- Oxidation: one substance changes into another when it reacts with oxygen. For example, iron changes into rust.
- Combustion: when an object or substance is burned, it changes into another subtance. For example, when wood burns, it changes into ashes and gases.
- Putrefaction: this occurs when a living thing decomposes. For example, when an apple decays, its appearance, colour, smell and taste change.
Chemical industries use chemical reactions to manufacture substances. Some substances, such as plastic, are artificial. Plastic is made from petroleum.
- Combustion: when an object or substance is burned, it changes into another subtance. For example, when wood burns, it changes into ashes and gases.
- Putrefaction: this occurs when a living thing decomposes. For example, when an apple decays, its appearance, colour, smell and taste change.
Chemical industries use chemical reactions to manufacture substances. Some substances, such as plastic, are artificial. Plastic is made from petroleum.
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