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How does concentration affect the rate of reaction?

How does concentration and catalysts affect the rate of reaction?

  • i gotta do chemistry coursework... can someone please tell me: a) how does changing the concentration alter the rate of reaction? b) how does inserting a catalyst alter the rate of ...show more

  • Answer:

    Simply like this: (a) More concentrated -> more particles -> more successful collisions -> increased reaction rate. (b) a catalyst provides a reactants with an alternative reaction pathway with a lower activation energy, so more particles can collide successfully. Hence, a faster reaction.

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I would like to point out that in some cases too much catalyst can actually inhibit the reaction, For example if you dope sodium aluminium hydrate with titanium butoxide only 1% dope is needed for the reaction to be catalysed. Addition of 5% dope slows the reaction rate over 100 fold

Simon G

increasing concentration increases rate of the reaction as there are more particles so there is a larger chance of collision. adding a catalyst increases rate by providing a surface to react on or by offering an alternate route of lower activation meaning more particles have the energy to react so more collisions are successful

John

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