Calendar: 1860-1861 Page 496

APPLIED SCIENCES 497 VI -C imtetrj Which of the non-metallic elements are known in the aeriform condition Give the density of each of them in this state Mention their equivalent numbers Which of them have resisted liquefaction Explain and illustrate the law of multiple proportions Describe both in words and by symbols the changes which occur when hydrochloric acid is added to carbonate of baryta And state the relative proportions by weight in which these two bodies act upon each other What is meant by the term solution By what forces is it produced and limited Describe the cylinder electrical machine and explain its action Describe the construction and action of cell of Daniell's battery Explain the use of the Voltameter What are the chief chemical changes which occur when coal is burned in an open fire VII -CJjnttfatri What is meant by hard and sofl water How is the degree of hardness in water ascertained State how each of the essential constituents of water may be procured What are the chief natural sources of carbonic acid Give its composition density properties and mode of pre- paration How is deutoxide of nitrogen obtained By what cha- racters is it distinguished Describe the preparation of sulphuretted hydrogen and its leading properties State both in symbols and words its action upon sulphate of copper in solution How is hydrochloric acid obtained Give in symbols the