Temperature: It increases the speed of the collisions, so that they collide more frequently and with greater energy, therefore more sucessful collisions and a faster rate of reaction. *(More collisions at or above Ea per second- for every 10'c rise in temperature, there is a doubling in rate)*

Concentration: Increases the number of reactant particles per cm3; Therefore the number of collisions per second increases, increasing the rate of reaction *(2 x pressure means 2 x more collisions per second which means 2 x rate of reaction) *

Surface area : Increases the possiblility for collisions on the surface of the solid, so increases the rate of reaction *(2 x surface area means 2 x more collisions per second which means 2 x rate)*

Catylysts: Change the rate of reaction but are not used up in the reaction: they are specific for a particular reaction *(i.e the shorter the time, the faster the rate, and the steeper the line (gradient), the faster the rate)*

Pressure: Increases the frequency of collisions and so increases the rate of reaction *(2 x pressure means 2 x more collisions per second which means 2 x rate of reaction) *

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