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Summary GCSE Chemisty Edexcel - Paper 2 - Topic 7 - Rates of reaction
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A substance that speeds up a reaction without beingchemically changed or used up, and without changing the
reaction products
Don't appear in chemical equations, instead they are written
above the arrow
Catalysts
Decrease the activation energy by providing an alternative
reaction pathway
Biological catalyst
Catalyse chemical reactions inside living organisms
Enzymes
Generally only catalyse a specific molecule
Measuring the rate of reaction = Quantity of reactant or
product made/ Time Calculating rates of reaction
Measured in units like: cm3 / seconds
Measures: product produced in a given time
When comparing graphs you can see which is the
faster one because it plateus earlier
Reactions that start at the same amount of reactants, will Rate of reaction graphs
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