The liquid-phase reaction is carried out in an isothermal batch reactor. Both reactions are first-order. The activation energy of the first reaction, , is lower than the activation energy of the second reaction, . In this Demonstration you can vary the temperature of the reaction and the selectivity ), which is a function of time because the reactions have different activation energies. The concentrations of the reactants and products are also plotted as functions of time. Note that the time scale in the plots changes when the temperature increases from 465 K to 466 K.