On average, molecules found in the liquid state collide 100 times more frequently than the same molecules found in the gas state. That means we should be able to assume that reactions occur quicker in the liquid state than in the gas state because reactions require collisions. Now, this is not actually the case, and this is because of an effect called the effect of solvent molecules or Cage effect of solvent molecules. Now let's look at the following reaction. Suppose a red molecule must react with an orange molecule to produce a red orange product. Now, suppose we dissolve these guys in a liquid.