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Investigation into what affects the rates of a reaction Background Information Reactions occur when particles of different elements or compounds collide, and react together. The particles need a certain amount of energy for the collisions to be effective. Particles can gain energy by collisions. Only collisions with enough energy are effective enough to cause a reaction. The minimum amount of energy needed for a reaction to happen when the particles collide is called the activation energy. This diagram shows the activation energy of a reaction. As you can see, the reactants have a certain amount of energy, through collisions they increase the amount of energy. At the activation energy the reactants start to react, this makes them lose energy as they turn into the products which have even less energy. For a reaction to happen the particles must overcome this energy barrier. Several factors can change the amount of energy each particle has, or...

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