Chem 106 ACS final Questions and Correct Answers/ Latest Update / Already Graded

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Chem 106 ACS final Questions and Correct
Answers/ Latest Update / Already Graded
Molality (m)

Ans: mol solute/kg solvent


Molarity (M)

Ans: moles of solute/liters of solution


Mole fraction

Ans: moles of A/(moles of A + moles of B)


volume percent

Ans: (ml solute/ml solution) x 100


mass percent

Ans: (g solute/g solution) x 100


London Dispersion Forces




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Ans: constant motion of electrons and the creation of
instantaneous dipoles


Dipole-dipole forces

Ans: attractions between oppositely charged regions of polar
molecules


Hydrogen bonds

Ans: weak attraction between a hydrogen atom and another
atom


Like-Dissolves-Like

Ans: similar molecular structure and intermolecular forces
better homogenize


solubility of solids and temperature

Ans: increases with increasing temperature


solubility of solids and pressure

Ans: negligible



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solubility of gases and temperature

Ans: decreases as temperature increases


solubility of gases and pressure

Ans: increases as pressure increases


Raoult's Law

Ans: p(solution) = x(solvent) x p(solvent)


boiling point elevation

Ans: ∆Tb = KbCm
Kb = boiling point constant
∆Tb = Tb(solution) - Tb(solvent)


Freezing point depression

Ans: ∆Tf = KfCm
Kf = freezing point constant
∆Tf = Tf(solution) - Tf(solvent)



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