Catalysts work by lowering the activation energy (the minimum energy required by reacting particles for the reaction to occur). This happens because a catalyst provides an alternative reaction pathway with a lower activation energy.
NOTE: with a catalyst, although the activation energy lowers, the enthalpy change (ΔH) is not affected.
A blog covering and explaining the Edexcel IGCSE Chemistry specification for the 2016 summer exams. If you are doing just double science, you do not need to learn the stuff for paper two, if you are doing triple you will need to learn all (GOOD LUCK!) I have separated the papers to make files easier to find. Hope it helps :)
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