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In an aqueous or gaseous environment, when reactants spontaneously 'come apart,' we say they dissociate into products. The dissociation reaction can be written as

where reactants (moles of and moles of B) dissociate into products  c moles of and moles of D). The dissociation of and is continuous, as is the recombination of and D.
A better way to write the dissociation/recombination reaction is:

with a doubly sided arrow. The double arrow shows that reactants and products are in a dynamic equilibrium of dissociation and recombination.