Activity 1.4 Class 9 Science

This activity explains the movement of particles of different substances in same medium and helps to understand how diffusion takes place at different rates.

 

How the movement of particles of different substance takes place?

Aim of the activity

To compare the rate of diffusion of ink and honey in water

Materials used in the activity

1. Ink

2. Honey

3.  Water

4. Two beakers

5. Droppers

Procedure

We take two beakers filled with same amount of water, first we add a drop of blue or red ink slowly along with the sides of the first beaker.

After that we add a drop of honey along with the side of beaker. We make sure not to stir and leave both the beakers in the corner of the classroom.

We observe the changes immediately after adding both substances and after few hours or days.

 

Observation

Immediately after adding the substances

The ink begins to spread slowly in water without stirring and form swirling patterns but honey settles at the bottom.

After a few hours

The ink spreads faster and the water becomes blue or red because particles spread throughout.

But honey takes longer to spread.

Explanation

The particles of ink are smaller and lighter and there is weak force of attraction between them so they move faster and on the other hand honey has heavier particles so they move slowly.

The speed of movement of particles depends upon viscosity of the substance.

Conclusion

This activity proves that

1.  Particles of matter are continuously moving.

2. The rate of movement or diffusion is different for different substances.

3. Lighter particles move faster than heavier particles.

Frequently Asked Questions

1. What is diffusion?

Answer – The process of movement of particles form the region of  high concentration to the region of low concentration.

2. How long does it take for ink to spread completely in water?

Answer – It takes a few hours depending on temperature.

3. What do you observe immediately after adding both ink and honey in water?

Answer – Ink starts spreading immediately but honey settle down in the bottom.

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