Classify the following as chemical change or physical change:
Passing of electric current through water and the water breaking down into hydrogen and oxygen gases.
Passing of electric current through water and the water breaking down into hydrogen and oxygen gases is a chemical change because redox reaction takes place during the electrolysis of water.
Reaction:
$$\mathrm{2H_2O(l) \rightarrow 2H_2(g) + O_2(g)}$$