UHS MDCAT 2023 ChemistryUHS MDCAT 2023 Past Paper#Chemical Kinetics#Rate Law36Choose the best answerIf a concentration–time curve is steeper near the start, the reaction rate at that time is:AConstantBEquilibriumCGreaterDLesser Like 0 Discuss 0Share
Chemical KineticsFirst-Order Rate Constant37Choose 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
Chemical KineticsRate Law and Reaction Order38Choose 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 equilibrium 01Chemical equilibrium #Chemical Kinetics#Rate Law39Choose the best answerFor the elementary reaction 2A ⇌ B, the forward reaction rate is proportional to:A[A]B[A]²C[B]D[B]² Like 0 Discuss 0Share
BUMHS MDCAT 2025 Chemistry#Activation Energy#Chemical Kinetics40Choose the best answerThe activation energy of a reaction is usually: (BUMHS MDCAT 2025)AUnaffected by the process of a catalyst.BLow for the reaction that takes place slowly.CDifferent for the forward and backward reaction.DIncreases with rise in temperature. Like 1 Discuss 0Share