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Popular pages
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Physics Simulations | CK-12 Foundation
Discover a new way of learning Physics using Real World Simulations
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Chemistry Simulations | CK-12 Foundation
Discover a new way of learning Chemistry using Real World Simulations
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Balancing Chemical Equations (Balancing Chemical Equations) | Chemistry Simulations | CK-12
Learn the basic of chemical equations by watching methane bubbles light on fire. Practice balancing chemical equations.
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Atom Builder Challenge (Atomic Number, Mass Number, Proton, Electron, Neutron, Modern Periodic Table
Learn what makes each element unique by building the mystery atoms in the periodic table.
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States of Matter (Matter and its States) | Chemistry Simulations | CK-12
Compare three states of matter: solid, liquid, and gas.
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Subatomic Particle Zoo (Quarks) | Physics | CK-12 Exploration Series
Learn about the most basic particles of matter, including quarks and leptons, and the four fundamental interactions using our interactive simulation.