IEB rate of reactions Exam

IEB rate of reactions Exam reaction rate - Answer-the change in concentration per unit time of either a reactant or product collision theory - Answer-a model that explains that a reaction will only proceed when reactant particles collide effectively. An effective collision is one where reacting particles have sufficient energy Factors that influence reaction rate - Answer-1. Nature of reacting substance 2. Surface area of a solid 3. Concentration and pressure of the reactants 4. Temperature 5. Catalyst Nature of reactants - Answer-Reactions involving ionic substances tend to have faster rates than reactions involving covalent substances concentration - Answer-the higher the concentration of the reactants, the higher the reaction rate. Higher concentration has more particles that can collide. There are more effective collisions per time unit. Reaction surface area - Answer-the greater the exposed surface area of a solid reactant the higher the reaction rate. A higher surface area has more particles that can collide Temperature - Answer-the higher the temperature, the faster the reaction occurs. Faster particles have more effective collisions per time unit Catalyst - Answer-substance that increases the rate of a chemical reaction but remains unchanged Catalyst - Answer-a catalyst increases the reaction rate by lowering the activation energy so that more particles have sufficient energy to collide effectively activation energy - Continues...