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Arrhenius Equation for Reaction Rates

Explore the Arrhenius equation with its exponential form using the gas constant, temperature in Kelvin, exponential factor, frequency factor, and logarithmic form. Learn how to interpret an Arrhenius plot to determine activation energy and pre-exponential term. Enhance your understanding of reaction rates and molecular energy for chemical reactions.

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Arrhenius Equation for Reaction Rates

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  1. The Arrhenius equation

  2. Exponential form R = gas constant = 8.314 J K–1mol–1 T = temperature in kelvin • Exponential factor, e–Ea/RT: proportion of molecules that have sufficient energy for a reaction to take place • Pre-exponential term (frequency factor), A, accounts for the frequency of collisions with the correct orientation

  3. Logarithmic form • A plot of ln k against 1/T gives a downward straight line graph of the type y = mx + c • gradient m= –Ea/R • intercept on the y-axis, c= ln A.

  4. Graph of ln k against 1/T

  5. Ea from an Arrhenius plot

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