Make sure to consult the teacher's handbook, Inquiry in Action - Investigating Matter Through Inquiry, for two demonstrations that can be done to introduce solubility and measuring crystal mass before having the class conduct this investigation. Physical scientists mass equal amounts of the five crystals that they have already been working with. Then they dissolve each in water as a step closer to identifying the unknown crystal in the group. Ideally, you would immediately follow this with the final activity in the mini unit.

Concepts

crystals, solubility

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Additional Tags

solubility, crystals, science

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Pros

• Part of an exciting exploration of the properties of crystals and identifying unknowns
• High-quality resources include teacher support and student handout

Cons

• None