Different substances can have different densities, but can the same substance have different densities? Lesson explores the effect of temperature on the density of water. Extension idea connects the concept of how melting ice in lakes spreads nutrients from the bottom of the lake throughout the water. 

Concepts

temperature, density, molecules, heat, cooling, volume, water density

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Additional Tags

science

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Instructional Ideas

• Have pupils predict whether it matters if they put hot water on top of cold or cold water on top of hot and why

Classroom Considerations

• Requires clear baby food jars for the demonstration
• Follow all safety guidelines when handling hot water
• Lesson is the last in a six-part series

Pros

• Lesson follows a 5E format
• Provides answers to all student work as well as discussion questions
• Utilizes all common materials needed for the demonstration and hands-on activity

Cons

• None

Common Core

RST.6-8.3 RST.6-8.4 RST.6-8.7 WHST.6-8.1.a WHST.6-8.1.b WHST.6-8.1.c WHST.6-8.1.d WHST.6-8.1.e