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?

1 / 10

What does chemistry help in understanding?

Movement of planets around the sun

The properties of matter

The formation of galaxies

The laws of motion

2 / 10

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

Change in Pressure

Increase in Temperature

Absorption or evolution of energy

All of these

3 / 10

Chemistry is the study of:

Composition of Matter

Properties of Matter

Reactions of Matter

All of these

4 / 10

Which of the following is studied in chemistry?

Top speed of a car

Structure of the car

Composition of Car Paint

All of these

5 / 10

What changes are studied in Chemistry?

Only physical changes

Only chemical changes

Both physical and chemical changes

Neither physical nor chemical changes

6 / 10

What does the structure of matter refer to?

The way elements react with each other

The arrangement of atoms in matter

The shape of a substance

The color of a compound

7 / 10

What is NOT mentioned as a focus of chemistry?

Properties of substances

Structure of substances

Composition of substances

Speed of moving objects

8 / 10

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

Chemistry

Biology

Physics

All of these

9 / 10

What does the determination of composition involve?

Finding the weight of matter

Identifying colors of substances

Determining percentages of elements and compounds in a sample

All of these

10 / 10

Which of the following is studied in chemistry?

Reproduction in Plants

Photosynthesis in Plants

Diseases in Plants

All of these

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.