sit possible that a substance can undergo both reversible and irreversible changes? If yes, give 2 examples.
Answer:
- Reversible changes are those which can be reversed back to the original state.
- Irreversible changes are those changes that can not be reversed back.
- The same material can undergo both reversible and irreversible changes.
Example 1 : Paper undergoing both reversible and irreversible changes.
- Folding a paper into an airplane and unfolding it back to get the original paper is a reversible change.
- Cutting a paper into smaller different shapes with scissors can not be reversed back to get the exact same paper. So, it is an irreversible change.
Example 2: Balloon undergoing both reversible and irreversible changes.
- Blowing air into a balloon inflates it to a bigger size.
- But, when the air comes out, the balloon turns back to its original shape and size. So, inflating a balloon is a reversible change.
- On the other hand, bursting a fully inflated balloon can never be reversed to get the original balloon back. Therefore, bursting a balloon is an irreversible change.
