AnswersChemistryColligative Properties

Colligative Properties — Quiz Answers

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A group of students is in the laboratory performing an experiment on the effect of adding salt to water. Which observation are students likely to make as they increase the molality of the saltwater solution?

A
As the molality increases by 1 m , there is an initial decrease of 1 point 8 6 times degree C followed by an increase of 1 point 8 6 times degree C in the solution’s freezing point.
B
As the molality increases by 1 m , there is no observable change in the solution’s freezing point.
C
As the molality increases by 1 m , there is a corresponding decrease of 1 point 8 6 times degree C in the solution’s freezing point.
D
As the molality increases by 1 m , there is a corresponding increase of 1 point 8 6 times degree C in the solution’s freezing point.
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Which statement about electrolytes and nonelectrolytes is not true?

A
Electrolytes disperse as molecules in a solution.
B
Nonelectrolytes include cap c sub 6 cap h sub 12 cap o sub 6 and cap c sub 6 cap h sub 6 .
C
Nonelectrolytes include all molecular compounds that do not have a full charge.
D
Electrolytes dissociate into ions in the solution.
43

How are the boiling point and freezing point of a solvent affected when a solute is added?

A
The boiling point decreases, and the freezing point increases.
B
Both the boiling point and the freezing point increase.
C
Both the boiling point and the freezing point decrease.
D
The boiling point increases, and the freezing point decreases.
44

The freezing point of pure chloroform is negative 63 point 5 times degree C , and its freezing point depression constant is 4 point 0 7 times degree C times kg/mol If the freezing point of a solution of benzoic acid in chloroform is negative 70 point 5 5 times degree C , what is the molality of this solution? Use triangle cap t sub f is equal to cap k sub f m

A
1 point 7 m
B
16 m
C
17 m
D
0 point 5 8 m
45

A set of four 15 point 0 - mL solutions—each in a similar open dish—was left at room temperature, and the amount that remained was recorded after every hour. Which of the solutions do you expect to be the first to completely evaporate from the open dish?

A
1 point 5 m NaOH
B
0 point 2 5 m Na sub 2 SO sub 4
C
1 point 0 m NaOH
D
0 point 5 m Na sub 2 SO sub 4
46

Which of the following is a nonelectrolyte?

A
Na sub 2 SO sub 4
B
Ag times open paren cap c sub 2 cap h sub 3 cap o sub 2 close paren
C
Pb open paren NO sub 3 close paren sub 2
D
cap c sub 6 cap h sub 12 cap o sub 6
47

The osmotic pressure of a solution increases as

A
the boiling point of the solution decreases.
B
the amount of solvent in the solution increases.
C
the number of particles of solute in the solution increases.
D
the freezing point depression constant of the solution decreases.
48

Which of the following is a nonelectrolyte?

A
Na sub 2 SO sub 4
B
cap c sub 6 cap h sub 12 cap o sub 6
C
Pb open paren NO sub 3 close paren sub 2
D
Ag times open paren cap c sub 2 cap h sub 3 cap o sub 2 close paren
49

The freezing point of pure chloroform is negative 63 point 5 times degree C , and its freezing point depression constant is 4 point 0 7 times degree C times kg/mol If the freezing point of a solution of benzoic acid in chloroform is negative 70 point 5 5 times degree C , what is the molality of this solution? Use triangle cap t sub f is equal to cap k sub f m

A
0 point 5 8 m
B
16 m
C
1 point 7 m
D
17 m

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Colligative Properties — Quiz Answers — Chemistry