Question

How the electrolysis of water is reversible and chemical change?

Answer 1

Answer:

REVERSIBLE;

Liquid water is being sliced off into H2 and O2 gas. If water was just boiled and became vapour, it would be physical change, however, it became two different elements. Therefore, it's chemical change.  

If pressure and temperature is enough, reverse reaction can always occur to form water again. That's actually the behind mechanism of hydrogen gas fuel. Liquid H2 gas burns with O2 gas to produce water.

CHEMICAL CHANGE;

Water can also undergo a chemical change. Water molecules can be broken down into hydrogen and oxygen molecules by a chemical reaction called electrolysis. When an electric current is passed through liquid water (H2O), it changes the water into two gases—hydrogen and oxygen.