Background Paragraph: Raising the temperature of a chemical reaction usually results in a higher rate of reaction. When the reactant particles are heated, they move faster and faster. This results in a greater frequency of collisions. A more important effect of the temperature increase is that the collisions occur with a greater force and are thus more likely to surmount the activation energy barrier and go on to form products. Increasing the temperature of a reaction increases the number of effective collisions between reacting particles, so the reaction rate increases. 
Story: Two colleagues read about types of chemical reactions. Sean studied about the influence of temperature on chemical reactions. Gabe studied about other influencing factors.
Which student read less about a greater frequency of collisions? Which student read less about higher rates of reaction? Which student read less about increasing reaction rates? Which student read less about reactant particles being heated? Which student read less about the activation energy barrier? Which student read more about a greater frequency of collisions? Which student read more about higher rates of reaction? Which student read more about increasing reaction rates? Which student read more about reactant particles being heated? Which student read more about the activation energy barrier?