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Year 6

Comparing rock salt with table salt (non-statutory)

I can use a hand lens or microscope to observe and compare rock salt and table salt.

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New
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Year 6

Comparing rock salt with table salt (non-statutory)

I can use a hand lens or microscope to observe and compare rock salt and table salt.

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Lesson details

Key learning points

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

Keywords

  • 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.

Common misconception

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.


To help you plan your year 6 science lesson on: Comparing rock salt with table salt (non-statutory), download all teaching resources for free and adapt to suit your pupils' needs...

Encourage pupils to remember the method used to separate soluble solids from solutions before telling them how sea salt is obtained.
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Teacher tip
equipment-required

Equipment

rock salt, table salt, hand lenses, water, beakers, spoons, microscopes (primary friendly) if available.

content-guidance

Content guidance

  • Risk assessment required - equipment
supervision-level

Supervision

Adult supervision required

copyright

Licence

This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

Lesson video

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6 Questions

Q1.
Solids and gases that dissolve in water are said to be in water.
An image in a quiz
Correct Answer: soluble
Q2.
How can you separate an insoluble solid from a liquid?
evaporation
Correct answer: sieving
Correct answer: filtering
melting
Q3.
What do you get if you dissolve a soluble solid in a liquid?
An image in a quiz
Correct answer: a solution
a mixture
a cloud
an evaporation
Q4.
If a change is , it can be undone or changed back to its original state.
Correct Answer: reversible
Q5.
How can you separate a soluble solid from a liquid?
Correct answer: evaporation
sieving
filtering
melting
Q6.
How can you speed up evaporation of a liquid?
An image in a quiz
shake it
Correct answer: heat it
cool it
burn it

6 Questions

Q1.
What is the name of the salt people put on their food or in their cooking?
An image in a quiz
food salt
baking salt
Correct answer: table salt
Q2.
Which of these pieces of equipment could be used to observe and compare different types of salt?
torch
ruler
Correct answer: hand lens
Correct answer: microscope
Q3.
Which of these are ways you can obtain table salt?
An image in a quiz
growing salt
Correct answer: mining salt deposits
filtering seawater
Correct answer: evaporating seawater
Q4.
What is the name of salt when it comes out of a mine?
An image in a quiz
Correct answer: rock salt
mine salt
lump salt
volcanic salt
Q5.
What do you call salt obtained by evaporating sea water?
rock salt
Correct answer: sea salt
water salt
ocean salt
Q6.
What can table salt be used for?
An image in a quiz
Correct answer: to improve the flavour of food
to sweeten food
Correct answer: to preserve food
Q4 Superchilum/Wikimedia Commons Images

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