A product is a substance that forms as a result of a biological- or chemical reaction. A chemical reaction is a process that always results in the interconversion of Chemical substances The substance or substances initially involved in a chemical reaction are called While the end product of some chemical reactions may be the result of a relatively rapid reaction, nanoseconds to seconds, chemical equilibria in complex systems may require years or even centuries to be established. In a Chemical process, chemical equilibrium is the state in which the chemical activities or Concentrations of the reactants and products have no net change For example, equilibria in groundwater systems with multiple components are achieved on timescales of millennia, if ever. Groundwater is Water located beneath the Ground surface in Soil pore spaces and in the Fractures of lithologic formations When a chemical change occurs, reactants are rearranged. The result of these rearrangements is the formation of new, different substances (products)
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