C4 - Reaction Of Metals With Oxygen
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What happens when a metal reacts with oxygen?
A metal oxide is formed.
Example: Magnesium reacting with oxygen
Magnesium + Oxygen → Magnesium Oxide.
What is the definition of oxidation in terms of oxygen?
Oxidation is the gain of oxygen.
What is the definition of reduction in terms of oxygen?
Reduction is the loss of oxygen.
When magnesium reacts with oxygen, what happens to the magnesium?
The magnesium is oxidised (it gains oxygen).
When iron reacts with oxygen, what happens to the iron?
The iron is oxidised (it gains oxygen).
When magnesium oxide is broken down into magnesium and oxygen, what happens to the magnesium?
The magnesium is reduced (it loses oxygen).
When a substance gains oxygen
It has been oxidised.
When a substance loses oxygen
It has been reduced.
In a reaction, if one substance is oxidised and another is reduced, what type of reaction is it?
A redox reaction.
Example: Calcium + Copper Oxide → Calcium Oxide + Copper. Which element is oxidised?
Calcium is oxidised because it gains oxygen.
Example: Calcium + Copper Oxide → Calcium Oxide + Copper. Which element is reduced?
Copper is reduced because it loses oxygen.