Food colouring - looks more appetising. Flavour enhancers - brings out taste & smell. Antioxidants - preserves food for longer. Emulsifiers - blends oil & water.
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How do emulsifiers work?
The emulsifiers have molecules with one end that attracts water and one that attracts oil. This means the oil and water molecules and join together.
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Why do foods have to be cooked?
Some taste better, some are easier to digest, some are poisonous raw & cooking can kill microbes.
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How is an ester formed?
Acid + Alcohol -> Ester + Water
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What properties do perfumes need?
Easy evaporation, Non-toxic, No reaction with water, Insoluble in water & Not irritating the skin.
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How is acid rain harmful?
Lakes become acidic which kills animals & plants and the rain damages metal and stone
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What is a plastic?
A long-chain molecule called a polymer
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How can non-biodegradable plastic cause problems?
They can't break down so they don't rot. This means they're hard to get rid of as they won't decompose naturally and burning them can cause poison to be released.
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