Chemical KineticsRate Law and Reaction Order21Choose the best answerFor the reaction 2A + B₂ → 2AB, experimental data show that the rate is independent of [A] but directly proportional to [B₂]. The rate law is:ARate = k[B₂]BRate = k[B₂]²CRate = k[A]²[B₂]²DRate = k[A]²[B₂] Like 0 Discuss 0Share
Chemical KineticsInstantaneous and Average Rate22Choose the best answerWhich statement is false?AFor a typical reaction whose rate decreases with time, the initial instantaneous rate is high.BThe activated complex has a very short lifetime.CA tangent to a concentration–time curve gives the average rate.DOnly a fraction of molecular collisions are effective. Like 0 Discuss 0Share
Chemical KineticsActivation Energy and Temperature Dependence23Choose the best answerIf the activation energy of a reaction is zero, its rate constant is:AStrongly increased by temperatureBDecreased by increasing temperatureCDecreased by decreasing temperatureDApproximately independent of temperature Like 0 Discuss 0Share
Chemical KineticsActivated Complex24Choose the best answerIn the pathway Reactants → Activated complex → Products, the activated complex has:AThe lowest energyBThe highest energyCThe same energy as the productsDThe same energy as the reactants Like 0 Discuss 0Share
Chemical KineticsPromoters and Activators25Choose the best answerA substance that increases the activity of a catalyst is called:AActivatorBPromoterCCatalyst poisonDBoth A and B Like 0 Discuss 0Share