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Group 2 The Alkali Earth Metals

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Group 2 The Alkali Earth Metals : Compounds

 

1. Oxides

The metal oxides can be formed by heating the metal in a supply of air. They can also be produced by heating the metal hydroxide, metal nitrate or metal carbonate. The example below shows the decomposition of magnesium hydroxide on heating.

Reaction 1

Equation 1

 

When calcium carbonate (limestone) is roasted, calcium oxide is produced and carbon dioxide gas is liberated.

Reaction 2

Equation 2

 

When water is added to the calcium oxide (quicklime), calcium hydroxide (lime water) is produced.

 

Reaction 3

Equation 3

 

2. Hydroxides

The metal hydroxide is produced by adding an alkali to a solution of the metal salt. Barium hydroxide is soluble on water. Strontium hydroxide is slightly soluble in water. Calcium and magnesium hydroxides are insoluble in water and form white precipitates.

Reaction 4

Equation 4

 

3. Chlorides

The metal chloride can be formed by heating the metal in a stream of chlorine gas

Reaction 5

Equation 5

 

4. Carbonates

When calcium carbonate (limestone) is in contact with rain water over a period of time, there is a reaction that produces calcium hydrogen carbonate. This is the compound responsible for temporary hard water.

Reaction 6

Equation 6

 

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