This experiment is to study the relationship between the concentration of a reactant and the rate of reaction with respect to that reactant can be shown using rate–time graphs. Class discussion about why chemists study rates of reaction results in evaluating collision theory as a model for predicting rates of reactions. Rate cannot be directly measured, so instead chemists often measure the concentration of a reactant or volume of gaseous product as the reaction progresses. After analysing the concentration–time graph for the chemical reactions and decide whether the rate is zero order, first order or second order. Collisions are required for chemical reactions to take place and the rate depends on the number of successful collisions per second. The chemical kinetics lesson sequence is designed to exemplify a model-based inquiry approach to practical work in which students evaluate collision theory and rate equations as models for explaining rates of reactions. Understanding the rates of chemical reactions is important for controlling reactions in industry.
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