A chemist runs four trials of the reaction and records the following initial…

CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics

Problem

A chemist runs four trials of the reaction

C \to \text{products}

and records the following initial conditions and rates: • Trial 1:

[C]_0 = 0.20\,\text{M}

T = 298\,\text{K}

, stirring on, rate =

0.015\,\text{M}\,\text{s}^{-1}

• Trial 2:

[C]_0 = 0.20\,\text{M}

T = 308\,\text{K}

, stirring on, rate =

0.031\,\text{M}\,\text{s}^{-1}

• Trial 3:

[C]_0 = 0.10\,\text{M}

T = 308\,\text{K}

, stirring on, rate =

0.015\,\text{M}\,\text{s}^{-1}

• Trial 4:

[C]_0 = 0.20\,\text{M}

T = 298\,\text{K}

, stirring off, rate =

0.010\,\text{M}\,\text{s}^{-1}

To evaluate the hypothesis that raising temperature doubles the rate by increasing the fraction of effective collisions, which pair of trials should the chemist compare to minimize confounding variables? (a) Trials 1 and 3 (b) Trials 1 and 4 (c) Trials 1 and 2 (d) Trials 2 and 3

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