Chemical KineticsUnits of Second-Order Rate Constant41Choose 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 KineticsActivation Energy and Reaction Rate42Choose the best answerA small activation energy generally means that:AFew molecules undergo effective collisions and the reaction is slow.BMore molecules can undergo effective collisions and the reaction is faster.CMolecules cannot undergo effective collisions.DRate becomes independent of temperature. Like 0 Discuss 0Share
Chemical KineticsDetermination of Overall Reaction Order43Choose the best answerFor the reaction X + 2Y → Products: Exp. 1: [X] = 0.05 M, [Y] = 0.10 M, Rate = 2.0 × 10⁻³ M s⁻¹ Exp. 2: [X] = 0.10 M, [Y] = 0.10 M, Rate = 8.0 × 10⁻³ M s⁻¹ Exp. 3: [X] = 0.10 M, [Y] = 0.20 M, Rate = 1.6 × 10⁻² M s⁻¹ What is the overall order of the reaction?A1B2C3D4 Like 0 Discuss 0Share1
Chemical KineticsZero-Order Reactions44Choose the best answerA reaction for which Rate = k is:AFirst orderBSecond orderCThird orderDZero order Like 0 Discuss 0Share
Chemical KineticsSurface Area and Reaction Rate45Choose 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