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3. CHEMICAL CHANGES

Happen when the original matter transforms into other new substances.

The original matter cannot be recovered.

MATTER AND ENERGY

3.1 ​​​​​​TYPES

OXIDATION

Happens when some metal substances combine with oxygen in the presence of water, producing rust. (iron)

COMBUSTION

Happens when objects or substances are burned. Also needs oxygen and produces gases, light and head.

FERMENTATION

Happens in some living thing. Some are used to produce wine. bread or yoghurt. (yeast and bacteria)