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Salt

In this worksheet, students will learn about salt from the sea and the ground, how it is extracted and what it is used for.

'Salt' worksheet

Key stage:  KS 3

Curriculum topic:   Chemistry: Pure and Impure Substances

Curriculum subtopic:   Separating Mixtures

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

If we let different samples of water evaporate, various chemicals will be left behind. These chemicals are called salts. One of them is the common table salt, but there are different types of salts.

 

Chemists test water samples in the laboratory to make sure they meet quality standards set by the government in order to ensure drinking water is safe. Hard water is found in some parts of the country; it contains chemicals that prevent soap from making foam. Water that does not contain these chemicals is called soft water. Hard water can damage appliances, like kettles and washing machines (see photograph below).

 

Scale on kettle element

 

Salt is obtained from sea water by letting the Sun's heat evaporate the water. The chemical name for common salt is sodium chloride. The photograph below shows a worker in a salt extraction area.

 


Extracting salt

 

 

Salt can also be obtained from rocks by mining or by pumping water into the ground. The water dissolves the salt making brine, i.e. salt solution. The brine is pumped back to the surface and heated to evaporate the water. The photograph shows rock salt.


Rock salt

Salts are important for a healthy diet and for preserving food. Salt used to be very valuable in the Roman Empire. 

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