Maintaining Mass

This Maintaining Mass lesson plan also includes:

Can you disprove the law of conservation of mass? Pupils observe the teacher weigh each part of a reaction. Then, the teacher weighs the result of the reaction and everyone sees that the products do not equal the reactants. Then they must decide if the teacher made a mistake or if the scientific law is wrong and prove their positions.

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CCSS: Adaptable
NGSS: Designed
Additional Tags
Instructional Ideas
  • After the lesson, discuss where the mass for plant growth comes from
Classroom Considerations
  • Relies on prior knowledge of matter, the periodic table, and identifying the difference between physical and chemical changes
  • Have extra balloons available as students may tear use them incorrectly before they discover the answer
  • Includes answer keys
  • Uses materials that are easy to find
  • Requires higher level thinking and problems solving skills
  • None