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