Chemistry Lect 2
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How much space will 1 mol of gas occupy at STP
 22.4 L
 STP: 0° C and 1 atm

At lower temps, dense gasses ___.
settle below less dense gases

Ideal Gas Law:
 PV = nRT
 R: 0.08206 L atm/K/mol

Ideal Gases
 Make completely elastic collisions
 Exert no forces except to repulsive forces due to collisions
 Molecules have zero volume
 The ave kinetic energy is directly proportional to the temp of the gas

Kinetic Energy Equation for Ideal Gases
K.E. = 3/2 RT

Velocity of Ideal Gas Molecules
 v_{1}/v_{2} = sqrt(m_{2}) / sqrt(m_{1})
 m: mass of the gas molecules

Diffusion/Effusion Rate
 Eff Rate_{1} / Eff Rate_{2} = sqrt (M_{2}) / sqrt (M_{1})
 M: molecular weight

What causes deviation from ideal gas behavior?
Increased Pressure and Decreased Temps

Chemical Kinetics vs. Thermodynamics
 Kinetics: how fast equilibrium is reached
 Thermodynamics: what equilibrium looks like

What are reaction rates dependent on?
 Temp, Pressure, and Concentration
 T.P.C.

Equilibrium
 the point of greatest entropy
 there is no net change in concentration
 K_{eq} = products / reactants

Increasing temp ___ the solubility of a salt.
 Increases
 This is always true, even if the rxn is exothermic