Question 1

Calculate the freezing point of a solution made from 32.7 g of propane, C₃H8, dissolved in137.0 g of benzene, C₆H6. The freezing point of benzene is 5.50° C and its Kf is 5.12° C/m.

Accepted Answer

33.3

Question 2

For a 0.222 m aqueous solution of sucrose, C₁₂H₂₂O₁₁, What is the boiling point elevation? K_b = 0.512˚C/m

Accepted Answer

0.114

Question 3

The freezing point of a solution is ____ the freezing point of the pure solvent.

Accepted Answer

lower than

Answer

higher than

Answer

no relation to

Answer

the same as

Question 4

The boiling point of a solution is ______ the boiling point of the pure solvent.

Accepted Answer

higher than

Answer

lower than

Answer

higher or lower than

Answer

the same as

Question 5

The vapor pressure of a pure solvent is ___________ that of a solution.

Accepted Answer

more than

Answer

equal to

Answer

the same to

Answer

less than

Question 6

Colligative properties depend on the _________ of the solute but not the __________ of the solute.

Accepted Answer

concentration; identity

Answer

reactivity; nature

Answer

identity; concentration

Answer

nature; reactivity

Question 7

While making homemade ice cream, you add rock salt to the ice. Which choice below provides the best explanation for why this is done?

Accepted Answer

Adding salt to the ice will lower the freezing point by creating a solution that's freezing point is lower than just the ice.

Answer

Adding salt to the ice will lower the freezing point by creating a solution that's freezing point is higher than just the ice.

Answer

Adding salt to the ice will raise the freezing point by creating a solution that's freezing point is lower than just the ice.

Answer

Adding salt to the ice will raise the freezing point by creating a solution that's freezing point is higher than just the ice.

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