Physics Structure of Matter Questions and Answers - 1

Question: 1

Define mixture?

A mixture contains two or more pure substances mixed together in any ratio.

Example – Salt solution, air

Question: 2

Name the three states of matter?

The three states of matter are solid, liquid and gas.

Examples:

Solid – Copper sulphate, common salt

Liquid – Kerosene, water

Gas – Oxygen, carbon dioxide

Question: 3

What is called sublimation?

The process by which a solid directly changes into gaseous state on heating without attaining the liquid state is called sublimation.

Question: 4

Name any four diatomic molecules?

Hydrogen molecule, oxygen molecule, chlorine molecule and nitrogen molecule are diatomic molecules.

Each of them contains two atoms.

Question: 5

What is an element?

Any pure substance which cannot be broken into two or more pure substances by any physical or chemical means is called an element.