Question

fall final exam: mc
an assumption of the kinetic model of an ideal gas is that each gas particle

has the same speed as all the others.

collides elastically with the container walls.

travels parallel to the container walls.

has a momentum that does not change.

Explanation:

To determine the correct assumption of the kinetic model of an ideal gas, we analyze each option:

• Option 1: Gas particles have a distribution of speeds (Maxwell - Boltzmann distribution), so they do not all have the same speed. Eliminate this option.
• Option 2: In the kinetic theory of ideal gases, collisions between gas particles and the container walls are elastic. This means that there is no loss of kinetic energy during the collision, and this is a key assumption of the kinetic model.
• Option 3: Gas particles move randomly in all directions, not just parallel to the container walls. Eliminate this option.
• Option 4: The momentum of a gas particle changes during a collision with the wall (since the direction of velocity changes, and momentum is a vector). However, the total momentum of the system (gas + walls) is conserved, but the momentum of an individual particle does change. Eliminate this option.

Answer:

The option stating "collides elastically with the container walls" (the second option among the given choices)