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    • Unit 1 Labs >
      • Mass and Change Lab
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      • Design a pot lab: calorimetry
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    • Pressure/Gases Simulation (Unit 1) >
      • Pressure effects (straw) simulation
      • Pressure Effects (water bottle) simulation
      • vapor pressure (syringe) simulation
      • Evaporation rate simulation
    • Heat Simulations (Unit 2) >
      • ice melt blocks simulation
      • Heat transfer simulation
      • State of Matter Sim
      • Phase Change Simulation
    • Redox Simulations (Unit 3) >
      • redox simulation
      • Sacrificial anode simulation
    • Light Simulations (Unit 4) >
      • light simulation
    • Properties of Matter/Solutions Simulations (unit 4) >
      • Electrolyte Simulation
    • Chemical Reactions Simulations (Unit 6) >
      • Balancing Chemical Reactions
      • chemical reactions & conservation of mass simulation
      • Colligative Properties
      • Equilibrium Simulation
    • Acid Base Simulations (Unit 7) >
      • acid/base neutralization simulation
    • Electrochemical Cells/Nuclear Simulations (Unit 8) >
      • Voltaic Cell Simulation
      • electrolysis simulation
      • Nuclear fission simulation
      • Nuclear fusion simulation
How Atoms Rearrange During Chemical Reactions

How Atoms Rearrange During Chemical Reactions

Choose a reaction, then run the model. Students can see reactant particles move together, atoms rearrange, and product particles move away while the graph shows reactant concentrations decreasing and product concentrations increasing in real time.

Balanced chemical equation

Reactants
Atoms rearrange
Products

Conservation of Mass Check

Atoms are not created or destroyed. The same atoms that start in the reactants are rearranged to make the products.

Reactants
Total model mass: 0 units
=
Products
Total model mass: 0 units
Mass is conserved because the number and types of atoms are the same on both sides.

Concentration Changes

Reactants remaining
100%
Products formed
0%
Reactants Products
Start: mostly reactants End: mostly products
Student observation prompt What evidence shows that atoms are conserved even though new substances form?
Model limitation This model shows particles rearranging to emphasize conservation of atoms. It does not show exact molecular speeds, collision angles, energy changes, or reversible equilibrium behavior.
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