Chemical reactions

1. Oxygen
2. water

1. Fuel
2. Oxygen
3. Thermal energy

1. Fungi
2. Bacteria
3. Mould

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• Atoms ar not created or destroyed, Their bond break and the atoms are rearranged inside the new product. New bond are formed

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• The colour of the new substance changes

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• A gas is produced as a new product, it may smell.

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• 2 liquids react to form a solid

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• Energy in the form of light is produced

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• Heat is released

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• Heat is absorbed