2. Is Matter Around us Pure – Class 9 Science | NCERT Chapter-wise Important Questions and Answers (CBSE)

Chapter 2: Is Matter Around us Pure – Class 9 Science NCERT | Chapterwise Important Questions and Answers (CBSE)

Chapter 2: Is Matter Around us Pure

Internal Questions:

1. What is meant by a substance?

Answer:  A substance is a pure single form of matter.

Or

A substance refers to a particular type of matter that has a fixed composition and distinct properties. It can be an element or a compound, characterized by its unique set of physical and chemical properties.
2. List the points of differences between homogeneous and heterogeneous mixtures.

Answe: The differences between homogeneous and heterogeneous mixtures are :

I. Homogeneous mixtures have a uniform composition throughout, while heterogeneous mixtures have distinct regions with different compositions.

II. Homogeneous mixtures appear visually uniform, while heterogeneous mixtures can be visually differentiated.

III. Homogeneous mixtures have a single phase, while heterogeneous mixtures have multiple phases.

IV. Homogeneous mixtures are often transparent, while heterogeneous mixtures can be opaque or translucent.

V. Homogeneous mixtures have constant properties throughout, while properties can vary in different regions of a heterogeneous mixture.

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Posted 4 months ago