Calendar: 1868-1869 Page 509

APPLIED SCIENCES 511 What chemical difference is there between an ordinary lime and hydraulic lime What practical means would you adopt to distinguish the two Sketch the process of iron smelting What is the difference between cast iron steel and wrought iron How is the presence of iron in solution ascertained Mention the chief compounds which iron forms with oxygen with sulphur and with chlorine giving the formulae for each What are the principal ores of lead Sketch the mechanical and chemical treatment of the ore required in smelting it How is the presence of lead in water ascertained How is copper extracted from its sulphide at Swansea Enumerate the most important ores of copper giving the formulae of each FIRST YEAR Express in symbols the materials employed to form the following mixtures and the chemical changes effected solutions of argentic nitrate and hydrodisodic phosphate powdered chalk and sal ammoniac when heated together solutions of cupric sulphate and dipotassic sulphide Give the atomic weights and the proportions in which the reactions occur What are the common impurities in spring water Give the tests by which each may be detected Explain the difference between hard and 80ft water What waters may be softened by boiling and what by sodic carbonate Explain the action in each case How is sulphuretted hydrogen obtained What is its action upon solutions of plumbic nitrate ferric chloride and caustic ammonia Describe the manufacture of oil of vitriol Give an outline of the process for making commercial carbonate of soda How is nitric acid obtained Give the reactions attending its preparation and state how nitrate may be recognised when in solution