Final answer:
Having 1 arrow or 2 arrows in a dissociation reaction indicates the direction and reversibility of the reaction. An example is given for both types of reactions.
Step-by-step explanation:
The presence of 1 arrow or 2 arrows in a dissociation reaction indicates the direction of the reaction. When there is only 1 arrow, it means that the reaction proceeds in one direction only. On the other hand, when there are 2 arrows, it means that the reaction is reversible and can occur in both directions.
For example, in the dissociation reaction between HCl and H₂O, there is only 1 arrow because the reaction is almost 100% complete and goes from left to right. However, in a reversible reaction like the equilibrium between CH₂COOH and H₂O, there are 2 arrows to show that the reaction can occur in both the forward and reverse directions.
Having 1 arrow or 2 arrows in a dissociation reaction helps indicate the direction and reversibility of the reaction, providing important information about how the reaction proceeds under specific conditions.