Security Stud. 1  Full mortise hinges are available with security studs for added safety. 2  With the door in its closed position, a stud attached to one leaf of the hinge projects into a hole in the matching leaf.
Net Ionic Equation. A chemical reaction involves the conversion of reactant atoms or molecules to product. During any chemical reaction, reactant molecules are joined together to form a product which has different chemical and physical properties than the reactants.
It is the solubility of an ionic compound (strong electrolyte) which determines whether you write (s) or (aq) in the molecular equation, and whether you write it in undissociated form or dissociate it into ions in the net ionic equation.