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Rates of Reaction

What is the Effect of Increasing the Pressure
on the Rate of a Chemical Reaction?

Increasing the pressure of a reaction where the reactant
is a gas is similar to increasing the concentration of a
reactant in a solution. The gas particles (usually molecules)
will be closer together when the pressure increases.
This means that the particles will collide more frequently
and the rate of the chemical reaction will increase.

If the reaction is reversible then increasing the pressure
favours the side of the reaction that has the smaller volume.
See the Le Chatelier's principle for further information.

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