reactants and products in dynamic equilibria

[J_CHEN 4I]

Why is it that in chemical equilibria there is typically a greater concentration (or partial pressure) on one side of the reaction?

[Aiden Metzner 2C]

Because certain molecules are more stable then others so those are favored in reactions over unstable molecules.

[Helen Struble 2F]

The equilibrium either lies towards the reactants or towards the products, depending on how stable the chemical species on either side of the reaction are. More stable chemical species are less likely to participate in the reaction, so equilibrium tends to lie towards whichever side has more stable chemical species.

[Chantel_2I]

It is uncommon for the reactants and products to have the same stability, so the equilibrium lies toward the side that is more stable because a reaction in that direction will happen more readily.