Lab coats and safety goggles were needed for this science unit about matter and its physical and chemical properties. Students were given five unidentified mystery substances, and by learning and using the scientific process of experimentation, they were able to observe many of the properties and behaviors. With each different experiment, students saw how the substances behaved and carefully kept records of what they discovered. After many sessions, the class narrowed down the possibilities for each substance and made their hypotheses about the identities. Finally, the unknown substances were revealed. The final test of what was learned (content and process) then came when each child was given a secret mixture of at least two of the substances. On their own, each had to perform whatever experiment he or she thought appropriate to identify the ingredients.
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