Calendar: 1880-1881 Page 679

APPLIED SCIENCES 679 How is hydrogen gas prepared from zinc and hydro- chloric acid from iron and steam Give the equations expressing the decompositions Describe the different steps in the extraction of bromine from sea water and give the equation illustrating its final ex- traction from potassium bromide by means of manganese dioxide and sulphuric acid Give the names and chemical formulas of the oxides of nitrogen and state how the second member of the series is prepared from copper and nitric acid Given ammonium carbonate and nitric acid how would you prepare nitrous oxide Explain the changes which take place in the reaction Give the chemical names and formulae of the following sal-ammoniac saltpetre green vitriol pearl ash fire damp and choke damp How is carbon dioxide prepared What is the action of its solution in water upon lime-water Point out the differences between the two oxides of carbon XL-Hfletallurgi Contrast the conditions necessary in the pudling process with those essential in the Bessemer process What are the characteristics of malleable iron cast iron and steel and to what are the differences between these substances due On what chemical reactions does the English method of extracting copper from its ores depend What impurities are usually associated with copper ores and at what stages of the smelting process are they removed If allowed to pass into the metal what effects would these impurities individually have Why cannot pig-iron containing phosphorus be used in the production of Bessemer steel in the ordinary form of converter Explain the important bearing which the recent