Starter quiz
- A solid which is soluble in water will ______ in water.
- 'dissolve' ✓
- Which of these materials are soluble in water?
- sugar ✓
- salt ✓
- sand
- soil
-
Match the temperatures of water with its state: solid, liquid or gas.- below 0°C⇔solid ✓
- between 0°C and 100°C⇔liquid ✓
- above 100°C⇔gas ✓
- What is water called in its gas state?
- ice vapour
- water gas
- water vapour ✓
- smoke
-
When a solution is heated using an oil burner, what process takes place?- evaporation ✓
- condensation
- melting
-
- If you carried out evaporation on a salt solution, what would be left behind?
- salt ✓
- water
- a salt solution
- salty water
-
Exit quiz
- True or false? The water in our seas and oceans contains salt.
- True ✓
- False
- What process can we use to remove the water from a salt solution?
- freezing
- melting
- evaporation ✓
- dissolving
-
- What is the name of water in the gas state?
- 'water vapour' ✓
- Condensation is when water in the gas state is ______ so that it changes to water in the liquid state.
- heated
- cooled ✓
- dissolved
- melted
-
- Scientists and engineers investigate ways of making seawater safe to drink using...
- evaporation and condensation. ✓
- soluble and insoluble.
- grouping and classifying.
- melting and freezing.
-
- Which of these are tiny living things that must be removed from water to make it safe to drink?
- microscopes
- microwaves
- microorganisms ✓
-
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The water in our seas and oceans contains salt. This water is not safe for drinking.
- Evaporation can be used to remove the water from a salt solution.
- Condensation is when a water in the gas state (water vapour) is cooled so that it changes to water in the liquid state.
- Scientists and engineers investigate ways of making seawater safe to drink using evaporation and condensation.
- Microorganisms must also be removed from water to make it safe to drink.
Common misconception
Saltwater is safe to drink.
Teaching slides will explain that drinking saltwater can make us ill and will explain the process of desalination.
Keywords
Seawater - Seawater is water from a sea or ocean.
Solution - Some solids dissolve in liquids to form a solution.
Evaporation - Evaporation is the change of state from a liquid to a gas.
Condensation - Condensation is the change of state from a gas to a liquid.
Desalination - Desalination is the process of removing salt from seawater.
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