class 9 chapter 2 science ncert question answer
1. What is meant by a substance? Solution: It is a pure single form of matter. A substance has definite properties and compositions. Example – Iron 2. List the points of differences between homogeneous and heterogeneous mixtures. Solution: 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. Exercise-2.2 Page: 18 1. Differentiate between homogenous and heterogeneous mixtures with examples. Solution: The following are the differences between heterogeneous and homogenous mixtures. Heterogeneous mixture Homogeneous mixture All the particles are completely mixed and can be distinguished with the bare eyes or under a microscope. Particles are uniformly distributed throughout the mixture Irregular composition Has a uniform c...