In the Buoyancy in Air - Mass vs. Weight Demonstration Kit for physical science and physics, discover what is really measured when we "weigh" something on a balance.
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In a chemical reaction, matter is neither created nor destroyed-except in this discrepant event demonstration! Let students discover what is really measured when something is “weighed” on a balance. First carry out a gas producing reaction in a capped bottle to verify the law of conservation of mass in a chemical reaction. When a balloon is substituted for the cap, the balloon captures the product gases and is supported by buoyant forces in air. The mass decreases as the balloon fills up! The apparent mass discrepancy should help students understand the difference between “weighing” and “massing.” Enough materials are provided to perform the demonstration seven times.
Concepts: Conservation of mass, buoyancy, mass versus weight.
Time Required: 15 minutes
Materials Provided: Acetic acid, sodium carbonate, balloon, 1-L bottle and cap, weighing dishes.
Correlation to Next Generation Science Standards (NGSS)
Science & Engineering Practices
Using mathematics and computational thinking
Analyzing and interpreting data
Disciplinary Core Ideas
MS-PS1.B: Chemical Reactions
MS-PS2.A: Forces and Motion
HS-PS1.B: Chemical Reactions
Energy and matter
Stability and change
MS-PS2-3: Ask questions about data to determine the factors that affect the strength of electric and magnetic forces
MS-PS2-5: Conduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though the objects are not in contact
HS-PS2-5: Plan and conduct an investigation to provide evidence that an electric current can produce a magnetic field and that a changing magnetic field can produce an electric current.
HS-PS3-3: Design, build, and refine a device that works within given constraints to convert one form of energy into another form of energy.
HS-PS3-5: Develop and use a model of two objects interacting through electric or magnetic fields to illustrate the forces between objects and the changes in energy of the objects due to the interaction.