Molecules that do not (or come apart) in solution are called . Most of these substances are covalently bonded (e. g., glucose, urea, and creatinine). In contrast, a(n) is any substance that dissociates in solution to form . Electrolytes include salts, acids, bases, and some charged proteins. The term electrolyte refers directly to the ability of these substances, when dissolved and dissociated in solution, to .