Fuels such as petrol, diesel and natural gas are hydrocarbons.
Hydrocarbons are chemicals made from carbon and hydrogen only.
When a fuel burns the oxygen atoms from the air combine with:
- Carbon atoms to form carbon dioxide.
- Hydrogen atoms to produce water.
In a chemical change/reaction atoms seperate and recombine to form different chemicals.
Chemical changes can be shown by pictures of the atoms and molecules involved.
During a chemical change, the number of atoms of each kind is the same in the products as in the reactants.
The consevation of atoms means that combustions reactions affect air quality.
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