Ashley Olsen and her twin sister Mary-Kate Olsen were professional actors before they could speak. A TV executive held the twins in his arms when they were three or maybe nine months old (accounts vary), and neither girl cried. On the basis of this audition, the Olsen twins landed the shared role of baby Michelle on Full House, when they weren't even toddlers. They were nine when the show finally ended.
Recall the relationship between the forward and reverse reaction rates when a reaction is at equilibrium. In a chemical equilibrium, the forward and reverse reactions occur at equal rates, and the concentrations of products and reactants remain constant.
Reactions occur all the time. However, certain prequisites must be fulfiled before a reaction can occur. You cannot say, expect a reaction to occur between one substance and another if you keep both of them separated. Therefore, one theory that discusses how reactions occur is The collision theory. In the collision theory, for the reaction to occur reactants involved together must: Collide with the right orientation. Collide with sufficient energy.