AICE Chemistry | Chapter 6.1: What are Enthalpy Changes?

This lecture covers Section 6.1: What are Enthalpy Changes?, from Chapter 6: Enthalpy Changes. We'll introduce the fundamental concepts of chemical energetics, distinguishing between reactions that release heat and those that absorb it.

In this video, we will cover:

The definition of exothermic reactions (transferring heat to the surroundings) and endothermic reactions (absorbing heat from the surroundings).

Understanding Enthalpy and Enthalpy Change.

Why exothermic reactions have a negative enthalpy change and endothermic reactions have a positive enthalpy change.

How to draw and interpret reaction pathway diagrams (enthalpy profile diagrams) to visualize the energy of reactants versus products.

The definition of Activation Energy as the minimum energy required for a reaction to occur, and how to represent it on energy diagrams.

This video is designed to align with the Cambridge AICE Chemistry (9701) curriculum and is based on the official course textbook and lecture materials. Whether you're calculating energy changes or drawing energy profiles, this lesson is the starting point for thermodynamics.

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