Chemical KineticsForward and Reverse Activation Energies26Choose the best answerFor the exothermic reaction H₂ + Cl₂ → 2HCl, ΔH < 0. If Ef and Er are the forward and reverse activation energies, respectively:AEf > ErBEf < ErCEf = ErDΔH is unrelated to Ef and Er Like 0 Discuss 0Share
Chemical KineticsInstantaneous and Average Rate27Choose the best answerThe average rate approaches the instantaneous rate when the time interval:ABecomes very largeBBecomes negativeCApproaches zeroDBecomes exactly one second Like 0 Discuss 0Share
Chemical KineticsVariation of Reaction Rate with Time28Choose the best answerFor a typical reaction in which reactant concentrations decrease with time, the reaction rate generally:AIncreases continuouslyBDecreases as the reaction proceedsCAlways remains constantDBecomes infinite Like 0 Discuss 0Share
Chemical KineticsEffect of Concentration on First-Order Reaction29Choose the best answerA gaseous reaction is experimentally first order overall. If the vessel volume is reduced to one-third at constant temperature, the reactant concentration becomes three times larger. The reaction rate therefore becomes:AOne-third as largeBTwo-thirds as largeCThree times as largeDSix times as large Like 0 Discuss 0Share
Chemical KineticsEffect of Concentration on Reaction Rate30Choose the best answerThe _____ the concentration of reactants, the _____ the probability of collisions and hence the _____ the reaction rate.ALower, greater, greaterBHigher, greater, higherCHigher, lower, higherDLower, lower, higher Like 0 Discuss 0Share