Say we are running a chemical reaction of some kind, in liquid, in a round bottom flask. We have a solvent, two reactants, a product, and the reaction is under stirring, reflux (volume maintained) and constant temperature. In my mind, if we simply double the volume of all the reactants and the solvent, and maintain the same reaction conditions, really it is only the concentrations of the reactants that matter. So ideally the product should be the same. Is this true? What other variables would make a double-batch reaction different than a standard batch? Why or how? Do nucleation sites, or interaction of the solvent with the vessel walls or air surface matter? I can be more specific about our reaction if necessary. Thanks.