Activity Number 305

	Overview and Learning Objectives
	Classroom Practice
	Central Concepts
	Benchmarks and Standards
	Extensions and Connections
	Activity Credits
	Requirements

Phase Change (SAM)

Interactive, scaffolded model

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	Overview and Learning Objectives Students review the atomic arrangements for each state of matter, following trajectories of individual atoms to observe their motion and observing and manipulating differences in attractions among the atoms in each state. Then students experiment with adding energy to effect a change in state. They finish by exploring the more complex phenomena of latent heat and evaporative cooling. Students will be able to: • Give example of phase changes that occur every day and how they affect the world around us. • Describe what the phases of matter (solid, liquid, and gas) look like at the atomic level. • Explain how the forces of attraction are what keep atoms in a particular phase at a specific temperature. • Explain how the input of energy into a system affects the state of matter. • Describe how both latent heat and evaporative cooling play a role in changes of phase. return to top



	Classroom Practice Teacher's Guide http://sam.concord.org/publications/teacher-guides/phase_changes.ver6.pdf return to top



	Central Concepts Key Concept: Additional Related Concepts Physics/Chemistry Latent heat States of Matter return to top



	Benchmarks and Standards NSES Physical-Science: Atomic Structure - 1 Matter is made of minute particles (Full Text of Standard) Physical-Science: Matter Structure/Properties - 5 Solids, liquids, and gases differ in the distances and angles between molecules (Full Text of Standard) return to top



	Extensions and Connections Fermi Lab's ARISE Project suggests the following enhancement to this SAM unit: http://www.concord.org/~barbara/SAM/ARISE/ARISE_SAM_phase_change.pdf return to top



	Activity Credits Created by CC Project: SAM using Molecular Workbench return to top



	Requirements Java 1.5+ - Java 1.5+ is available for Windows, Linux, and Mac OS X 10.4 and greater. If you are using Mac OS X 10.3, you can download MW Version 1.3 and explore within it instead. return to top

These materials are based upon work supported
by the National Science Foundation under grant numbers
9980620, ESI-0242701 and EIA-0219345

Any opinions, findings, and conclusions or recommendations expressed in this
material are those of the author(s) and do not necessarily reflect
the views of the National Science Foundation.

Phase Change (SAM)

Overview and Learning Objectives

Classroom Practice

Central Concepts

Additional Related Concepts

Benchmarks and Standards

Extensions and Connections

Activity Credits

Requirements