Question

Cold milk is heated and it becomes hot. Its a reversible change. Why?

Answer 1

Because it can be cool down if we leave it for few minutes.

you will notice some cream are just formed on the top of milk..

that can't be reversed

Answer 2

Answer- The above question is from the chapter 'Physical and Chemical Changes'.

4 basic characteristic features to prove that a chemical change has taken place are:

1. Evolution of heat and light

2. Change of colour

3. Evolution of gas

4. Change of odour

Chemical changes are usually irreversible changes while physical changes are reversible changes.

Given question: Cold milk is heated and it becomes hot. It's a reversible change. Why?

Answer: Yes, it is a reversible change because:-

1) Heating and cooling of milk is a physical change.

2) The properties of milk don't change.