Breaking and making bonds
I can describe how bond making and breaking use or release energy.
Breaking and making bonds
I can describe how bond making and breaking use or release energy.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- In all chemical reactions, bonds in the reactants need to be broken before the reaction can happen
- Energy must be supplied to break bonds in the reactants
- Energy is released when bonds in the products are formed
- The difference between the energy needed to break bonds and the energy released is the overall energy change
Keywords
Endothermic - An endothermic chemical reaction is a type of reaction in which energy is transferred from the surroundings to the products, e.g. photosynthesis.
Exothermic - An exothermic chemical reaction is a type of reaction in which energy is transferred from the reactants to the surroundings, e.g. combustion.
Activation energy - The minimum energy that the particles must have in order to react is known as the activation energy.
Common misconception
Pupils often confuse the ideas that bonds require energy to break i.e. endothermic process and that energy is released forming bonds i.e. exothermic process.
Bonds will not break unless energy is absorbed to do so. The formation of a bond releases energy to the surroundings.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
Loading...
Starter quiz
6 Questions
