What does the arrow in a chemical equation represent?

• A. It shows the energy released in the reaction.
• B. It indicates that reactants react to form products.
• C. It denotes the speed of the reaction.
• D. It lists the reactants separately.

Answer: (B)

The arrow shows the direction of the chemical change, pointing from the substances on the left (reactants) to the substances on the right (products). It indicates what the starting materials are and what they become in the reaction. The arrow itself doesn’t tell you how much energy is released or absorbed, nor does it tell you how fast the reaction occurs—those ideas are shown separately (energy changes with symbols like delta H or heat, and rate depends on conditions). In some reactions, a double-headed arrow means the reaction can go in both directions. For example, in a simple reaction, you might see H2 + O2 -> H2O, where the arrow marks the transformation from reactants to product.