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Group 2 The Alkali Earth Metals

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Group 2 The Alkali Earth Metals : Reactions

 

1. With oxygen gas

The metal oxide is produced.

The metal will burn with a characteristic colour. Magnesium gives a bright white flame, calcium a dark red flame, strontium a crimson flame and barium a pale green flame.

Formation of the oxide:

Reaction 1

Equation 1

2. With water

Calcium will react with cold water. Magnesium will react with hot water or steam.

Reaction 2

Equation 2

 

3. With acids

The metal salt is produced in solution and hydrogen gas is liberated. The reaction below shows magnesium with hydrochloric acid.

Reaction 3

Equation 3

 

4. With hydrogen

Calcium, with gentle heating, will react with hydrogen gas to form calcium hydride.

Reaction 4

Equation 4

 

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