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In this chemistry activity, learners perform three chemical reactions in a sealed zip-top bag. Learners will record their observations and classify the changes as chemical or physical.

In this activity (page 3 of the PDF), learners will observe a physical change.

In this activity about combustion and energy, learners observe a burning candle in a sealed jar and the burning of white sugar.

This activity was designed for blind learners, but all types of learners can participate to learn about conservation of gas. This is one of the classic experiments using baking soda and vinegar.