KS3 Y8 Pure and Mixtures

Gap-fill exercise.

Name:_________________________Class:___________________Date:__________________

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button if available to get a clue. Note that you will lose points if you ask for hints or clues!
   dissolves      excellent solvent      good      lot of minerals dissolved      mixture      molecules      nitrogen      not as      only one      other gases      oxygen      pure      Pure      Seawater   
8Fd Pure and Mixtures

In chemistry a substance contain substance alone and nothing else.

water for example contains only of water

There is a lot of water on the earth but they are not said to be because water is an .

It a lot of salt in it. especially has a lot of salt.

The water we drink is also a with a . They are necessary for our health. This water is salty as seawater.

The air we breathe is also a . It contains about 21% and 78% and in small amounts.