Chemistry 1301A/B Chapter : chapter six notes.docx

• School: Western University
• Department: Chemistry
• Course: Chemistry 1301A/B
• Professor: Kay Calvin

Document Summary

Chemical kinetics: the area of chemistry that deals with rates of reactions. Rate of reaction: the speed at which a chemical change occurs, generally expressed as change in concentration per unit time averagereactionrate=change concentration elapsedtime r= c. Five factors: chemical nature of reactants, concentration of reactants, temperature, presence of a catalyst, surface area. In homogenous chemical systems, monatomic ions react extremely fast. Lowering temperature can decrease the rate of reaction. Catalyst: a substance that alters the rate of a chemical reaction without itself being permanently changed. Enzymes: a molecular substance (protein) in living cells that controls the rate of a specific biochemical reaction. When in a heterogeneous system (solid in liquid ) increase in reactant surface area increases the rate of a reaction. The rate law: the rate, r, will always be proportional to the product of the initial concentrations of the reactants, where these concentrations are raised to some exponential values.