Summary
Uses a mystery-material guessing game format to practice identifying materials purely from their observable properties — reinforcing that properties are the tools scientists use to describe and identify matter.
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Teaching resources
Discussion questions
Discussion
- If you could not see an object but could touch it, what properties could you still identify?
- Why is 'it's blue' less useful than 'it reflects light at a wavelength of about 470 nanometers'?
- How do scientists identify a completely unknown substance in the field?
- Can two different materials have identical observable properties? What do scientists do then?
Quick work-a-long
Vocabulary: observe, property, identify, describe, texture, hardness, opacity.
Try it: Put three different objects in paper bags. Partners take turns reaching in (without looking), describing only what they feel, while the other partner writes down what they think it is. How accurate were you?