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# Rate Equations

Physical

A2

Rate Equations

AQA Content

###### Define the terms 'order of reaction' and 'rate constant'

###### Perform calculations using the rate equation

###### Explain the qualitative effect of changes in temperature on the rate constant k

###### Perform calculations using the equation k = Aeâ€“Ea/RT

###### Understand that the equation k = Aeâ€“Ea/RT can be rearranged into the form ln k = â€“Ea /RT + ln A and know how to use this rearranged equation with experimental data to plot a straight line graph with slope â€“Ea/R

###### These equations and the gas constant, R, will be given when required.

Specification Notes

###### The rate of a chemical reaction is related to the concentration of reactants by a rate equation of the form:

###### Rate = k[A]m [B]n

###### where m and n are the orders of reaction with respect to reactants A and B and k is the rate constant.

###### The orders m and n are restricted to the values 0, 1, and 2.

###### The rate constant k varies with temperature as shown by the equation:

###### k = Aeâ€“Ea/RT

###### where A is a constant, known as the Arrhenius constant, Ea is the activation energy and T is the temperature in K.

Notes

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