Compounds are made up of two or more elements which are chemically joined together.  

This is a molecule of glucose.  Glucose is the sugar plants make during photosynthesis.  It is made from 6 carbons, 12 hydrogen atoms and 2 oxygen atoms bonded together. 

Sodium Chloride Model

Water is a compound made of 2 hydrogen atoms chemically bonded to one oxygen atom.  

Water Molecule Mode

Table salt, which we eat every day is made of sodium and chlorine which are chemically bonded together to make sodium chloride.

Carbon Dioxide Molecule

This is a molecule of carbon dioxide, made of 1 atom of carbon bonded to 2 atoms of oxygen. 

Caffine Molecule Model

This is a molecule of caffine - the stuff we all drink coffee for.

It is made up of 8 carbon atoms, 10 hydrogen atoms, 4 nitrogen atoms and 2 oxygen atoms all bonded together.  

glucose molecule model

Compounds do not always have the same physical or chemical properties as the elements they are made of.  This is because when two elements are chemically bonded, the particles rearrange.  


Sulphur is a yellow solid at room temperature.  Iron is a silver magnetic metal which will rust. 


When you heat iron and sulphur together, a new compound called Iron Sulphide is made.  Iron sulphide is not magnetic, it is not yellow and it will not rust. 

iron sulphide

Chlorine is a toxic green gas, which will bleach anything it comes into contact with.  Sodium is a soft silver metal which reacts violently with water, burning with a yellow flame, and reacts rapidly with oxygen which is why it is stored in oil.  But if you burn sodium in a gas jar filled with chlorine you will make sodium chloride which is the same stuff you put on your chips.  

Sodium Metal
Chlorine gas
Sodium Chloride
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All images sourced from unless otherwise stated