What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.26.1.1And use the terms rate equation, order• Explain and use the terms rate equation, order of reaction, overall order of reaction, rate constant, half-life, rate-determining step and intermediateSyllabus objective26.1.2Rate equations and reaction order• The initial rates method and half-life method- (a) understand and use rate equations of the form rate = k [A]m[B]n (for which m and n are 0, 1 or 2)- (b) deduce the order of a reaction from concentration–time graphs or from experimental data relating to- (c) interpret experimental data in graphical form, including concentration–time and rate–concentration graphs- (d) calculate an initial rate using concentration data- (e) construct a rate equationSyllabus objective26.1.3Show understanding that the half-life• (a) show understanding that the half-life of a first-order reaction is independent of concentration: (b) use the half-life of a first-order reaction in calculationsSyllabus objective26.1.4The numerical value of a rate constant, e.g• Calculate the numerical value of a rate constant, e.g. by:- (a) using the initial rates and the rate equation- (b) using the half-life, t- 2- 1 , and the equation k = 0.693 / t- 2- 1Syllabus objective26.1.5Mechanisms and rate-determining step• For a multi-step reaction:- (a) suggest a reaction mechanism that is consistent with the rate equation and the equation for the overall reaction- (b) predict the order that would result from a given reaction mechanism and rate-determining step- (c) deduce a rate equation using a given reaction mechanism and rate-determining step for a given reaction- (d) identify an intermediate or catalyst from a given reaction mechanism- (e) identify the rate determining step from a rate equation and a given reaction mechanismSyllabus objective26.1.6Effect of temperature change on the rate• Describe qualitatively the effect of temperature change on the rate constant and hence the rate of a reactionSyllabus objective