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Biology journal Cambridge IGCSE 0610

Food tests · 3 parts · syllabus 4.1

What is in this food?

Find out which elements and building blocks make up carbohydrates, proteins and fats, then test orange juice and five mystery solutions with iodine, Benedict's, biuret, the emulsion test and DCPIP.

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A packed lunch on a table: a bread roll, a whole egg and a halved boiled egg, a wedge of cheese, an orange with peel, and a small bottle of cooking oil, beside a lunch tin and a folded cloth. (enlarge)

Follow the idea

  1. What food is made of

    What food is made of: carbon, hydrogen, oxygen and nitrogen; big molecules from small ones

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  2. Testing foods

    Testing foods: iodine, Benedict's, biuret, the emulsion test and DCPIP, each beside a water control

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  3. The structure of DNA

    The structure of DNA: a double helix of two strands, with A paired to T and C to G (Supplement)

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A rack of six test tubes: blue-black, brick-red with a red-brown precipitate at the bottom, purple, evenly cloudy white, colourless, and a blue one; an amber dropper bottle and a dropping pipette lie in front.

The experiment · Orange juice and five mystery solutions · five food tests, each beside a water control

Run it yourself, or project it for the class

Use the apparatus step by step and look closely at what happens. The whole experiment fits one screen, so it works on a projector too.

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