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Matter in Our Surroundings
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07/11/2021 4:44 pm
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(a) What is meant by ‘diffusion’? Give one example of diffusion in gases.
(b) Why do gases diffuse very fast?
(c) Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature?
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07/11/2021 4:45 pm
(a) Diffusion is the mixing of a substance with another substance due to the motion of its particles. The smell of perfume spreads over a whole room is an example for diffusion.
(b) Gases diffuse fast because of the large space between the particles in gases and high kinetic energy.
(c) Carbon dioxide and oxygen are the two gases in air which dissolves in water by diffusion. Carbon dioxide is important for aquatic plants for the photosynthesis. Oxygen is used by aquatic animals for breathing.