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2020

Teacher Guide: Chemical and Physical Changes
STEM Case and Handbook

Grade Level: 7th-8th
Subjects: Physical Science
Versions: Middle School
Time: 30-40 mins
STEM Role: Forensic Scientist
Preview Video: Chemical and Physical Changes
Preview Video

Introduction: The secret service has recently arrested
suspects accused of creating counterfeit coins from the
year 1915 valued at $50,000 each. The students take the
role of a forensic scientist to investigate the evidence
found at the crime scene and recreate the methods used
to make the counterfeit coins. Students learn about the
chemical and physical changes in matter to prepare
evidence for the court case.

Learning objectives: STEM Cases are designed to help
students learn the core concepts and practice critical thinking skills (data analysis, data
interpretation, hypothesis and reasoning, predictions and communicating findings). Students are
assessed on each of these and their progress can be monitored in real time by teachers. The
following concepts are addressed in the Chemical and Physical Changes STEM Case:

● Physical properties of matter (color, hardness and temperature), particles that make up

matter (atoms), and molecules

● Introduction to the periodic table and elements,

chemical bonds and patterns of atoms in
molecules

● Physical

changes

(mixing,

dissolving,

condensing, melting, boiling and freezing) and
states of matter (gas, liquid and solid)

● Chemical properties (flammable, toxic and

corrosive), chemical changes through chemical
reactions (e.g., corrosion), reactants and
products

● Expanded Handbook Only: Structure of atoms (protons, neutrons and electrons),

electrical charges, and chemical energy

Vocabulary: Every STEM Case and Handbook contains a glossary containing all of the
vocabulary needed for the activity. As new vocabulary is introduced, the words are presented as
orange text- clicking the orange text opens the glossary page for that term. The glossary can
also be opened at any time throughout the case.

1. Item https://play.google.com/store/apps/details?id=boriol.grade.thirdlite&hl=en_US&gl=US

   2. https://web.kamihq.com/web/viewer.html?source=new_page&document_identifier=07643047-0f98-46d5-9267-2a30951748cb

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