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The Periodic Table
The Alkali Metals - Reaction with Oxygen (burning in air).
How do the Alkali Metals React with Oxygen?
metals react quickly with oxygen
and are stored under
to prevent oxygen from reaching the surface of the bare metal.
Lithium, sodium and
potassium will all burn in air
heated to give the corresponding alkaline oxides (see below).
All of the alkaline oxides formed are white powders
which dissolve in water to form strongly alkaline hydroxides.
How does Sodium React with Oxygen?
Sodium burns in air with an orange flame to form sodium oxide.
4Na(s) + O2(g) 2Na2O(s)
How does Lithium React with Oxygen?
Lithium burns in air with a red flame to form lithium oxide.
lithium + oxygen lithium oxide.
4Li(s) + O2(g) 2Li2O(s)
How does Potassium React with Oxygen?
Potassium burns in air with a lilac flame to form potassium oxide.
potassium + oxygen
4K(s) + O2(g) 2K2O(s)
See the flame tests for the different colours of metals.
Links Alkali Metals Revision Questions
gcsescience.com The Periodic Table Index Periodic Table Quiz gcsescience.com
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