Question

When a gas is compressed at constant temperature.
A.The speed of the molecules increase
B.The collision between the molecules increases.
C.The speed of the molecules decrease
D.The collision between the molecules decreases.

Answer 1

Hint: A collision is the event in which two or more bodies exert forces on each other in about a relatively short time. When two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

Complete step by step answer:
According to Boyle’s law,
“The volume of a gas is inversely proportional to pressure keeping the temperature the same”.
It means if you increase one entity, another will directly decrease. And if you are applying more pressure, the volume of the gas will decrease and if you are removing pressure, gas molecules will expand.
Hence, when the gas is compressed, its molecules come closer and internal energy of gas is increased and the number of collisions will also increase.
As the gas is compressed, the work done on it shows up as increased internal energy, which must be transferred to the surroundings to keep the temperature constant.
The volume of gas increases when temperature increases and hence the molecules of gas will have more kinetic energy and the molecules will strike the container with more force.

Hence, option B is correct.

Note:
Since the boiling point is dependent on pressure, you can use Boyle’s law and a syringe to make water boil at room temperature. Deep sea fish die when they’re brought from the depths to the surface. The pressure decreases dramatically as they are raised, increasing the volume of gases in their blood and swim bladder.