Solutions Practice Exam 2015
These are just a few sample questions. Study your notes. Know your vocabulary and all formulas. Look over
all old worksheets as you study for this exam.
1. If 4.50 g of lithium iodide is added to 150. g of water, what is its molality and new boiling point?
2. Why are polar solvents able to dissolve polar or charged solutes while non polar solvents cannot?
3. Describe the effects of temperature and pressure on the solubility of gases in liquids?
4. Give an example of a specific compound that you would expect to dissolve in a polar solvent.
5. What information can be gained from a solubility curve?
6. List two factors that affect the rate of dissolving but do not affect the solubility of a substance.
7. What does it mean if a substance is an electrolyte?
8. Describe how you would make 250 mL of a 0.123 M solution of sodium hydroxide. Be sure to include all
pertinent numbers for measurements in your explanation.
9. Explain what happens when you add an extra crystal to a saturated, unsaturated and supersaturated
solution.
saturatedunsaturatedsupersaturated10. Circle all of the following that you would expect to dissolve in a non polar solvent?
CH4
NaI
SF2
C3H8
11. Work the following calculations. Be careful between molarity and molality.
a) How many grams of MgCl2 are needed to make 600 mL of a 3.5 M solution?
b) What is the molarily of a 125 g solution containing 3.5 grams of KI?
12. How many mL of water is needed to make 250 mL of 0.10 M HCl solution from a 3.0 M HCl solution?
13. Draw an example of an ionic solute dissolving in water.
14.
Which produces the greatest number of ions when one mole dissolves in water?
a. NaCl b. NH4NO3
c. NH4Cl
d. Na2SO4 e. sucrose
15.
For an aqueous solution of a nonvolatile compound, the vapor pressure will be _____, the boiling point
will be _____, and the freezing point will be _____ than for pure water.
a. lower, lower, lower
b. lower, higher, lower
c. lower, higher, higher
d. higher, higher, lower
e. higher, lower, higher
16.
The phrase "like dissolves like" refers to the fact that ____________.
a. gases can only dissolve other gases
b. polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes
c. solvents can only dissolve solutes of similar molar mass
d. condensed phases can only dissolve other condensed phases
e. polar solvents dissolve nonpolar solutes and vice versa
17.
Which one of the following substances would be the most soluble in CCl4?
a. CH3CH2OH b. H2O
c. NH3
d. C10H22 e. NaCl
18. Describe how the number of solute particles will affect boiling point, vapor pressure and freezing point.