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Chem 102 Exam 1
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21
Chemistry
Undergraduate 2
02/17/2011

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Term
mass percent
Definition
mass of component in soln/ total mass of soln times 100%
Term
Parts per million
Definition
mass of component in soln/total mass of soln times 10^6
Term
mole fraction
Definition
moles of component/ total moles of all components
Term
molarity
Definition
moles solute/ liters soln
Term
molality
Definition
moles of solute/ kilograms of solvent
Term
saturated solution
Definition
the solvent holds as much solute as possible at that temperature
Term
unsaturated solution
Definition
less solute than can dissolve in the solvent at that temperature is dissolved in the solvent
Term
the solubility of liquids and solids _________________appreciably with pressure
Definition
does not change
Term
Sg=
Definition
kPg
Term
generally the solubility of solid solutes in liquid solvents
Definition
increases with increasing temperature
Term
generally the solubility of gas solutes in liquid solvents
Definition
decreases with increasing temperature
Term
Vapor pressure lowering (Raoult’s Law)
Definition
because the nonvolatile solute occupies part of the surface, the number of solvent molecules that can escape from the surface is less
-therefore, the vapor pressure of a solution is lower than that of the pure solvent
Term
BP elevation
Definition
deltaTb= Kb times m (molality)
Term
FP depression
Definition
deltaTf= Kf times m
Term
colloids
Definition
suspensions in which the suspended particles are larger than individual ions or molecules, but too small to separate out of the suspension by gravity
Term
Tyndall effect
Definition
-colloidal suspensions can scatter rays of light
-ex. Sunlight in the mist
Term
Arrhenius equation
Definition
k= Ae^-Ea/RT
Term
K> 1
Definition
products are favored
Term
-K> 1
Definition
reactants are favored
Term
Q>k
Definition
net change is to the left until equilibrium is reached
Term
Q
Definition
net change is to the right until equilibrium is reached
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