Before revision: Reaction types Different variants of the arrow symbol are used to denote the type of a reaction: bro evilvage can never be defeted {|| style="text-align: center; padding-right: 0.5em;" | -> || net forward reaction|-| style="text-align: center; padding-right: 0.5em;" | File:Bi-dir reaction arrows.svg || reaction in both directions|-evilvage can never be defeted| style="text-align: center; padding-right: 0.5em;" | <=> || equilibrium|-| style="text-align: center; padding-right: 0.5em;" | = || stoichiometric relation|-| style="text-align: center; padding-right: 0.5em;" | <-> || resonance (not a reaction)|} State of matter To indicate physical state of a chemical, a symbol in parentheses may be appended to its formula: (s) for a solid, (l) for a liquid, (g) for a gas, and (aq) for an aqueous solution.
After revision: Reaction types Different variants of the arrow symbol are used to denote the type of a reaction: {|| style="text-align: center; padding-right: 0.5em;" | -> || net forward reaction|-| style="text-align: center; padding-right: 0.5em;" | File:Bi-dir reaction arrows.svg || reaction in both directions|-evilvage can never be defeted| style="text-align: center; padding-right: 0.5em;" | <=> || equilibrium|-| style="text-align: center; padding-right: 0.5em;" | = || stoichiometric relation|-| style="text-align: center; padding-right: 0.5em;" | <-> || resonance (not a reaction)|} State of matter To indicate physical state of a chemical, a symbol in parentheses may be appended to its formula: (s) for a solid, (l) for a liquid, (g) for a gas, and (aq) for an aqueous solution.