NCERT Science Class 9 Chapter 1 Matter in Our Surrounding Page 3 Solutions and Answers

Here are the solutions of the NCERT science book, page 3. These questions are part of the chapter Matter in Our Surrounding, which is the chapter 1 in the book. This chapter falls in Chemistry, and these questions are very important for exams and tests.

All these questions have been answered by us. So here are the NCERT Science Class 9 Chapter 1 Matter in Our Surrounding Page 3 Solutions and Answers.

Which of the following are matter? Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.

Answer: Chair almond, cold drink, air, and smell of perfume are matter.
Reasoning: The smell of any substance is the gaseous form of that substance, so it is matter.

Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

Answer: Gases diffuse at a fast rate. But, if the temperature of the gases is increased, then the rate of diffusion increases. As the rate of diffusion is directly proportional to temperature.

As with an increase in the kinetic energy the particles vibrate faster, and thus, they spread and diffuse faster. 

Thus, the smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

Answer: The ability of a diver to cut through water in a swimming pool shows that matter is made up of particles. When the diver cuts through the water, he exerts some force, due to which the particles seprate and allow him to swim.

Another aspect used in that particles of matter attract each other, as here the diver applies some force due to which he breaks the forces of attraction between the particles.

What are the characteristics of particles of matter?

Answer:

1. Particles of matter have spaces between them.
2. Particles of matter are continuously moving.
3. Particles of mater attract each other.

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