CHEM 120 FINAL PAPER PRACTICE QUESTIONS WITH VERIFIED ANSWERS PACKAGE

CHEM 120 FINAL PAPER PRACTICE
QUESTIONS WITH VERIFIED ANSWERS
PACKAGE

●● equation for enthalpy of a solution
Answer: Hslon = Hsolv + Hsolu + Hmix
Hmix = exothermic
H solv & Hsolu = endothermic
Hsoln = Hlattice + Hhydr
lattice is always positive
hydration is always negative


●● exothermic enthalpy of a solution
Answer: Hsoln < 0
Hmix > Hsolv + Hsolu


●● endothermic enthalpy of a solution
Answer: Hsoln > 0
Hmix < Hsolv + Hsolu


●● Henry's Law

,Answer: S = k*P


●● molality
Answer: mol solute / kg of solvent


●● mole fraction
Answer: mol solute / mol of solute + solvent


●● Freezing point depression
Answer: (FPsolvent - FPsolution) = T = imKf


●● boiling point elevation
Answer: (BPsolution - BPsolvent) = T = imKb


●● relationship between solubility and vapor pressure
Answer: as vapor pressure increases, solubility decreases and vice versa


●● raoult's law
Answer: ΔP = mole fraction solvent & Partial pressure solvent


●● osmotic pressure (pi)
Answer: pi = MRT

, R = 0.0821
T = temperature in kelvin


●● how to solve for Δs, H, G rxn
Answer: ΔSrxn = S product - S reactants
same for G and H, just switch out variables


●● When does entropy increase
Answer: higher temperature
larger volume
more complex molecules
heavier molecules
increases in mols of gas
gas>liquid>solid
more gasses on product side
more product molecules than reactants


●● How to solve for ΔS uni
Answer: ΔSuni = Ssurr + Ssys


●● ΔSuni > 0
Answer: spontaneous