human
How does changing pressure affect the position of equilibrium for a reversible reaction?
gpt
Increasing pressure causes equilibrium to shift towards the side with fewer gas molecules, while decreasing pressure causes it to shift towards the side with more gas molecules.
Explanation: This shift occurs to counteract the change in pressure and re-establish equilibrium.  Changes in pressure only affect equilibria where there are differences in the number of gas moles on either side of the reaction.