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Group 1 : The Alkali Metals
Group 1 : The Alkali Metals : Reactions
1. With oxygen gas
A small amount of the metal oxide is produced but the majority of the product is the metal peroxide
The metal will burn with a characteristic colour. Sodium gives a yellow flame, lithium a red flame and potassium a lilac-coloured flame.
Formation of the oxide:
Formation of the metal peroxide:
2. With hydrogen gas
The metal is heated as hydrogen gas is passed over it. The metal hydride is formed.
3. With water
Lithium reacts less quickly than the other alkali metals. The reaction can be quite explosive with the more reactive metals. A piece of potassium will move quickly over he surface of the water and a small, lilac flame is sometimes seen. The metal hydroxide is formed and hydrogen is released.
4. With halogens
The corresponding salt is formed. The example shows sodium reacting with chlorine gas
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