Comparing rock salt with table salt (non-statutory) | Science

Starter quiz

Solids and gases that dissolve in water are said to be ______ in water.
- 'soluble' ✓
How can you separate an insoluble solid from a liquid?
- evaporation
- sieving ✓
- filtering ✓
- melting
What do you get if you dissolve a soluble solid in a liquid?
- a solution ✓
- a mixture
- a cloud
- an evaporation
If a change is ______, it can be undone or changed back to its original state.
- 'reversible' ✓
How can you separate a soluble solid from a liquid?
- evaporation ✓
- sieving
- filtering
- melting
How can you speed up evaporation of a liquid?
- shake it
- heat it ✓
- cool it
- burn it

What is the name of the salt people put on their food or in their cooking?
- food salt
- baking salt
- table salt ✓
Which of these pieces of equipment could be used to observe and compare different types of salt?
- torch
- ruler
- hand lens ✓
- microscope ✓
Which of these are ways you can obtain table salt?
- growing salt
- mining salt deposits ✓
- filtering seawater
- evaporating seawater ✓
What is the name of salt when it comes out of a mine?
- rock salt ✓
- mine salt
- lump salt
- volcanic salt
What do you call salt obtained by evaporating sea water?
- rock salt
- sea salt ✓
- water salt
- ocean salt
What can table salt be used for?
- to improve the flavour of food ✓
- to sweeten food
- to preserve food ✓

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The salt people put on their food or in their cooking is usually a type of salt called table salt.
Table salt has a wide range of uses.
Table salt can be obtained through two main methods: mining underground salt deposits and evaporating seawater.
Different types of salt can be observed and compared using a hand lens or microscope.

Pupils may think that there is only one type of salt and that it all comes from the sea.

Teaching slides explain how salt is produced and introduce pupils to rock salt and table salt. Pupils make a comparison of the two.

Table salt - The salt people put on their food or in their cooking is usually a type of salt called table salt.
Processed - If something is processed, it is changed from its natural form by people.
Salt mines - Salt mines are areas of Earth from which rock salt is extracted. These are often underground.
Rock salt - Rock salt is the name given to salt before it is processed.
Microscope - A microscope is a piece of equipment that magnifies very tiny objects.