CHEM 1200 Edition 1nd Lecture 5 Outline of Last Lecture I Chapter Intro II Reaction Rates a 1 a A t 1 b B t 1 c C t 1 d D t III Concentration and Rate a Rate Law k x A m x B n b What factors affect speed of reaction i Reactant physical state ii Reactant concentration iii Temperature iv Catalysts c Average Rate vs Instantaneous Rate d Units of Rate Constants Outline of Current Lecture I Method of initial Rates a How to calculate Rate order i Rate 2 Rate 1 A n x B m x C p for rate 2 A n x B m x C p for rate 1 II Concentration and Time a Zeroth Order reaction b First Order reaction c Logarithm Review These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute d Confirming First Order Reactions e Second Order Reactions Current Lecture I II Method of Initial Rates a How are rate laws determined MUST be determined experimentally b Method of initial rates determines reaction orders from the effect of changing a reactant s concentration on the initial rate of the reaction c How to calculate rate order Know how to do this i Rate 2 Rate 1 A n x B m x C p for rate 2 A n x B m x C p for rate 1 Concentration and Time a Zeroth order reaction A bB products i A at time t kt A initially b First order reaction i Ln A kt ln A initially ii A A initially e kt 1 No units c Logarithm Review Must know these Will not be given on exam i Ln A B ln A ln B ii Ln A n n ln A iii Ln A x B ln A ln B iv Ln e x x d Confirming First Order Reactions using Concentration vs Time Data i Graph should exponentially decay ii Graph t and ln A linear first order reaction iii Slope of line is rate constant k 1 Rate constants are never negative e Second Order reactions i 1 A kt 1 A initially ii Plot t against ln A and 1 A 1 Whichever is linear tells you what order it is
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