising agents added to consumer products?

Answer 11

Any one of:
* kill fungi and bacteria
* inactivate viruses
* break down coloured compounds.