In Class Exam 1

Question 1

Predict Values for: Polar Solute, Polar Solvent

∆H1
∆H₂
∆H₃
∆H_soln
Outcome

Answer 1

Predict Values for: Polar Solute, Polar Solvent

∆H1 - large
∆H₂ - large
∆H₃ - large, negative
∆H_soln - small
Outcome - solution forms

Question 2

Predict Values for: Nonpolar Solute, Polar Solvent

∆H1
∆H2
∆H3
∆Hsoln
Outcome

Answer 2

Predict Values for: Nonpolar Solute, Polar Solvent

∆H1 - small
∆H2 - large
∆H3 - small
∆Hsoln - large, positive
Outcome - no solution forms

Question 3

Predict Values for: Nonpolar Solute, Nonpolar Solvent

∆H1
∆H2
∆H3
∆Hsoln
Outcome

Answer 3

Predict Values for: Nonolar Solute, Nonolar Solvent

∆H1 - small
∆H2 - small
∆H3 - small
∆Hsoln - small
Outcome - solution forms

Question 4

Predict Values for: Polar Solute, Nonolar Solvent

∆H1
∆H2
∆H3
∆Hsoln
Outcome

Answer 4

Predict Values for: Polar Solute, Polar Solvent

∆H1 - large
∆H2 - small
∆H3 - small
∆Hsoln - large, positive
Outcome - no solution forms

Question 5

Pressure has ____ affect on solubilty of solids and liquids.

Answer 5

little

Question 6

Henry’s Law equation:

Answer 6

C=kP
C=concentration of dissolved gas
k=constant
P=partial pressure of gas solute above the solution

Question 7

Amount of gas dissolved in a solution is ______ proportional to the pressure of gas above the solution.

Answer 7

directly

Question 8

Solubilty of a gas in solvent typically (increases/decreases) with increasing temperature.

Answer 8

decreases

Question 9

Define volatile:

Answer 9

tendency of a substance to vaporize.

Question 10

Nonvolatile solute _______ the vapor pressure of a solvent.

Answer 10

lowers

Question 11

Raoult’s Law Equation:

Answer 11

P_soln=X_solvP°_solv

P_soln = observed vapor pressure of solution

X_solv = mol fraction of solvent

P°_solv = vapor pressure of pure solvent