Chemistry Test Solutions 2

Question 1

Which colligative property describes the increase in boiling point when a solute is dissolved in a solvent?

Accepted Answer

Boiling point elevation

Answer

Boiling point elevation occurs because dissolved solute particles lower the vapor pressure, requiring a higher temperature to reach atmospheric pressure.

Question 2

What is the molality of a solution containing 4.0 g of NaOH (molar mass = 40 g/mol) dissolved in 500 g of water?

Accepted Answer

0.2 m

Answer

Moles of NaOH = 4.0/40 = 0.1 mol; molality = 0.1 mol / 0.500 kg = 0.2 m.

Question 3

A solution that contains less dissolved solute than it could hold at a given temperature is called:

Accepted Answer

Unsaturated

Answer

An unsaturated solution has not reached its maximum solute capacity and can dissolve more solute.

Question 4

Which factor does NOT significantly affect the rate of dissolution of a solid solute in a liquid solvent?

Accepted Answer

Color of the solute

Answer

Color is a physical property that does not affect dissolution rate; stirring, temperature, and particle size all increase the rate.

Question 5

Henry's Law states that the solubility of a gas in a liquid is:

Accepted Answer

Directly proportional to the partial pressure of the gas

Answer

Henry's Law: C = kP, where gas solubility increases proportionally with the partial pressure of the gas above the liquid.

Chemistry Practice Test

Chemistry Practice Test

Chemistry Test Solutions 2