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Compounds and mixtures

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Checkpoint

Can you recognise elements, compounds and mixtures?

  • An element contains just one type of atom.

  • A compound contains two or more types of atom joined together.

  • A mixture contains two or more different substances that are not joined together.

  • The different substances in a mixture can be elements or compounds.

The table shows some examples.

Description Example Diagram
Pure element oxygen oxygen atoms in pairs
Pure compound carbon dioxide Two oxygen atoms and one carbon atom joined together
Mixture of elements oxygen and helium Oxygen and helium elements
Mixture of compounds alcohol and water Water and alcohol compounds
Mixture of elements and compounds air Air made from water compounds, oxygen elements, carbon dioxie compounds, and nitrogen elements

Notice that the different substances in a mixture can be single atoms, molecules of elements or molecules of compounds.

Activity

Compounds and mixtures activity

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Elemental

Can you conquer the elements?

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