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===Examples===
Question: Which material; cling film, foil, paper or cloth can protect chocolate from absorbing the taste of other foods?
* Experiment: Get 4 pieces of chocolate and wrap each one in each of the 4 different materials. Place them in a sealed container with crushed garlic inside. Wait for a week and then taste each chocolate.
Question: Which of these dissolves in water: Sand, Salt, Flour, Sugar?
* Experiment: Pour the same amount of water in 4 cups. Put the same amount of sand, flour, salt and sugar in each one. Stir them each for the same amount of time. If the water is cloudy or the powder sinks to the bottom then it hasn't dissolved. If the water turns clear and the powder can't be seen, then is has dissolved.