Physics Structure of Matter Questions and Answers - 1
A mixture contains two or more pure substances mixed together in any ratio.
Example â€“ Salt solution, air
Name the three states of matter?
The three states of matter are solid, liquid and gas.
Solid â€“ Copper sulphate, common salt
Liquid â€“ Kerosene, water
Gas â€“ Oxygen, carbon dioxide
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.
Name any four diatomic molecules?
Hydrogen molecule, oxygen molecule, chlorine molecule and nitrogen molecule are diatomic molecules.
Each of them contains two atoms.
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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