Question

why is the amount of gas collect in one of the test tube is activity 1:7dobule of the amount collectied in other? name this?

Answer 1

in activity 1.7
Electrolysis of water is its decomposition to give hydrogen and oxygen gases due to the passage of an electric current.

 

2H2O + electrical energy (+ heat energy)  gives O2 + 2H2
at anode cantaing test tube collect oxygen gas
and cathode cantaing test tube collect hydrogen gas