Chemical KineticsConcentration-Time Curve and Reaction Rate21Choose the best answerDuring a reaction, the concentration–time curve initially changes rapidly but becomes nearly horizontal after a long time. In this nearly horizontal region, the concentration changes very little with time. What does this indicate?AReaction rate is maximumBReaction rate is rapidly increasingCReaction rate is approximately zeroDConcentration is changing rapidly Like 0 Discuss 0Share
Chemical KineticsEffect of Concentration on Reaction Rate22Choose the best answerWood burns faster in pure O₂ than in air because the concentration of oxygen in pure O₂ is approximately:A3 times greaterB4 times greaterC5 times greaterD7 times greater Like 0 Discuss 0Share
Chemical KineticsRate of Appearance of Products23Choose the best answerFor the reaction 2A ⇌ 4B + C, the concentration of B increases by 5 × 10⁻³ mol L⁻¹ in 10 s. The rate of appearance of B is:A5 × 10⁻⁴ mol L⁻¹ s⁻¹B5 × 10⁻³ mol L⁻¹ s⁻¹C6 × 10⁻⁵ mol L⁻¹ s⁻¹D4 × 10⁻⁴ mol L⁻¹ s⁻¹ Like 0 Discuss 0Share
Chemical KineticsDetermination of Reaction Order24Choose the best answerIf doubling [A] increases the rate fourfold and tripling [A] increases the rate ninefold, the rate is proportional to:A[A]B[A]²C√[A]D[A]³ Like 0 Discuss 0Share
Chemical KineticsDetermination of Overall Reaction Order25Choose 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 9 Discuss 0Share2