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What do the symbols for solid, liquid, and gas mean in a chemical equation?

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chemistry A ball-and-stick model of molecular structure, showing atoms bonded together.

In a chemical equation, the symbols placed in parentheses after a chemical formula indicate the physical state of the substance at the time of the reaction. These symbols are used to specify whether a reactant or product exists as a solid, liquid, or gas.1

The standard symbols are:

(s): Represents a solid.1
(l): Represents a liquid.1
(g): Represents a gas.1

By including these notations, chemists can clearly define the state of matter for each component involved in a chemical reaction, providing essential context for how the substances interact.1