High School Chemistry . art of theplate by themselves. Next try the effect of diluting the acidDoes the hydrogen come from the strong acid or from the water 7 11. Point out the resemblances between the gas obtained by theaction of zinc and sulphuric acid, sodium and water, and one ofthose that resulted from the decomposition of water by electricity. 12. If there were two jars, one full of hydrogen and the other fullof air, how could you find out which jar contained each gas.* 13. What reasons are there for believing that when hydrogenburns, chemical combination is going on. 30 EXERCISES. 14. T
High School Chemistry . art of theplate by themselves. Next try the effect of diluting the acidDoes the hydrogen come from the strong acid or from the water 7 11. Point out the resemblances between the gas obtained by theaction of zinc and sulphuric acid, sodium and water, and one ofthose that resulted from the decomposition of water by electricity. 12. If there were two jars, one full of hydrogen and the other fullof air, how could you find out which jar contained each gas.* 13. What reasons are there for believing that when hydrogenburns, chemical combination is going on. 30 EXERCISES. 14. Take two rubber bags, and fill one with hydrogen, theother with oxygen. Subject both bags to an equal amount ofpressure between two boards, or otherwise, then connect them withthe apparatus known as the oxy-hydrogen blow-pipe, and havingturned on the hydrogen, ignite it, then carefully and verygradually turn on oxygen gas from the other bag. A form of blow-pipe apparatus is represented in Fig. 11. Gas holders may be sub-. Fio. 11. stituted for the rubber bags, if more convenient ; but the gasshould be driven out with considerable force. 15. Introduce into the oxy-hydrogen flame, separately, a piece ofplatinum wire, of steel, of zinc and of quick-lime. 16. Use an ordinary mouth blow-pipe and connect it with asupply of oxygen by means of a rubber tube ; when the gas isescaping under pressure hold the nozzle horizontally in a lamp orgas flame. Try this for heating effect. 17. If sodium forms a compound with water when thrown uponit, where is that compound ? Devise an experiment to test thecorrectness of your answer. 4.—Additional Exercises. I. To avoid any risk of explosion in the preparation of hydrogen,sodium amalgam may be used instead of sodium. The amalgam isprepared as follows :—Drop into a four or five inch test-tube abouta half of a cubic centimetre of mercury, heat this to boiling, thenthrow into it bits of sodium cut small. Be careful to keep themouth of the test-tube
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