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Order of reaction - Concentration Problem The problem is to determine the rate equation for the reaction of hydrochloric acid with magnesium metal, and find the activation energy for the reaction: 2HCl(aq) + Mg(s) --> MgCl2(aq) + H2(g) Background Information Rate of reaction is the change in concentration of a reactant or product with respect to time as the reaction progresses. Particles react when they come into contact with each other with sufficient kinetic energy. This amount of energy is called the activation energy of the reaction. For my experiment I define rate as the change in concentration of hydrochloric acid per second. The rate of a reaction is affected by four factors.1 1. Concentration is the number of particles of a substance per unit volume. The higher the concentration, the greater the chance of a collision between reactants. 2. For a heterogeneous reaction, where reactants are in different physical states, the reaction takes place on the...

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