Avoltaic cell is constructed with two silver-silver chloride electrodes, where the half-reaction is

The silver chloride electrode usually functions as a redox electrode where the equilibrium is achieved between silver and its salt (silver chloride).
The half reaction for this electrode is as follow:
AgCl(s)+e−→Ag(s)+Cl−(aq) where:
(s) refers to solid state
(aq) refers to the aqueous state and 
e- is the electron

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Heating it up with cause a quicker reaction time