Four laboratory groups design experiments to test how temperature alone affects the…
CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics
Problem
Four laboratory groups design experiments to test how temperature alone affects the initial rate of the reaction A + B → products.
Group I: Conduct two trials at 20 °C and 40 °C using identical 0.10 M solutions of A and B in closed flasks that are continuously stirred.
Group II: Conduct two trials at 20 °C and 40 °C, but prepare the 40 °C solutions at 0.20 M to ensure a detectable rate.
Group III: Conduct both trials at 0.10 M and 0.20 M, respectively, at 30 °C to minimize temperature effects.
Group IV: Conduct trials at 20 °C and 40 °C with 0.10 M solutions but do not stir to avoid introducing mechanical energy.
Which group’s plan would most effectively isolate the influence of temperature on reaction rate?
(a) Group II
(b) Group IV
(c) Group I
(d) Group III