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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Would the slope of a ln(k) versus 1/T plot (with temperature in kelvin) for a catalyzed reaction be more or less negative than the slope of the ln(k) versus 1/T plot for the uncatalyzed reaction? Explain. Assume both rate laws are first-order overall.

Interpretation Introduction

Interpretation: The rate laws for an uncatalyzed and a catalyzed reaction are given to be of the first-order overall. The comparison between the slope of a ln(k) versus 1T plot for a catalyzed and an uncatalyzed reaction is to be stated.

Concept introduction: The relationship between the rate constant and temperature is given by the Arrhenius equation, k=AeEaRT .

Explanation

To determine: A comparison between the slope of a ln(k) versus 1T plot for a catalyzed and an uncatalyzed reaction.

The relationship between the rate constant and temperature is given by the Arrhenius equation. The Arrhenius equation is,

k=AeEaRT

Where,

  • k is the rate constant.
  • A is the Arrhenius parameter.
  • Ea is the activation energy.
  • R is the universal gas constant.
  • T is the absolute temperature.

Take natural log on both sides in the above expression,

lnk=ln(AeEaRT)lnk=lnA+lneEaRTlnk=lnAEa<

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