Salt A salt is the product of the neutralisation of an acid by a base. Salts are usually ionic solids. A salt bridge is the linking structure, consisting of a viscous gel of saturated sodium chloride in a glass tube, used to connect two half cells . Saturated Compound A saturated compound is one in which all the atoms are linked by single bonds .
Saturated compounds react with other compounds by undergoing substitution reactions .
If a saturated compound undergoes an elimination reaction, an unsaturated compound is formed. A secondary cell is an electrochemical cell for the production of electricity. After use the secondary cell can be recharged by passing an electric current through the cell in the opposite direction to that delivered during use. Secondary Standard A secondary standard is a working standard material which is used in the laboratory as a working standard, and which has been calibrated against a primary standard material of known composition. Secondary Treatment Secondary treatment involves the biochemical oxidation of a sewage or trade effluent to meet the standards before its discharge to the aquatic environment.