what does the arrow in a chemical equation mean? yields equals

Brief Explanations:

In a chemical equation, an arrow typically indicates the direction of the reaction. A single - headed arrow ($\rightarrow$) means the reaction proceeds in the forward direction from reactants to products. A double - headed arrow ($\leftrightarrow$) indicates a reversible reaction where the reaction can occur in both the forward and reverse directions.

Answer:

A single - headed arrow means the reaction proceeds in the forward direction from reactants to products, and a double - headed arrow indicates a reversible reaction.