* More Frequent Collisions: Higher concentration means there are more reactant molecules packed into the same volume. This leads to more frequent collisions between reactant molecules.
* Increased Probability of Effective Collisions: While more collisions are occurring, not all collisions are effective. Effective collisions require the molecules to collide with the correct orientation and sufficient energy to break bonds and form new ones. However, with more collisions, the probability of an effective collision also increases.
Therefore, the increased frequency and probability of effective collisions lead to a faster rate of reaction.