Chapter 2: Is Matter Around Us Pure?

Q1Written answer

What is meant by a substance?

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A substance is a pure single form of matter. It has definite properties and compositions. Example: Iron

Q2Written answer

List the points of difference between homogeneous and heterogeneous mixtures.

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Homogeneous mixture	Heterogeneous mixture
Particles are uniformly distributed throughout the mixture	All the particles are completely mixed and can be distinguished with the bare eyes or under a microscope
Has a uniform composition	Irregular composition
No apparent boundaries of division	Noticeable boundaries of division