During this activity students explore in depth their own understanding ofwhat constitutes "matter" and work together as a group to create adefinition for matter. Students work in pairs to debate how to sort "items" printed on cards into three categories: "matter", "non-matter" and "unsure" and then try to determine what properties all items in each category have in common. A whole class discussion about "tricky" items follows during which students ultimately agree on a definition of matter.

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