Chemical and Physical Changes

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Chemical and Physical Changes STEM Case

The Secret Service recently arrested suspects accused of counterfeiting coins from 1915 valued at $50,000 each. The students act as a forensic scientist to investigate the crime scene and the evidence. Students learn about chemical and physical changes to recreate the methods used to make the coins as evidence for the trial.

STEM Cases are interactive explorations in which students practice problem-solving and critical thinking as they solve a real world problem as a STEM professional.
  • View students results in realtime.
  • Cases take 30-90 minutes to complete.
  • Student progress is automatically saved.
  • Complete in multiple sessions.


More About STEM Cases

Student progress is automatically saved so that STEM Cases can be completed over multiple sessions.

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LevelDescriptionEstimated Time
Middle School  This version is for middle school classes. 30-40 min

Expanded Handbook

More About Handbooks

Most content from the Expanded Handbook is included in the corresponding STEM Case.

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LevelDescriptionEstimated Time
Middle School  The Expanded Handbook covers structure of atoms (protons, neutrons and electrons), electrical charges, and chemical energy, in addition to the concepts covered in the handbook section of the Middle School Case. 20-25 min


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