Answer: a chemical change
Explanation:
A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions. Example: melting of ice
A chemical reaction is defined as the reaction in which a change in chemical composition takes place.A new substance is formed in these reactions.
Decomposition of water using electric current to produce hydrogen and oxygen is called as electrolysis and is a chemical change.
[tex]2H_2O\rightarrow 2H_2+O_2[/tex]
