G2 Separation Techniques and Methods of Purification

To separate a soluble solid from an insoluble solid, which method is used?

• Filtration

• Using suitable solvents

• Distillation

• Evaporation

The bulb of the thermometer in a distillation set-up should be placed beside the ______ of the flask.

• top

• bottom

• side-arm

• middle

Simple distillation is used to separate a ______ mixture.

• solid-solid

• liquid-liquid

• solute-solvent

• gas-liquid

What is the purpose of a fractionating column in the distillation process?

• To provide surface area for repeated boiling and condensation

• To heat the mixture

• To cool the mixture

• To separate solids from liquids

In the distillation of ethanol and water, which liquid distills over first?

• Ethanol

• Water

• Both at the same time

• Neither

The fractionating column allows for repeated ________ and condensation.

• boiling

• cooling

• freezing

• melting

Simple distillation is used to obtain a liquid from a ________ mixture.

• liquid-liquid

• soluble solid-liquid

• gas-liquid

• immiscible liquid

What is the characteristic of a pure solid in terms of melting point?

• Fixed melting point

• Range of melting points

• No melting point

• Variable melting point

What happens to the melting point of a substance when an impurity is present?

• Increases

• Decreases

• Remains the same

• Disappears

In chromatography, a pure substance will appear as ________.

• multiple spots

• one spot

• no spots

• a line