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===About Reversible Reactions===
: '''Reversible reactions''' use the symbol ⇌ to show that the [[Chemical Reaction|reaction]] can happen both ways.
:A [[Reaction Mixture|reaction mixture]] which can undergo a '''reversible reaction''' will reach a state of [[Dynamic Equilibrium|dynamic equilibrium]] where there is a constant amount of the [[reactant]]s and [[product]]s as the [[Chemical Reaction|reaction]] keeps happening in both directions. ===Examples===Hydrogen + Nitrogen ⇌ Ammonia <chem> 3H2(g) + N2(g) <=> 2NH3(g) </chem> Calcium Oxide + Carbon Dioxide ⇌ Calcium Carbonate <chem> CaO(aq) + CO2(g) <=> CaCO3(s) </chem> Ammonium Chloride ⇌ Ammonia + Hydrochloric Acid <chem> NH4Cl <=> NH3 + HCl </chem>