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When apples are set out in the air, they turn brown. But when they're coated with lemon juice, the acid in the juice keeps the apples looking fresh.
In this activity, your child will design a happy face snack and experiment with using lemon juice to keep the apples fresh. In the end, your child will have learned about the effects of lemon juice on apple slices, and have a healthy snack to go along with the lesson!