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Understanding the Law of Conservation of Mass Through Chemical Reactions

This lesson focuses on the Law of Conservation of Mass, which states that mass cannot be created or destroyed in a chemical reaction. Students will review two different chemical reactions and write the formulas for the elemental clumps present on both sides of the reactions. Through interactive activities, including identifying balanced equations and reflecting on the importance of balancing reactions, students will deepen their understanding of how mass is conserved during reactions, illustrating a fundamental principle in chemistry.

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Understanding the Law of Conservation of Mass Through Chemical Reactions

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  1. Please Do Now (5 min) 38 Null Review: In your own words, what is the Law of Conservation of Mass? What does it mean? New stuff: The pictures below show two different chemical reactions. For each one, write formulas for the element clumps on both sides of the arrow. Reaction #1 Reaction #2 before after after before

  2. Reaction #1

  3. Reaction #2

  4. Closing (5 min – SILENT) • 1. Clicker: Which of the following equations is balanced? • H2O H2 + O2 • Mg + 2Cl  MgCl2 • O2 + C  2CO • MgO  Mg + O2 • 2. Writing: How does balancing equations show you the Law of Conservation of Matter?

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