Reflection: Debate Types of Matter - Section 7: Debrief


While scientists are not alone in their reliance on the use of evidence, such use is certainly a strong component of the scientific endeavor. In this lesson my students get to grapple with using evidence to justify their answers. The example of sand is one instance where there can be more than one right answer, and this duality forces students to dig deeper to justify their response.

Where this will become very apparent is when students start offering their own examples of the different mixtures. In some cases students are simply unaware of how a substance is comprised. Gentle questioning is a good way to tease out the complexity of how substances are made.

It is important for me to not come across as a know-it-all during this part of the lesson. I explain that there are millions of substances in the world, and no person is an expert on them. Scientists use tools to analyze the materials, and by understanding how they are made they can better understand how to interact with them. The important thing to emphasize, therefore, is that the use of evidence is quite important, not knowing the exact composition of the myriad objects that comprise our world.

  Fact or Fiction
  Debate: Fact or Fiction
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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
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