50. (a) What is meant by 'diffusion'? Give one example of diffusion in gases.
er Type Questions
(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
51. (a) Compare the properties of solids, liquids and gases in tabular form.
(b) Give two reasons for saying that wood is a solid.
one
During class, the students
esemble molecules in a solid
because they are very close
one another)
While going from
classroom to another the
students resemble molecules
in a liquid (because they are a
little more farther apart from
one another)
And in the playgrou
students resem
molecules in a
(because they are v
very far apart from
another)
2) Why does a gas exert pressure ?
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(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.
(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.
(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.