Chemical Changes: Reaction of Metals with Oxygen (DONE) Flashcards
Describe how metals react with oxygen. Explain the reaction of metals with oxygen in terms of oxidation and reduction.
Chemical reaction between magnesium and oxygen:
Magnesium + Oxygen → Magnesium Oxide
When a metal reacts with oxygen, we form the metal oxide and an oxidation reaction takes place.
What has happened to the magnesium?
The magnesium has been oxidised as it has gained oxygen.
Write the word equation for iron reacting with oxygen.
iron + oxygen → iron oxide
The Iron has been oxidised.
What is meant by an “oxidation” reaction?
An oxidation reaction is a reaction where oxygen is gained and electrons are lost for the reactant.
What is meant by a “reduction” reaction?
A reduction reaction is a reaction where oxygen is lost and electrons are gained for the reactant.
Magnesium oxide → oxygen + magnesium
What is the name of the reaction above and what is happening to the magnesium atoms?
The reaction here is a reduction reaction and here the magnesium atoms have been reduced.
In the reaction below work out which element has been oxidised and which element has been reduced:
Calcium + Copper Oxide → Calcium Oxide + Copper
Calcium has been oxidised as its gained oxygen and copper has been reduced as its lost oxygen.
What is the mnemonic for reduction and oxidation in terms of electrons?
The mnemonic for oxidation and reduction in term of electrons is as follows:
O - oxidation
I - is
L - loss of electrons
R - reduction
I - is
G - gain of electrons
