Elements, compounds and mixtures

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Presentation transcript:

Elements, compounds and mixtures Elements – these are substances containing only one type of atom. For example, sodium is an element and is made up of sodium atoms only. AQA Science © Nelson Thornes Ltd 2006 1

Compounds – these are substances made up of two or more types of atom Compounds – these are substances made up of two or more types of atom. These atoms are joined together chemically. For example, carbon dioxide contains carbon and oxygen atoms joined together by chemical bonds.

Mixtures – these are not pure substances Mixtures – these are not pure substances. The compounds and/or elements making them up are not joined chemically. For example, air is a mixture of gases like oxygen (an element) and carbon dioxide (a compound). AQA Science © Nelson Thornes Ltd 2006 3

Elements, compounds and mixtures Classify the following substances as elements, mixtures or compounds. mixture compound element AQA Science © Nelson Thornes Ltd 2006 4