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The collision theory describes how the rate of reaction increase (the time taken for the magnesium ribbon to disappear when it is reacted with hydrochloric acid) when the concentration of HCL increases. The theory states that if, the more concentrated the reactants, the greater the number of collisions between particles increase. This also explains why the greatest rate of reaction is usually as soon as the reactants have been mixed,i.e they are both at thier highest concentrations. As the reaction continues,the concentration of the reacting substances decrease and so does the rate of reaction. We must consider what happens when a reaction takes place. First of all the particles of the reacting substances must collide with each other, and secondly a fixed amount of energy called activation energy(Ea) must be reached if the reaction is to take place. If the particles can produce the right amount of energy(i.e if they collide fast enough and in the right direction) a reaction will...

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