Chemical KineticsUnits of Second-Order Rate Constant26Choose the best answerThe unit of the rate constant for a second-order reaction involves:ANeither concentration nor timeBTime onlyCBoth concentration and timeDConcentration squared but no time Like 0 Discuss 0Share
Chemical KineticsZero-Order Reactions27Choose the best answerA reaction for which Rate = k is:AFirst orderBSecond orderCThird orderDZero order Like 0 Discuss 0Share
Chemical KineticsSurface Area and Reaction Rate28Choose the best answerIf the surface area of a solid reactant is increased, the order of reaction:ANecessarily increasesBNecessarily decreasesCRemains a property of the rate law and does not automatically changeDAlways becomes zero Like 0 Discuss 0Share
Chemical KineticsRate Law and Reaction Order29Choose 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 KineticsFirst-Order Rate Constant30Choose the best answerFor a first-order reaction, [A] = 2.0 mol dm⁻³ and Rate = 0.6 mol dm⁻³ s⁻¹. The rate constant is:A1 s⁻¹B0.3 s⁻¹C0.6 s⁻¹D0.9 s⁻¹ Like 0 Discuss 0Share