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." Kit 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.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 553
Flinn Middle School Catalog/Reference Manual Page 375
You May Also Like
- Flinn Scientific Electronic Balance, 410 x 0.01-g
- Cylinder, Borosilicate Glass, 1000 mL
- Buoyancy in Air - Mass vs. Weight Demonstration Kit
- Seeing the Invisible - Chemical Demonstration Kit
- Mass Is Conserved - Volume Is Not! Chemical Demonstration Kit
- Determination of Molar Mass of Gases and Volatile Liquids - AP Chemistry Classic Laboratory Kit
- Cartesian Diver Construction - Super Value Kit
- Build Your Own Hydrometer - Student Laboratory Kit
- Massing Gases - Chemical Demonstration Kit
- The Gas Laws, Flinn ChemTopic Labs Book, Volume 9