The effect of adding salt to ice: plan (non-statutory) | Science

Starter quiz

What kind of salt do people usually put on their food?
- rock salt
- sea salt ✓
- table salt ✓
What can table salt be used for?
- adding flavour to food ✓
- making drinks sweeter
- making bread dough stronger ✓
What is rock salt?
- Rock salt is the name given to salt before it is processed. ✓
- Rock salt is the name given to salt before it is sold in a shop.
- Rock salt is the name given to salt before it is mined.
What are the main ways in which can table salt be obtained?
- from underground mines ✓
- evaporating pond water
- evaporating seawater ✓
- from underwater mines
Which pieces of equipment would be useful to observe different types of salt?
- microscope ✓
- binoculars
- telescope
- handheld lens ✓
What is a variable?
- something that can be changed in an investigation ✓
- something that can be measured in an investigation ✓
- something that can be predicted in an investigation
- something that can be recycled in an investigation
- something that can be kept the same in an investigation ✓

Where is rock salt often stored so it can be used on our roads and pavements?
- in a rubbish bin
- at the dump
- in a grit bin ✓
What can rock salt be used for?
- making food taste better
- melting ice on roads or pavements ✓
- making bread dough stronger
After being mined, but before it can be transported to grit bins, rock salt has to be ...
- washed and mixed.
- cleaned and baked.
- processed and crushed. ✓
Why do scientists plan investigations?
- to show off their knowledge to others
- to use different pieces of equipment
- to answer questions ✓
- to make comparisons ✓
Which of these statements is true?
- Variables can be changed in an investigation. ✓
- Variables cannot be changed in an investigation.
- Variables can be measured in an investigation. ✓
- Variables cannot be measured in an investigation.
- Variables can be kept the same in an investigation. ✓
Which variable is changed in an investigation to find out which type of salt melts ice the fastest?
- the amount of ice
- the type of salt ✓
- the size of the cup or beaker

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Rock salt is often stored in a public grit bin and used to melt ice on roads and pavements.
After being extracted, rock salt usually undergoes processing and crushing before it is transported to grit bins.
Scientists plan investigations to make comparisons and answer questions.
Variables can be changed, measured or kept the same in a comparative test.

Pupils may think that there is only one type of salt.

Explanation that rock salt is one type of salt.

Rock salt - Rock salt is the name given to salt before it is processed.
Grit - Rock salt is a brown colour and looks like gravel, so it is often referred to as grit.
Melt - To melt is to change from a solid state to a liquid state.
Comparative test - In a comparative test, the thing that is being changed has labels, such as the types of materials.
Variable - Variables are the things that can be changed, measured or kept the same in a comparative test.