CHEM 1220 Chapter Notes - Chapter 14: Reaction Rate, Rate Equation, Reaction Rate Constant

• School: Ohio State University
• Department: Chemistry
• Course: CHEM 1220
• Professor: Allen Heather

Document Summary

Chemical kinetics: the area of chemistry concerned with speeds or rates. Reaction rate: the speed at which a chemical reaction occurs. 14-1| factors that affect reaction rates: physical state of reactants. Homogeneous (involving one state of matter) or heterogeneous (involving more than one state of matter). As surface area increases in solids, reaction rates increase: reactant concentrations. As concentration increases, reaction rate increases: reaction temperature. As temperature increases, reaction rate increases: presence of catalyst (agents that increase reaction rates without being used up, the greater the frequency of collisions, the greater the reaction rate. Speed is defined as change that occurs within given time interval, molarity/second (m/s) Average rate of appearance of b= (change in concentration of b/change in time) Average rate of disappearance of a= -(change in concentration of a/change in time) Rates decrease as reaction proceeds because concentration of reactants decreases. Instantaneous rate: the rate at a particular instant during the reaction.