According to the collision Theory, particles must collide together with enough energy and the proper orientation in order for a reaction to occur. The rate of a reaction can be affected by changing factors such as temperature, particle size, concentration of reactants, or adding a catalyst. The purpose of this lab is to determine how the of reactants affects the of a reaction. Using the following reaction: Mg(s) + 2HCl(aq)> MgCl2(aq) + H2(g)​