**Code:**C.4.10.R.3**Spefication Reference:**4.6.1.2**Keywords:**Variables**Objectives:**Investigate how changes in concentration affect the rates of reactions by a method involving measuring the volume of a gas produced and a method involving a change in colour or turbidity.**Competency:**Draw and interpret graphs showing the quantity of product formed or quantity of reactant used up against time.**Proficiency:**Calculate the mean rate of a reaction from given information about the quantity of a reactant used or the quantity of a product formed and the time taken.**Mastery:**Calculate the gradient of a tangent to the curve on these graphs as a measure of rate of reaction at a specific time.

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