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The Mass Is Conserved Volume Is Not! Chemical Bonding Demonstration Kit shows that adding two identical volumes doesn’t always give twice the volume. Students learn that the concept relates to mass but not to volume or moles.

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50 + 50 doesn’t always equal 100! Many students have heard that matter is not created or destroyed. This concept relates to mass but not to volume or moles. Show students that adding two identical volumes does not always give twice the volume when combined. Three different demonstrations are performed to show that in the combination of reactants different intermolecular bonding and densities may result—leaving the final volume a discrepant event. Demonstration kit comes complete with instructions, teaching information, sample data, a reproducible student handout and answers for the teacher.

Concepts: Conservation of mass, intermolecular forces–hydrogen bonding, neutralization, density.
Time Required: 15–20 minutes

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking
Constructing explanations and designing solutions
Engaging in argument from evidence

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
MS-PS2.B: Types of Interactions
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Cause and effect
Scale, proportion, and quantity
Systems and system models

Performance Expectations

MS-PS1-1. Develop models to describe the atomic composition of simple molecules and extended structures.
MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
MS-PS2-3. Ask questions about data to determine the factors that affect the strength of electric and magnetic forces
HS-PS1-3. Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.
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.
HS-PS1-7. Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.