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Product 12802

By: The Flinn Staff

With the Conservation of Mass and Buoyancy Chemistry and Physics Laboratory Kit, students understand what is measured when we “weigh” something. Matter is neither created nor destroyed, except in this apparent contradictory experiment!

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In a chemical reaction, matter is neither created nor destroyed, except in this apparent contradictory experiment! Students will understand what is really measured when we “weigh” something on a balance. Students first conduct an experiment to verify the law of conservation of mass in a chemical reaction. They then perform a second experiment in which the product gases are supported by buoyant forces in air. Air acts as a fluid and so the final mixture weighs less than the original. Because a balance actually weighs objects and converts this to mass readings, the apparent mass discrepancy really helps students understand the difference between “weighing” and “massing.” Includes chemicals and equipment for 15 complete experimental setups along with reproducible student handouts, detailed background information and complete Teacher Notes with sample data and answers to all questions.

Complete for 30 students working in pairs. Requires a balance with sensitivity of at least 0.01-g.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking

Disciplinary Core Ideas

MS-PS1.B: Chemical Reactions
MS-PS2.A: Forces and Motion
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Energy and matter
Stability and change