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Introduction to Energy Changes in Chemical Reactions

Endothermic and Exothermic Reactions

This post will introduce the first topic of Module 4 Prelim Chemistry and introduce endothermic and exothermic reactions, specifically focusing on energy changes in chemical reactions.

Topic: Energy Changes in Chemical Reactions

  • Conduct practical investigations to measure temperature changes in examples of endothermic and exothermic reactions, including:
    • Combustion
    • Dissociation of ionic substances in aqueous solution


What are Endothermic and Exothermic Reactions?

Endothermic reactions are reactions that take in energy in the form of heat to occur while exothermic reactions release heat.



Dissociation is the separation of ionic compounds into their respective cations and anions in solution. This video explains dissolution, when an ionic compound is being dissolved we call it dissociation.


This video explores heat changes during dissolution.