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The rate constant, k, has the same value at all temperatures. True or False?

Question:

The rate constant, {eq}k {/eq}, has the same value at all temperatures.

True or False?

Rate constant:

A greater value of rate constant indicates that the reaction happens at a faster rate. Slow reactions will have a smaller value for their rate constant. The rate constant's unit is decided by its order.

Answer and Explanation: 1

The rate constant, k increases with rise in temperature. It is considered to be doubled with increase in temperature for every {eq}{\rm{10^\circ C}} {/eq}.The effect of the rate constant can be understood by the Arrhenius equation given below:

{eq}{\rm{K = A}}{{\rm{e}}^{^{\frac{{{\rm{ - Ea}}}}{{{\rm{RT}}}}}}} {/eq}

Where

  • A refers to the pre-exponential factor
  • {eq}{{\rm{E}}_{\rm{a}}} {/eq} refers to the activation energy
  • R refers to the gas constant
  • T refers to the temperature

So the rate constant, k will not have the same value at all temperatures.

Hence the statement is false.


Learn more about this topic:

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Rate Constant and Rate Laws

from

Chapter 12 / Lesson 2
13K

Learn what the rate law is and how the rate constant relates to it. Learn what reaction order is and how to determine reaction order when given experimental data containing concentration and reaction rate.


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