4B The Earth #3 When liquid water disappears, it turns into a gas (vapor) in the air and can reappear as a liquid when cooled, or as a solid if cooled below the freezing point of water.... 4D The Structure of Matter #1 Heating and cooling cause changes in the properties of materials....

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Heat

http://teams.lacoe.edu/documentation/classrooms/gary/heat/activities/mystery/Mystery.html


Description

This is an activity that deals with the behavior of substances when heated and cooled. A review of the topic of expansion and contraction provides students with instruction that most materials expand when heat is added and contract when heat is removed. The rest of the activity is an online mystery in which students attempt to identify the everyday substance that is the exception to the rule of expansion and contraction. Clues and hands-on activities are provided to help students solve this mystery.

This can be assigned as an independent activity that can be done by students in pairs or small groups. Since this tool requires students to do some hands-on activities, it is suggested that teachers preview the entire activity and take note of required materials. Make sure that middle-school students view the explanation of why the mystery substance (water) behaves as it does. This explanation will help students to understand what is happening on a molecular level. For younger students, you may want to skip this explanation.

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Created : 08/26/2002