Thermochemistry

Study the flow of heat during chemical reactions and physical changes, and how energy determines reaction behavior.

States of Matter

Understand the properties of solids, liquids, and gases — and how particle arrangement defines each state.

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The Gas Phase

Explore how gases behave under changing pressure, temperature, and volume using gas laws.

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Phase Changes

Learn how matter transitions between states and how energy is involved in melting, boiling, and condensing.

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Reaction and Formation Enthalpies

Study how the enthalpy change of a reaction relates to bond breaking and formation.

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Bond Enthalpy

Learn how much energy is needed to break chemical bonds and how this affects reaction energetics.

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Thermochemistry of Common Processes

Explore heat changes in everyday processes like combustion, neutralization, and dissolution.

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Gibbs Free Energy

Learn how to predict whether a reaction will occur spontaneously using energy and entropy changes.

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Ready to take IJSO-style thermochemistry practice questions?

Apply your knowledge with our collection of IJSO-style thermochemistry problems.

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Ready to take IJSO-style thermochemistry and chemical kinetics mock tests?

Challenge yourself with our collection of IJSO-style mock tests in thermochemistry and chemical kinetics, designed to test your problem-solving skills and understanding.

View Thermochemistry and Chemical Kinetics Mock Tests