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🔬 8th Grade · ScienceMS-PS1-5Unit 1: Matter & chemical reactions

Conservation of mass

Google Classroom

🎯 Objective: Students show atoms are conserved in reactions.

Lesson outline

  1. Closed bag reaction.
  2. Weigh.
  3. Discuss.
  4. Exit: explain.

Lesson 4 of 5 in this unit. In the Lesson Planner this lesson takes 1–3 class periods depending on your timetable: day 1 introduce & model, then practice, small-group reteach and a quick check.

📐 Standard

MS-PS1-5

Next Generation Science Standards (NGSS), middle school — Physical Science (discipline-specific model)

🏁 Unit goals

  • Model atoms and molecules
  • Analyze properties before and after reactions
  • Show mass is conserved

✅ Check for understanding

End with the exit ticket in the outline. Sort answers into got it / almost / not yet and start the next lesson with a 5-minute reteach for the “not yets”.

Practice & resources on Thinkabara

🦫 Encyclopedia: Science🦫 Kids encyclopedia⚡ Capy Live class quiz

🗓️ Plan the whole year like this

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More lessons in “Matter & chemical reactions”

  1. Atoms and molecules
  2. States of matter
  3. Chemical reactions
  4. Conservation of mass
  5. Design a heat pack

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