NCERT Class 9 Science Chapter 2 Is Matter Around Us Pure? Solutions
NCERT Class 9 Science Chapter 2 Is Matter Around Us Pure? Solutions INTEX QUESTIONS AND ANSWERS Textbook Page No. 15 1. What is meant by a substance? Ans. A substance is a pure single form of matter. It cannot be separated into other kinds of matter by any physical process. A few examples of substance are sugar, sodium chloride, gold, diamond, etc. 2. List the points of differences between homogeneous and heterogeneous mixtures. Ans. The differences between homogeneous and heterogeneous mixtures are mentioned below: SI NO. Basis of difference Homogeneous mixture Heterogeneous mixture (i) Composition A homogeneous mixture has a uniform composition throughout its mass. A heterogeneous mixture does not have a uniform composition throughout its mass. (ii) physical boundaries of separation It does not have physically distinct boundaries of separation between the various constituents, e.g. sugar in water. It has physically distinct boundaries of separation between the various constituen...