Unit 10-11: Gases Flashcards
The KMT is based on the idea that…
Particles of matter are always in motion
What is an ideal gas?
An imaginary gas that perfectly fits all the assumptions of the KMT
What are the 5 assumptions of the KMT
1) Gases consist of a large number of tiny particles that are far apart relative to their size
2) Collisions between gas particles and between particles and container walls are elastic collisions
3) Gas particles are in continuous, rapid, random motion.
4) There are no forces of attraction or repulsion between gas particles.
5) Average KE depends on the Temperature of the gas.
Gases that conform the most to the KMT are…
small and non-polar because they have the least intermolecular attractions.
What is a Real gas?
a gas that does not behave according to the assumptions of the KMT
When are Real gases most ideal?
Most ideal at low pressure and high temperatures.
Expansion
gases do not have a definite volume; they completely fill any container.
Low density
particles are very far apart
Fluidity
gas particles glide easily past one another
Compressibility
the volume can be greatly decreased
Diffusion
Spontaneous mixing of particles of 2 substances caused by random motion.
Ex: smell of food!
Effusion
A Process by which gas particles pass through a small or tiny opening
Pressure
force per unit area on a surface
Pressure =
force/area
Barometer
device used to measure atmospheric pressure.
