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?

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Solution

Breaking of glass tumbler Burning of paper

It results in the change of the shape of the tumbler. It results in the formation of smoke and water vapour.

The molecules that make up the glass remain the same. The molecules of paper are converted to the molecules of ash.

This is a physical change, as no new substances are formed. This is a chemical change, as paper is converted to ash.

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Breaking of glass tumbler	Burning of paper
It results in the change of the shape of the tumbler.	It results in the formation of smoke and water vapour.
The molecules that make up the glass remain the same.	The molecules of paper are converted to the molecules of ash.
This is a physical change, as no new substances are formed.	This is a chemical change, as paper is converted to ash.