When a metal reacts with an acid, it forms a salt and hydrogen. It is easily remembered by MASH
Metal
+
Acid
-->
Salt
+
Hydrogen
When hydrogen reacts with oxygen, it releases a lot of energy in the form of heat and light. This creates a flame, making it a combustion reaction.
2H2 + O2 --> 2H2O + energy
This reaction produces pure water as well as energy. We can test for water in a few different ways:
Testing for water
Physical test: Heat the water and see if it boils at 100℃, in which case it is pure.
Chemical test: Expose to anhydrous copper (II) sulphate, a white substance. It will turn blue in presence of water.
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