In a separate investigation of the same reaction

CHEMISTRY · Single correct · AP · Chemistry · Kinetics · Kinetics

Problem

In a separate investigation of the same reaction, the following results were obtained: • Trial 1:

[A]_0 = 0.300\,\text{M}

t_{1/2}=45\,\text{s}

• Trial 2:

[A]_0 = 0.100\,\text{M}

t_{1/2}=135\,\text{s}

Based on these measurements, which statement is most consistent with the behavior of the reaction? (a) The reaction is first order because the half-life is nearly unchanged. (b) The reaction is zero order because the half-life increases as the concentration decreases. (c) The reaction is second order because the half-life triples when the concentration is decreased by a factor of three. (d) The reaction is third order because the rate is highly sensitive to concentration changes.

Related theory

Chemical Kinetics
Order rate equations
Integrated Rate Equations

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