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A reversible chemical reaction will be noted with two arrows and will have an equilibrium constant. Reactions that proceed completely from reactants to products are denoted with a one-way arrow and do not have equilibrium constants.
Most of the time if its a chemical reaction, you can tell by the arrows, if it is an equilibrium arrow, its reversible and if it is a one sided arrow, it is irreversible. However when it comes to change of state and matter, processes like melting and freezing etc are usually reversible as they are temperature dependent, which can be controlled.
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