9.1.1 What is Chemistry

This is the first lecture from Chapter 1: ‘States of Matter and Phase Changes’ of the new book for Class 9 Chemistry (Punjab Board – PCTB). It provides a basic introduction to chemistry. This lecture includes a multiple-choice quiz, short-answer questions, and detailed long-answer notes.

MCQs Based Quiz

9.1.1 What is chemistry?

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What does the structure of matter refer to?

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What is NOT mentioned as a focus of chemistry?

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What does chemistry help in understanding?

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The properties of water are studied in which branch of science?

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What is required for both physical and chemical changes to occur?

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Which of the following is studied in chemistry?

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What changes are studied in Chemistry?

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Chemistry is the study of:

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Which of the following is studied in chemistry?

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What does the determination of composition involve?

Your score is

The average score is 85%

Short Questions

Q1. What is the definition of chemistry?

Chemistry is the branch of science that studies the properties, composition, structure and chemical reactions of matter. It also studies the laws and principles which the govern the physical and chemical changes in matter.

Q2. What is meant by determination of composition?

Determination of composition means finding out the percentages of elements and compounds that are present in a sample of matter.

Q3. What do you mean by structure of matter?

Structure of matter means the arrangement of atoms in that matter.

Q4. How can you bring about a physical or chemical change?

A physical or chemical change in matter can only be brought about by absorption or evolution of energy.