Chem Chpter 12 The Kinetic Molecular Theory Flashcards
(20 cards)
What are all the forms of standard pressure
1 atm=760mmHg=760 torr=101.3 kPa=14.7psi
What are the 3 characteristics of an ideal gas
- Ideal gas particles have mass, but not volume
- Ideal gas particles neither attract nor repel each other
- Ideal gas particles undergo elastic collisions, meaning the kinetic energy is the same before and after the collision
What’s the formula for average kinetic energy
KE=1/2(mass)(speed)^2
Kelvin temperature is directly proportional with what
The average kinetic energy of the particles
What’s graham’s law of effusion
(Rate 1)/(Rate 2) = sq. Root of M2 / sq. Root of M1
For a molecule to evaporate, it must
Be at the surface and have enough KE in order to break the intermolecular forces with neighboring molecules
Vapor pressure
Pressure above a liquid caused by collisions of vapor molecules with the container
The vapor pressure in a closed container at a _________ temperature is _________ because
Constant
Constant
Evaporation is equal to condensation
What is the only way to increase the vapor pressure of a liquid
Increase the temp
Molecules with what have a higher VP
Weaker IMFs
Volatile
High VP at RT
Describe the surface tension of a water droplet
Surface water molecule-unbalanced forces
Interior water molecule-balanced forces
What are the 4 types of crystalline solids
Ionic
Molecular
Metallic
Network covalent
What are the unit particles, attractive forces, and melting points of network covalent solids
Atoms
Covalent bonds
VERY high
Crystalline solids
High atomic level organization
Defined melting point
Quartz
Amorphous solid
Low atomic level organization
Range of melting points
Glass
What are endothermic phase changes
Sublimation
Vaporization
Melting
What are exothermic phase changes
Deposition
Condensation
Freezing
A liquid boils when
It’s vapor pressure equals the air pressure around the liquid
EVAPORATION IS JUST THE SURFACE
2 things coexist in equilibrium when
2 phase changes are occurring at the same time
