Ans: Chemistry is that branch of science in which the properties of substance,their
composition and their structure is studied.
For example:
1. Melting of Ice
2. Evaporation of water
3. Rate of a chemical Reaction
These are complete and easy notes for Class 9 Chemistry Chapter 1 - What is Chemistry? for Punjab Board students. In this document you will learn definition of chemistry, composition, structure, and branches of chemistry like Physical Chemistry and Inorganic Chemistry with simple examples. Notes are easy to understand and exam oriented.
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