What better way is there to introduce conservation of mass than a few simple experiments? Young chemists conduct two chemical reactions, take the masses of reactants and products, then compare their results to determine differences in mass.

Concepts

conservation of mass, chemical reactions, balancing equations, making observations, making inferences, mass

Show More Show Less

Additional Tags

science

Show More Show Less

Instructional Ideas

• Have partners perform the experiment as an inquiry, then use their data as evidence for an explanation of conservation of mass
• Lead the class in writing and balancing the chemical equations for the reactions to show the connection between molar coefficients and conservation of mass
  

Classroom Considerations

• Make sure pupils zero out their balances before taking mass measurements for optimum accuracy
• The activity calls for three-well spot plates, which can be made by cutting down standard well plates
  

Pros

• Microscale labs save time and materials
• The teacher's guide contains references materials and student copies of the experiment and worksheet
  

Cons

• None

Common Core

RST.6-8.3 RST.9-10.3 RST.11-12.3