Question

Write an activity to show the electrolysis of water as an example of decomposition reactions

Answer 1

Firstly the acidified water which was used as electrolyte breaks down in H+ and OH- Ions. At anode OH- goes and loses electron .

2OH- = H20 +1/2O2 + 2electron

At anode Oxygen gas is evolved.

These electron moves to cathode through wire. At cathode H+ ion is attracted and it gains electron to form H2

2H+ +2 election = H2

So we can see that gas evolved at cathode was doble than the gas evolved at anode. That's how water decomposes.