Y8 - topic 1 - lesson 4 (simple distillation)

What is the boiling point of pure water?

• 100^oC

• 0^oC

• 50^oC

• 150^oC

Which has the higher boiling point; water or sodium chloride (salt)?

• water

• sodium chloride (salt)

We can use a technique called ________ ___________ to obtain pure water from salty water.

During simple distillation, the mixture is heated so that the water undergoes a change of state. What state change occurs when the water is heated?

• melting

• evaporation

• condensation

• sublimation

During simple distillation, once the water has evaporated it then passes down a cooled tube called a _______________.

During simple distillation, water vapour passes along the condenser where it is cooled down. What state change occurs here?

• evaporation

• melting

• freezing

• condensation

A student is separating salty water using simple distillation. What would they expect to find at point X?

• liquid water

• solid water

• gaseous water (water vapour)

• salt

A student is separating salty water using simple distillation. What would they expect to find at point Y?

• liquid water

• solid water

• gaseous water (water vapour)

• salt