Collision Theory |Questions and Answers(A+ Solution guide)

Collision theory - all reactions require activation energy, so reactions will only occur when atoms, and compounds collide with enough energy. How does increased concentration increase the rate of reaction? - More molecules are present for collisions to occur. With higher concentration, more reactants, on average, will have enough energy to proceed forward. How does surface area increase the rate of reaction? - Increases contact area for collisions. Greater contact area means more particles exposed for the reactions to take place. How does increased temperature increase the rate of reaction? - Increases molecular motion, therefore increases number and strength of collisions. How does adding a catalyst increase the rate of reaction? - Produces lower energy path (lowers activation energy.) Lowers activation energy means reactions are more likely to occur. Catalyst - Substance that increases reaction rate, but is not changed by reaction activation energy - Energy required for a reaction to occur. The spark that starts things/ gets things going. activated complex - an unstable molecule that temporarily forms