Question

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CHM 1046 Workbook Florida International University Chapter 19-Chemical Kinetics Reaction Profile, Collision Theory, and Catalysts Textbook Reading Assignment-Sections 19.1 and 19.8 The rate of reaction is dependent on several factors, which influence the frequency of these collisions. These include changes in concentration, changes in temperature, presence of a Unit 1 catalyst, and physical state of the reactants to name a few. Learning obiectives 1) Draw reaction profiles of exothermic and endothermic reactions and label activation energles (E.) of forward and reverse reactions, transition state(s) and enthalpy of the reaction, AH,r 2) Calculate activation energy and reaction enthalpy from a given reaction profile. 3) Evaluate the role of a catalyst in changing the rate of a chemical reaction and explain its mode of action. Reaction profile Energy is needed during a reaction to break existing bonds in the reactants and create new bonds in the products. The point in the reaction where this occurs is referred to as the transition state or the activated complex. The energy needed to reach this transition state is called activation energy, E. This is the minimum amount of energy molecules need in order to react and produce products. Only those molecules that have at least this minimum amount of energy can overcome the activation energy barrier and react to produce products. The term forward reaction refers to reactants forming products. The term reverse reaction refers to products forming reactants. The term enthalpy of a reaction (AH) refers to the amount of heat produced or released during the course of the reaction. A reaction profile shows the progress of a chemical reaction as a function of potential energy (PE). An example is shown on the next page for the following reaction: A BC AB C C A In the plot shown do the products have lower energy or do the reactants have lower energy? Transition state Do you expect the AH of reaction to be positive or negative? Remind yourself that AH is always calculated Tac Reactants Products as AHon AHretets AHreactants Time 161 Potential energy

Answer 1

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