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Classify phase changes

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Classify phase changes — free printable Middle School Science worksheet

This middle-school science worksheet challenges students to classify phase changes — melting, freezing, evaporation, condensation, and sublimation — within the broader topic of Matter and Particles. Teachers can use it to assess whether students can accurately sort and label each transition between states based on its defining conditions. It connects naturally to Physical Science units on matter and prepares students for more advanced thermodynamics concepts.

Learning objectives

  • Classify each phase change by its direction and the state transition it represents
  • Explain the energy gain or loss that drives each type of phase change
  • Distinguish phase changes from chemical changes using evidence-based reasoning

How to use this worksheet

  1. Select “Sign in / Sign up to download”, then sign in with Google or email to get the PDF from KiwiBee Printables.
  2. Print at home or in class for Middle School; it's no-prep, with no extra materials needed.
  3. Use the included answer key to mark it in seconds.

Good for

ClassworkHomeworkWarm-upCentersSmall groups

Answer Key

Answer key for Classify phase changes — free printable Science worksheet

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