Chemistry B Unit 2 Test Review

In a solution, the substance that is being dissolved is the ______________.

• solvent

• solute

• colloid

• suspension

What is NOT a way to increase the rate of dissolving for a solid in a solution?

• increase surface area of the solid

• increase temperature of the solution

• stir the solution

• decrease the surface area of the solid

According to the graph, as the temperature of the solution increases, the solubility of the gas __________________.

• increases

• decreases

• stays the same

As the pressure above the gas increases, the solubility of the gas _______________________.

• increases

• decreases

• stays the same

A solution that contains more solute than a saturated solution and has the tendency to crystallize and precipitate.

• unsaturated

• saturated

• supersaturated

The solubility of NaClis 40g/100 grams of water at 20 degrees Celsius. What is the maximum amount of NaCl that can dissolve in 300 grams of water at 20 degrees Celsius?

• 40 grams

• 80 grams

• 120 grams

• 160 grams

A colligative property depends only on __________________.

• the identity of the solute particles

• the number of solute particles

• the identity of the solvent particles

• the number of the solvent particles

Why does a solute lower the vapor pressure of a substance?

• Solute particles increase the number of solvent particles that are able to escape the liquid.

• Solute particles decrease the number of solvent particles that are able to escape the liquid.

Which solution has the lower vapor pressure and why?

• Solution 2, because it has more ionized solute particles.

• Solution 2, because it has less ionized solute particles.

• Solution 3, because it has more ionized solute particles.

• Solution 3, because it has less ionized solute particles.

What is the formula for molarity?

• Molarity = moles of solute x liters of solution

• Molarity = moles of solute / liters of solution