Question

Breaking of a glass tumbler and burning of paper are changes in which we cannot get back the original substances. What is the difference between these two changes?

Answer 1

When glass is broken, no new substance is generated, and the chemical characteristics and chemical composition of the glass remain unchanged; yet, when paper is burned, the chemical composition changes.

Complete Step By Step Answer:
We can't bring the basic substances back into enhancements like breaking a tumbler glass or burning paper.
Explanation:
We can't bring the basic substances back into enhancements like breaking a tumbler glass or burning paper. The following are the differences between the two changes: -
Breaking of tumbler glass:
1. The tumbler's shape changes as a result of it.
2. A glass's molecules are all the same.
3. Because there are no new substances arising, this is a physical transformation.
Paper Burning:-
1. It contributes to the creation of water and smoke.
2. The molecules of paper are converted into ash molecules.
3. Because ash is transferred to paper, this is a chemical transition.

Note:
It should be noted that, statement about physical change that 'all physical changes are reversible' is only partially valid because some physical changes can be reversed, such as ice melting, in which the water moves from a solid to a liquid form and can be reversed. However, some modifications, such as the burning of wood, the tearing of paper, and others, are irreversible.
As a result, the given statement might be changed to “Most Physical Changes are Reversible, but Not All.”