Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. An increase in temperature will raise the average kinetic energy of the reactant molecules. An increase in temperature typically increases the rate of reaction. Therefore, increasing the surface area of the metal by pounding it flat or cutting it into many pieces will increase its reaction rate. For example, if a solid metal reactant and gas reactant are mixed, only the molecules present on the surface of the metal are able to collide with the gas molecules. If reactant molecules exist in different phases, as in a heterogeneous mixture, the rate of reaction will be limited by the surface area of the phases that are in contact.
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