# UNIT 10 - GASES

KINETIC MOLECULAR (K-M) THEORY OF MATTER (p. 385 – 387 & p. 419 – 420 in text book)
- based on the idea that particles of mattter are always in motion
- assumptions of the K-M Theory
1.)
Gases consist of large numbers of tiny particles that are far apart relative to their size.
This means that _________________________________________________________
______________________________________________________________________

2.) Collisions between gas particles and between particles and container walls are elastic
collisions.  This means that ________________________________________________
______________________________________________________________________
______________________________________________________________________

3.) Gas particles are in constant, rapid, random motion.
This can be inferred because ______________________________________________

4.) There are no forces of attraction or repulsion between gas particles.
This means that _________________________________________________________
_______________________________________________________________________
_______________________________________________________________________

5.) The average kinetic energy of gas particles depends on the temperature of the gas.
This means that _________________________________________________________
_______________________________________________________________________

- GASES BEHAVE NEARLY IDEALLY UNDER CONDITIONS of _________ temperature,
_________ pressure, & _________ molar mass.

PROPERTIES OF GASES
- In order to fully describe a gas, four measurable quantities must be stated.
* PRESSURE:  ________________________________________________
units:  1 atm = _____ mm Hg = _____ torr = _____ kPa = _____ Pa
measured with a ___________________

* TEMPERATURE:  ____________________________________________
units:  degrees Celsius (oC), Kelvins (K), or oF (oF not usually used in class)
how to convert from oC to K?____________________________________

** “STP” stands for “Standard Temperature and Pressure”.  The conditions at STP are exactly 1 atm pressure and exactly 0 oC. **

* VOLUME:  _________________________________________________
units:  1 Liter (L) = _____ mL = _____ cm3 = _____ dm3

* QUANTITY:  _______________________________________________
units:  moles        how to convert from grams to moles? __________________