Separation Techniques Lesson 2Quiz

What is the primary basis for freeze concentration as a separation technique?

• Differences in boiling point
• Differences in melting point
• Differences in density
• Differences in solubility

Which of the following statements about boiling point is true?

• It is the temperature at which a substance freezes.
• It is the temperature at which a substance melts.
• It is the transition temperature between liquid and gas.
• It is the temperature at which a solid becomes a liquid.

When separating a mixture of salt and water, which technique is most appropriate if you want to collect the salt?

• Evaporation
• Distillation
• Filtration
• Freeze concentration

In the context of separation techniques, what does the term 'volatile substance' refer to?

• A substance that does not evaporate
• A substance that evaporates easily
• A substance that freezes quickly
• A substance that is insoluble

What happens to the boiling point of water when sodium chloride is dissolved in it?

• It decreases
• It remains the same
• It increases
• It becomes unpredictable

Which separation technique would you use to separate two miscible liquids with a large difference in boiling points?

• Evaporation
• Filtration
• Distillation
• Freeze concentration

What is the main difference between evaporation and boiling?

• Evaporation occurs at a specific temperature, while boiling occurs at any temperature.
• Evaporation occurs slowly, while boiling occurs rapidly.
• Evaporation can only occur in solids, while boiling occurs in liquids.
• Evaporation is a chemical change, while boiling is a physical change.

Why is liquid nitrogen effective for making ice cream?

• It has a high boiling point.
• It has a low melting point.
• It freezes quickly.
• It evaporates slowly.

What is the purpose of a condenser in distillation?

• To heat the mixture
• To cool the gas back into a liquid
• To separate solids from liquids
• To increase the boiling point

In freeze concentration, what happens to the component with the higher melting point?

• It remains a liquid
• It evaporates
• It freezes
• It dissolves