Colligative properties Makeup Quiz

What is the name for a substance that dissolves in water but does not form ions or conduct an electric current?

• nonelectrolyte

• electrolyte

• insoluble

• saturated

• None of them

If 4.27 g sucrose (C12H22O11) are dissolved in 15.2 g water, what is the boiling point of the resulting solution? Kb for water = 0.512°C/m. ΔTb = i x Kb x m.

• 100.42 ^oC

• 10.42 ^oC

• 100 ^oC

• 42 ^oC

• None of them

Colligative properties are dependent only on the number of particles in a solution, and not their identity.

• True

• False

Colligative properties are not dependent on the number of particles in a solution, but their identity.

• True

• False

Colligative properties are dependent only on the number of particles in a solution, and not their identity. (Select all that apply)

• Lowering of vapor pressure.

• Elevation of boiling point.

• Depression of freezing point

• Osmotic pressure

• Molarity

The change in the vapor pressure that occurs when a solute is added to a solvent is therefore a colligative property.

• True

• False

Examples of colligative properties include vapor pressure lowering, freezing point depression, osmotic pressure, molarity, molality, and boiling point elevation

• True

• False

Molality, also called molal concentration, is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent.

• True

• False

Antifreeze works because the freezing and boiling points of liquids are “colligative” properties. This means they depend on the concentrations of “solutes,” or dissolved substances, in the solution.

• True

• False

The basic law governing the colligative properties of solutions is Raoult’s law. Raoult’s law explains the relationship between the vapour pressure of the solution, mole fraction and vapour pressure of the solvent. This can be given as:

• p₁= x₁p₁^o

• ▲T = ik_bm

• ▲T = ik_fm

• Π = MRT