Virtual Chemistry Experiments

Chemical Kinetics

Topic Concepts Experiment
Reaction Rates The stopped-flow technique and its use in studying chemical reactions is described. The speed or rate of a reaction is discussed. Concentration vs time plots are recorded for reactants and product in a chemical reaction. Characteristic features for rates of change in the concentrations of reactants and product are explored.
Rate of Reaction The relationships between the relative rates of change in concentration of reactants and products is discussed. The general expression for the rate of reaction is presented. The stoichiometric coefficients for a chemical equation are determined by comparing the slopes of concentration-time plots for the reactants and products.
Differential Rate Laws Differential rate laws for zero-, first-, and second-order reactions are described and explained. The differential rate law and the rate constant are determined for a reaction by examining how the rate of reaction varies with the reactant concentration.
Integrated Rate Laws Integrated rate laws for zero-, first-, and second-order reactions are described and explained. The rate law and the rate constant are determined for a reaction by preparing characteristic kinetics plots from concentration-time data.
Half-life The half-life of a reaction is defined and explained. The half-life is measured for various initial concentrations for zero-, first-, and second-order reactions. The data is analyzed graphically to determine the relationship between the half-life and reactant concentration for each order reaction and to determine the rate constant for each reaction.
Method of Initial Rates The determination of a rate law by the Method of Initial Rates is described. The rate law and rate constant for a reaction is determined using the Method of Initial Rates.
Isolation Method The determination of a rate law by the Isolation Method is described. The rate law and rate constant for a reaction is determined using the Isolation Method.
Kinetics of the Bromate-Bromide Ion Reaction The reaction between bromate ion and bromide ion in acidic aqueous solution is described. The rate law and rate constant for the bromate-bromide ion reaction is determined. A selection of solutions and a stopped-flow apparatus are available. Students must devise their own experimental strategy for determining the rate law and the rate constant.


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Last updated Tuesday January 14 2014