Reflection: Grappling with Complexity Types of Matter - Section 4: Mini-lesson and Guided Practice


Honing in on what a substance is made of is a complex task. The answers are not always apparent from the visual clues. Glue is a good example of this. According to the dichotomous key, it would be logical for a student to assume that glue is a compound. However, glue is made up of several compounds and is in fact a mixture. If some students can come to this realization on their own, then this will be a successful lesson. I really encourage students to read about the substance on the label or on the Internet, rather than explain to them what I know about the substance. It is in the path of discovery that learning will take place. When students discover that glue is made up of several compounds mixed evenly together, they will own that understanding so much more than if I tell them.

  I don't know what a substance is made of
  Grappling with Complexity: I don't know what a substance is made of
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Types of Matter

Unit 1: Chemical and Physical Properties
Lesson 3 of 11

Objective: Students will be able to differentiate between homogeneous and heterogeneous mixtures, elements, and compounds.

Big Idea: Most matter can be classified as mixtures, compounds, or elements.

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  55 minutes
herbal tea
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