Molecules in the gas phase undergo many collisions. Which one statement is NOT correct? a. For a give gas sample in a fixed-volume container, the frequency of gas collisions (number of collisions per second) with the container walls increases with increasing temperature. b. Collisions of gas molecules with the container walls give rise to the gas pressure. c. All molecules of the same mass hit the container walls with the same force d. Collisions between gas-phase molecules occur in all gas samples, both for ideal and for non-ideal gases. e. In typical gas-phase collision between two molecules, the speed of each of these molecules undergoes a change
Molecules in the gas phase undergo many collisions. Which one statement is NOT correct?
a.
For a give gas sample in a fixed-volume container, the frequency of gas collisions (number of collisions per second) with the container walls increases with increasing temperature.
b.
Collisions of gas molecules with the container walls give rise to the gas pressure.
c.
All molecules of the same mass hit the container walls with the same force
d.
Collisions between gas-phase molecules occur in all gas samples, both for ideal and for non-ideal gases.
e.
In typical gas-phase collision between two molecules, the speed of each of these molecules undergoes a change.
a) On increasing temperature the average velocity of molecules increases, the randomness increases and there will be more collisions per second which means the frequency increases. Thus the statement is correct.
b) Pressure is measured as the force acting on the wall per unit area. The collision of molecules results in force exerting on the wall which results in pressure.
c) In a container each molecule has a different velocity and depending on the velocity of each molecule the force exerted by each molecule on the walls of the container will be different. the statement is wrong.
d) Both ideal gases and non-ideal gases show collisions due to their random motions in the container. But in the case of n0n-ideal gases, the pressure exerted on the walls of the container is less because of the intermolecular attractive force between the molecules, which is absent in ideal gases.
e) While a molecule collides with each other energy is transferred. For example, consider two molecules A and B. Let Molecule A is in motion and molecule B is stationary. When molecule A hits molecule B, there is the transfer of energy from molecule A to molecule B. Then velocity of molecule A decreases, and molecule B increases. Thus statement is correct.
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