This is a fast-paced lesson that looks at how particle size affects the rate of reaction and challenges the students to carry out a practical to obtain valid results to back up the theory. It is a fully-resourced lesson that consists of an engaging lesson presentation (19 slides) and a calculation worksheet which is differentiated two ways to enable those students who find the maths hard to have a way to access the learning. Students are guided through a method of calculating the surface area and volume of the object and calculating the surface area to volume ratio. Using the answers to their calculations, they will complete a summary passage which explains why having more exposed reacting particles leads to an increased rate of reaction. Students will then carry out a practical where they have to determine which cube of jelly to use to make jelly the fastest in order to test their summary passage is valid.
This lesson has been designed for GCSE students but could be used with younger students looking at chemical reactions and investigating the factors that affect the rate.
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