Question

Class 6 science distinguish between physical and chemical change?

Answer 1

Physical change - in which substance their is no chemical reaction occur is called physical change
chemical change - in which substance chemical reaction occur is called chemical change

Answer 2

physical changes
those which are reversible
chemical not required
eg dough to uncooked roti
chemical changes
those changes which are non reversible
sometimes chemical are involved
eg burning of paper #combustion