Question

According to kinetic theory of gases:
(A)Collisions are always elastic
(B)Heavier molecules transfer more momentum to the wall of the container
(C)Only a small number of molecules have very high velocity
(D)Between collisions, the molecules move in straight lines with constant velocities

Answer 1

A model to explain the thermodynamic behavior of molecules of gases is kinetic theory of gases. It made postulates to explain the velocities, path of movement of gas molecules.

Complete step by step solution:
According to postulates of kinetic theory of gases-
1- Molecules of gases are very tiny particles that the volume of a gas molecule is negligible compared to the total volume of the gas in the container. That means the actual volume occupied by gas particles is almost nothing thus compressibility of gases can be explained.
2- The attractive force between the gas molecules is nil this explains the reason for inability of gases to settle at the base of the container by forming aggregates.
3- Molecules of gases move randomly in straight lines and rapidly with constant velocity which makes the gases to escape and spread easily in empty spaces.
4- Gas molecules collide with the walls of the container while moving rapidly and also with the molecules of gases themselves. Energy does not be lost by these collisions so they are elastic collisions.
5- The average kinetic energy of particles of gas are independent of temperature and composition of the particular gas.

So, the answer for the question is multi correct and the options are (A) and (D).

Note: Kinetic molecular theory of gases explains the thermodynamic. The thermodynamic properties of gas molecules are in terms of temperature and velocity (kinetic energy).