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Lecture Notes on Iodine-Clock

Lecture Notes on Iodine-Clock - CHM2021 Chemical Principles...

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CHM2021: Chemical Principles 3 Laboratory CJT 01/10 Kinetics of an Iodine-Clock Reaction Lecture Notes Page 1 of 5 Objectives Provide a definition (with units) for reaction rate Explain how concentration, temperature, and surface area influence reaction rate Explain the significance of the components in a reaction rate law Given initial rate data, provide the rate law for a chemical reaction Determine the numerical value of the specific-rate constant, k, when given experimental rate data Determine from experimental data the rate law of a chemical reaction Explain the role of each chemical in the system studied in the "Iodine-Clock Reaction" Important Definitions Kinetics: the division of chemistry which evaluates the rates and mechanistic pathways whereby reactions proceed. Reaction Rate: a numerical measurement of chemical-concentration change as a function of time (Typical Units: M s -1 , M min -1 , M h -1 ) Rate Law: a mathematical statement illustrating the relationship between reaction rate and the molar concentrations of reactants. Order: the exponent to which a reactant is raised; the order illustrates how changes in concentration affect the rate of a chemical reaction. Orders can be positive or negative, as well as whole numbers and fractions. Specific-Rate Constant (k): the proportionality constant in the reaction rate law; the specific- rate constant correlates the numerical relationship between reaction rate and the reactant concentrations. Note: units of the specific rate constant vary between reactions, depending on the order with respect to each reactant.
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