CHE005 LAS 4 Quiz

What is the basic principle behind distillation?

• Different liquids have different viscosities

• Different liquids have different boiling points

• Different liquids have different densities

• Different liquids have different refractive indices

TRUE OR FALSE: Distillation separates a mixture based on differences in boiling points.

• True

• False

What is the purpose of the condenser in a distillation setup?

• To heat the mixture further

• To cool and convert vapors back into liquid

• To mix the liquids evenly

• To separate non-volatile impurities

TRUE OR FALSE: Fractional distillation is best used when the components in a mixture have significantly different boiling points.

• True

• False

Which type of distillation is most appropriate for purifying heat-sensitive compounds?

• Simple distillation

• Fractional distillation

• Steam distillation

• Direct distillation

TRUE OR FALSE: Vacuum distillation is used to lower the boiling point of liquids by reducing the pressure.

• True

• False

When purifying a heat-sensitive liquid, which technique helps avoid decomposition?

• Direct heating

• Indirect heating (using a water bath)

• Increasing the pressure

• Using a fractionating column

TRUE OR FALSE: It is advisable to use direct flame heating for liquids that decompose upon overheating.

• True

• False

In a mixture of a volatile compound A and a nonvolatile compound B, which component is expected to distill?

• Compound B, because it has a higher boiling point

• Compound A, because it has a lower boiling point

• Both compounds simultaneously

• Neither; distillation does not separate based on volatility

TRUE OR FALSE: Refluxing involves continuously condensing and returning the vapors to the reaction flask.

• True

• False