Colligative

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

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

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

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

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

Tags

NGSS.HS-PS3-4

Compared to the freezing point of 1.0 M KCl(aq) at standard pressure, the freezing point of 1.0 M CaCl₂(aq) at standard pressure is

• lower

• higher

• the same

Which of the following compounds will be most effective in melting the ice on the roads when the air temperature is below zero?

• sodium iodide (NaI)

• magnesium sulfate (MgSO₄)

• potassium bromide (KBr)

• all will be equally effective

Tags

NGSS.HS-PS3-4

Which of the following solutions will have the lowest freezing point? (Hint: who makes the most particles when dissolved?)

• 1.0 M C₁₂H₂₂O₁₁

• 1.0 M LiCl

• 1.0 M Na₃P

• 1.0 M MgF₂

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

• more than

• less than

• equal to

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

•  concentration; identity

• identity; concentration

• reactivity; nature

• nature; reactivity

Adding a nonvolatile solute to a liquid will ___.

• depress both the freezing point and the boiling point

• elevate both the freezing point and the boiling point

• depress the freezing point and elevate the boiling point

• elevate the freezing point and depress the boiling point

Electrolytes have a greater effect on colligative properties than nonelectrolytes do because electrolytes

• are volatile

• have higher boiling points

• produce fewer moles of solute particles per mole of solvent

• produce more moles of solute particles per mole of solvent

What mass of solute is needed to make 100.0 g of a 3.4% solution?

• 3.4 g

• 34 g

• 2941 g

• 0.34 g

Which of the following is a colligative property?

• Boiling point elevation

• Viscosity

• Surface tension

• Density