Reflection: Connection to Prior Knowledge The Energy of Phase Changes - Section 3: Explain


For this lesson I make sure to spend the time referring back to what students already learned about phase changes in Unit 2's lesson States of Matter

  • In particular I have students get out their states of matter foldable to think about what they already learned about how energy plays a role in the 3 major states of solid, liquid, and gas.
  • By doing this I help students see how they already know about energy and that this new topic is not that new and crazy. 
  • I find that many students get confused on exothermic and endothermic with phase changes.
  • Therefore I continuously tell them to think back to their foldable and which state has more or less energy so if they need to add or take away energy to make the phase change.  
  • I make sure to emphasize that they should think about how the particles are moving and how when particles go from a solid to liquid to gas they begin to move faster so gain energy which is endothermic and the opposite is true from gas to liquid to solid.  I demonstrate this with hand motions as this movie shows.

  Connection to Prior Knowledge: Building on prior knowledge
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The Energy of Phase Changes

Unit 5: Unit 6: Energy
Lesson 4 of 9

Objective: Students will be able to explain how energy plays a role in phase changes and be able to perform calculations using latent heat of fusion and vaporization through taking notes, working with partners, watching a video, performing a lab, and answering practice questions.

Big Idea: The phase of matter depends on the energy of the particles, and phase changed require either the absorption or release of energy.

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Science, Chemistry, Exothermic Reactions, phase changes, latent heat of fusion, latent heat of vaporization, heat, temperature, specific heat
  105 minutes
fusion lab students
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