Colligative properties practice

Colligative properties practice

Review of chapter 12C material

Compare Vapor Pressure and Boiling point

The lower the vapor pressure the harder it is to boil something. Anything that lowers the vapor pressure raises the boiling point.

Multiple Choice

Anything that blocks the solvent escaping lowers the vapor pressure. Boiling happens when vapor pressure = atmospheric pressure. Which has a higher boiling point?

• The pure liquid

• The liquid with a solute (non- volatile... meaning less likely to become a gas)

Multiple Choice

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

• the same as
• lower than
• higher than
• no relation to

Multiple Choice

This graph represents a(n) ___ solution

• saturated
• supersaturated
• unsaturated
• undefined

Multiple Choice

When no more sugar will dissolve in a glass of water, the solution is

• unsaturated
• saturated
• supersaturated
• suspended

Multiple Choice

This solution would be considered

• Unsaturated
• Supersaturated
• Saturated
• Undefined

Multiple Choice

What does it mean to be "Soluble" ?

• Capable of being a solid.
• To have soul.
• Capable of being dissolved.
• To sink.

Multiple Choice

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

• higher than
• the same as
• lower than
• higher or lower than

Multiple Choice

A substance that is not soluble in a polar solvent is most likely

• nonpolar.

• ionic.

• polar.

• hydrogen bonded.

Multiple Choice

The _____ is the thing being dissolved.

• solute

• solvent

Multiple Choice

True or False? The higher the concentration of a solution the less solutes it has in it.

• True
• False

Multiple Choice

Which sweet tea would you expect to taste the sweetest?

• 1M

• 3M

• 3.1M

• 2.5M

Multiple Choice

molality is defined as ________________________

• the moles of solute per kilogram of solvent

• moles of solute per liter of solution

• mass of solute/ mass of solution

• mass of solute/ mass of solvent X 100

Multiple Choice

Molality (m) = moles of solute / _________________________.

• kilogram of solvent

• kiloliter of solvent

• kilometer of solvent

• ounces of solvent

Multiple Choice

Since "like dissolves like", water and oil will not mix because

• both of them are polar

• both of them are nonpolar

• oil is polar and water is nonpolar

• oil is nonpolar and water is polar

Multiple Choice

Which of the following is the correct formula for calculating molarity?

• moles/liters of solution

• moles/kg of solvent

• # particles/Avogadro's #

• theoretical yield/actual yield

Multiple Choice

What is the "i" value in the equation

 $\Delta T\ =\ i\ Kb\ m$  

• The number of pieces the solute falls apart into

• i stands for ionic

Multiple Select

The higher the i value the

• lower the boiling point

• higher the boiling point

• lower the freezing point

• higher the freezing point

Fill in the Blank

What is the i value for covalent molecules?

Multiple Choice

What is the i value for NaCl

• 1

• 2

• 3

Multiple Choice

What is the i value for CaBr₂?

• 1

• 2

• 3

• 4

Multiple Choice

Which has the LOWEST boiling point at 1 atm pressure? (Think about i values.)

(a) 0.1 M KCl

(b) 0.1 M Urea

CH₄N₂O

(c) 0.1 M CaCl₂

(d) 0.1 M AlCl₃

• D

• A

• B

• C

Multiple Choice

. Which has the highest freezing point? (Think about i values)

(a) 1 M glucose C₆H₁₂O₆

(b) 1 M NaCl

(c) 1 M CaCl₂

(d) 1 M AlF₃

• A

• B

• C

• D

Multiple Choice

Which of the following aqueous solutions should have the highest boiling point? [NCERT Exemplar]

(a) 1.0 M NaOH

(b) 1.0 M Na2SO4

(c) 1.0 M NH4NO3

(d) 1.0 M KNO3

• A

• B

• C

• D

Multiple Choice

What is the molarity of 4 grams of sodium chloride in 3,800 mL of solution?

• 0.018 M
• 0.018 mol
• 1.052 M
• 1.052 mol

Multiple Choice

Which equation is used to find molarity?

• Moles solute/L solution

• Moles solute/kg solution

• Moles solute/kg solvent

• Grams solute/L solution

Multiple Choice

How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL? (Set up the proportion and solve. Look at your notes for chapter 12.11.)

• 1074 mol

• 0.069 mol

• 1.07 mol

• 62.7 mol

Multiple Choice

Which equation is used to find molality?

• Moles solute/L solution

• Moles solute/kg solution

• Moles solute/kg solvent

• Grams solute/L solution

Multiple Choice

Which equation is used to find molarity?

• Moles solute/L solution

• Moles solute/kg solution

• Moles solute/kg solvent

• Grams solute/L solution

Multiple Choice

What is the molality of a solution made by dissolving 2 moles of NaOH in 400 grams of water?

• 5 mol/kg. solvent

• 4 mol/kg solvent

• 3 mol/kg. solvent

• 2.5 moles /kg solvent