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Solutions Chapter 15
Test Description: Solutions, molarity, molality, mole fraction
Instructions: Answer all questions to get your test result.
1) To determine the concentration of a solution in molarity units, you need to know all of the following except
A
mass of solvent.
B
chemical formula solute.
C
total volume of solution.
D
mass of solute.
2) A solution that contains as much solute as can possibly be dissolved under the existing conditions is said to be
A
soluble.
B
saturated.
C
supersaturated.
D
concentrated.
3) Supersaturated solutions are characterized by
A
being able to exist at super-low temperatures.
B
having a larger amount of solute than can be dissolved.
C
having great stability.
D
being super hot.
4) In solution formation, energy is needed to
A
keep the solution stable
B
melt the substance
C
separate the solute particles from each other.
D
warm the solvent and solute
5) Energy is always given off in solution formation when
A
solute particles become attracted to solvent molecules.
B
solute particles separate prior to their solvation.
C
solvent molecules are forced apart in the mixing process.
D
endothermic reactions occur.
6) The energy involved in the formation of a solution will be
A
absorbed if the solution is solid.
B
given off if it is a water solution.
C
exothermic if solvation forces are higher than the forces required to separate solute particles and solvent molecules.
D
exothermic if the solution is gaseous.
7) Which of the following is not an important factor influencing solubility?
A
chemical nature of solvent
B
volume of solvent
C
temperature
D
chemical nature of solute
8) Common nonpolar solvents include all of the following except
A
salt water.
B
carbon tetrachloride.
C
hexane.
D
vegetable oil.
9) Ionic solids best dissolve liquid solvents that are
A
nonpolar.
B
polar.
C
transparent.
D
viscous.
10) Which of the following's solubility is most affected by pressure?
A
gases
B
ionic solids
C
supersaturated solutions.
D
alloys
*select an answer for all questions
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