19. Kinetic molecular theory and gasses
Questions And Answers 2022-2023
Update
What is a gas - Answer-A gas consists of particles that are spaced out. They have an
indefinite shape and indefinite volume, and are miscible with any other gas.
What are 4 gas properties - Answer-1. Gasses exert pressure on their surroundings and
are compressible
2. Gasses have matter, therefore they have a mass, but a very low density
3. Gasses always fill the container they're in (Particles expand until the concentration of
gas is uniform throughout the entire space)
4. Gasses have a lot of energy and a high velocity
1st KMT assumption - Answer-The molecules in a gas take up a negligible amount of
space in relation to the container/space they occupy
2nd KMT assumption - Answer-The particles in a gas move in constant random motion..
Particles only change path when they collide with another particle of on the side of the
container it's in
3rd KMT assumption - Answer-All collisions a gas particle undergoes are perfectly
elastic. No energy is lost or gained from one particle from another, and the total kinetic
energy remains constant
Brownian motion - Answer-Observed random movement of particles
What is pressure - Answer-The force per unit area
How do you describe a gas sample - Answer-Amount of gas (moles), volume,
temperature, and pressure
KMT of gasses - Answer-A gas consists of molecules of mass and move in contant,
random motion
Gas molecules are so far apart that they can be treated as having no volume
Collisions are elastic; so total kinetic energy of molecules remains constant
The average kinetic energy is proportional to the kelvin temperature of gas
STP and SATP - Answer-TP: 273K and 101.3kPa
SATP: 298K and 100kPa
What did Evangelista Torricelli discover - Answer-The barometer, an instrument that
measures atmospheric pressure
