Kinetic Model of Matter Flashcards
How is gas pressure created in containers?(in a container)
Gas particles collide with the walls of the container and exert a force. This force exerted per unit area creates pressure.
When temperature increases, what happens to pressure?(in a container)
When temperature increases, the kinetic energy and speed of molecules also increase. This causes the frequency of collisions of molecules with wall and the total force of collision of molecules with wall to increase. As such, the force exerted per unit area on wall increases.
What happens to pressure when volume increases?(in a container)
When volume increases, the number of molecules per unit volume decreases. This leads to a decreased frequency of collision of molecules with walls and a decrease in total force of collision of molecules with wall. As such the force per unit area exerted on wall decreases.
What happens to volume when temperature increases? (in a container)
When temperature increases, the kinetic energy and speed of molecules increase. This causes the frequency of collision of molecules with walls and the total force of collision of molecules with wall to increase, resulting in a higher force per unit area exerted on the walls. (Pressure increase)
Since internal pressure is now higher than external pressure, this pressure pushes the piston outwards, causing the volume of the gas to increase until the internal pressure and the external pressure are equal.
What happens to the pressure when the number of molecules is increased?(in a container)
The number of molecules per unit volume increases. This results in a higher frequency of collision of molecules with walls and an increased total force of collision of molecules with walls. As such, the force exerted per unit area on the walls increases (Pressure increases)
