Chemical reactions take place when particles collide.
The rate of the reaction depends on the number of successful collisions between the reacting particles, the higher the number of successful collisions that take place, the faster the reaction.
The rate of reaction can be increase by increasing the concentraion, raising the temperature, or the pressure.
-As the concentration increases, there are more reacting particles in a smaller space, this increasing the number of successful collisions between reacting particles, increasing the rate of reaction also.
-As the temperature increases, the particles gain kinetic energy and therefore move around more quickly, this means the number of successful collisions increases as the particles collide more due to lots of movement.
-Increases in pressure forces the particles together, meaning more successful collisions will take place and therefore increasing the rate of reaction.
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