Activity 1.3 Class 9 Science

This activity teaches us that particles of matter are in constant motion. The speed of movement of particles depends upon their physical state whether they are solid or liquid or gaseous.

 

Are Particles of Matter are continuously moving?

Aim of the activity

To show that particles of matter are in constant motion and can diffuse into air.

 

Materials used in the activity

1. Incense stick

2. Matchbox or lighter

Procedure

First, we put an unlit incense stick in a corner of our classroom. Now we go near it to get it smell.

Now we light the incense stick and sit at a distance in the classroom. We record the observations in both cases.

Observation

When the incense stick is unlit then to smell it, we will have to go very close to it but when the incense stick is lightened then we will get its smell from a distance.

Explanation

We had to go closer to the incense stick to smell when it was unlit but when it was lighted, we could smell from the distance.

The difference is the rate of diffusion. The rate of diffusion depends upon kinetic energy. Gaseous particles have more kinetic energy than solid or liquid particles.

When we lighten the incense stick, its volatile particles start moving continuously in the air, so we can smell it from a distance.

Conclusion

The activity proves that

1.  Particles of matter are constantly moving.

2. The rate of motion of particles is different in solids, liquid and gaseous particles.

3. Heat increases the speed of particle movement.

4. Particles diffuse into air so we can smell from a distance.

Frequently Asked Questions

1. Why are we not able to smell the unlit or unburnt incense stick form distance?

Answer – Because particles of unburnt incense stick are in solid state and they do not move freely in air so we are not able to smell.

2. Why do we smell the incense stick when it is lit?

Answer – Heat makes the particles move quickly so they get diffused faster in the air that’s why we cam smell.

3. What is diffusion?

Answer - Diffusion is the phenomenon of movement of any particles from region of higher concentration to region of lower concentration.

4. Name the phenomenon by which they move in the air?

Answer - Diffusion

5. What is the aim of the activity?

Answer – To show that particles of matter are in constant motion and can diffuse into air.

 

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