Question

15. Give one example in each case
Change which occurs on heating but can be reversed
(b)
Change which occurs on heating but cannot be reversed.
la
(d)
Change which occurs on cooling but can be reversed
Change which occurs on mixing two substances, but
can be reversed
Change which occurs on mixing two substances, but
cannot be reversed​

Answer 1

Answer:

1.Change which occurs on heating but can be reversed:

example. (a) mixing of salt in water is a change that can be reversed by heating and melting of salt. (b) mixing of salt in water is a change that cannot be reversed.

Answer 2

Answer:

Explanation:

mixing of salt in water is a change that can be reversed by heating and melting of salt.

b]The softening of iron on heating to red hot stage is a reversible change. And when the hot iron is cooled, it becomes hard again.

c] Size of the candle was reducing. Melted wax was getting solidified.