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Understand Endothermic and Exothermic Reactions

In this worksheet, students will learn about the energy involved in chemical reactions and how it is used or released by the reaction itself, in endothermic or exothermic reactions, respectively.

'Understand Endothermic and Exothermic Reactions' worksheet

Key stage:  KS 3

Year:  Year 9 Science worksheets

Curriculum topic:   Chemistry: Energetics

Curriculum subtopic:   Exothermic and Endothermic Reactions

Popular topics:   Chemistry worksheets

Difficulty level:  

Worksheet Overview

Chemical reactions involve energy change.


During a chemical reaction, energy is transferred to or from the surroundings and the temperature changes.


For example, when we turn on the gas on our kitchen hob, a chemical reaction, called combustion or simply burning, takes place. Combustion transfers heat to its surroundings, so our food on top of it takes in the heat and cooks. The temperature in our cooking pot rises.


Gas cooker


Reactions that transfer energy to their surroundings, like combustion, are exothermic reactions.  Neutralisation is another type of exothermic reaction - this is the reaction between acids and alkalis.


The opposite happens in endothermic reactions.  The energy in these reactions is taken from the surroundings.


Electrolysis and thermal decomposition are two types of endothermic reactions.


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