C11 Redox

Question 1

Oxidation

Answer 1

Gain of oxygen or loss of electrons.

Question 2

Reduction

Answer 2

Loss of oxygen or the gain of electrons.

Question 3

Redox

Answer 3

A reaction in which an oxidation and reduction takes place is called a redox reactions.
Electrolysis is a redox reaction- REDuction happens at the cathode (red cat) and OXidation happens at the anode (an ox).

Question 4

Mg + O2→ MgO

Answer 4

●Here the Mg is being oxidised as it is bonding to more oxygen.
●If we look at just the magnesium (removing the oxygen)
●Mg → Mg2+
●The Mg goes from being an Mg2+ ion to an atom (loosing electrons) this is an oxidation reaction.

Question 5

FeSO4 + Mg → MgSO4 + Fe

Answer 5

●Using our knowledge of displacement reactions: More reactive metals will become the ion in solution. They prefer to be oxidised.
●The more reactive a metal is the more easily it will be oxidised.
●Less reactive metals are resistant to oxidation.
●Metals being isolated from their ore is ALWAYS a reduction reaction.