Rates of Reaction

Increasing the Pressure (in gases).

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 collide more frequently
with each other and the rate of the reaction increases.

If the reaction is reversible, then increasing the pressure
will favour the side of the reaction that has the smaller volume.
See the Haber process for further information.

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