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CHEM 392A (8)
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Department
Chemistry
Course
CHEM 392A
Professor
Richard Ennis
Semester
Summer

Description
CHEMICAL KINETICS 61 RATE OF REACTIONChemical 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 changeconcentrationcaveragereactionraterelapsedtimet62 FACTORS AFFECTING REACTION RATE Five factors 1Chemical nature of reactants 2Concentration of reactants3Temperature4Presence of a catalyst5Surface areaCHEMICAL NATURE OF REACTANTS In homogenous chemical systems monatomic ions react extremely fast Molecular substances are much slower CONCENTRATIONConcentration increases reaction generally increasesTEMPERATURELowering temperature can decrease the rate of reaction PRESENCE OF A CATALYSTCatalyst 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 Such as amylase lactaseSURFACE AREAWhen in a heterogeneous system solid in liquid increase in reactant surface area increases the rate of a reaction Cindy Shen 1Page
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