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Learners are given mysterious white powders and have to determine their identity with chemical tests.

In this biology activity (page 8 of the PDF), learners will explore how saliva assists in the beginning of the digestive process.

Learners write an invisible message using lemon juice on a piece of paper. They then develop the message by soaking the paper in a dilute iodine solution.

In this activity on page 7 of the PDF (Chemistry—It’s Elemental), learners use iodine to identify foods that contain starch.