short answer type question
Q) Give reason :
a) gases exert pressure on the walls of the container
b) evaporation cause cooling
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Answers
Answer:
answer for a
The pressure exerted by a gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles in continuous random motion and these particles collide with the walls of the container. These collisions with the walls of the container exerts pressure on the gas.
Explanation:
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Answer:
a A gas exerts pressure on the walls of the container.
Answer: Because of negligible force of attraction between particles of gas, the particles of gas have the highest kinetic energy. These properties enable the particles of gas to move in all directions and hit the walls of container from all sides. Because of this a gas exerts pressure on the walls of the container in which it is kept.
b Evaporation causes cooling because the process requires heat energy. The energy is taken away by the molecules when they convert from liquid into gas, and this causes cooling on the original surface. hope it helps