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.
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