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Law of Conservation of Mass Practice Teacher Key
Submitted by: Natalie H.
Recommended Grade Level(s):
Appropriate for: Grade 7–8
Teaching Topics & Concepts:
Chemistry
Standards:
PS1.B.1 Develop and use a model to describe how the total number of atoms remains the same during a chemical reaction and
thus mass is conserved.
Time Requirements:
Activity Time: 30–45 minutes (one class period)
Materials:
• Periodic Table
Background Information, Activity Setup:
Students will need a periodic table and need to know how to read it. They will also need to know how to draw a basic molecule
(they do not need the correct structure, just the correct number of each atom of each molecule).
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