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Topic 7 (to increase rate of reaction you must increase the frequency of…
Topic 7
to increase rate of reaction you must increase the frequency of particle collisions, with a catalyst or by increasing....
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core practical
smaller chips, larger surface area, faster rate of reaction
greater concentration, greater number of particles in a given volume, faster rate
investigations, the effect of the size of marble chips and the effect of changings in concentration
to make a chemical reaction happen the particles have to collide with lots of energy the minimum amount of energy required is called the activation energy
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Catalysts decrease the activation energy; this increases the proportion of particles with energy to react, leading to more frequent successful collisions and so an increased rate of reaction
Catalysts lower the activation energy by providing a different pathway for a chemical reaction that has a lower activation energy.
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Salts dissolving in water is either exothermic or endothermic
Neutralisation reaction is exothermic
Displacement is an exothermic or endothermic reaction
Precipitation is an exothermic reaction
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Energy taken in to break > energy released when formed = ENDOTHERMIC (because overall energy has been taken in)
Energy taken in to break < energy released when formed = EXOTHERMIC (because overall energy has been released)
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