High School Chemistry . r with a largetube, into the top and bottom of which pass tightly-fittingcorks perforated with tubes, admitting steam at the topand giving exit to it at the bottom, Fig. 18. The wires 70 COMPOSITION OF STEAM. from the battery to the eudiometer should pass into the jacket through itsupper cork. Afterthe steam has beenadmitted, mark theheight of the mer-cury above that inthe trough, and alsothe volume of thecontained gases,thenexplode them. Af-ter explosion de-press the eudio-meter, until the mer-cury in the tube stands the same height above that inthe trough as before. T
High School Chemistry . r with a largetube, into the top and bottom of which pass tightly-fittingcorks perforated with tubes, admitting steam at the topand giving exit to it at the bottom, Fig. 18. The wires 70 COMPOSITION OF STEAM. from the battery to the eudiometer should pass into the jacket through itsupper cork. Afterthe steam has beenadmitted, mark theheight of the mer-cury above that inthe trough, and alsothe volume of thecontained gases,thenexplode them. Af-ter explosion de-press the eudio-meter, until the mer-cury in the tube stands the same height above that inthe trough as before. Then measure the volume of thewater-gas (steam) in the eudiometer, and compare thisvolume with that of the original mixture. If we represent equal volumes of oxygen and ofhydrogen by equal squares, and then place in thesesquares the first letter of the name of these elements, wecan represent to the eye, by another figure, the volumeof water-gas or steam formed, and the diminution involume which occurs after union. Thus :. I vol. H I vol. H y + vol. o 2 vols. Steam J How would you account for the change of volume ? DEFINITE PROPORTIONS. 71 CHAPTER XV. Definite Proportions- The object of this chapter is to show that chemicalaction, whether of combination or decomposition, takesplace only between definite weights of the constituents. Experiments. 1. Into a hard glass tube, A, Fig. 19, introduce a weighedquantity of copper oxide. About one gram is a convenientportion to work with. Pass a jet of dry hydrogen throughthis tube and after all air is expelled heat the tube andcontained oxide to redness. Find the weight of theremaining copper. From the result of your workcalculate the weight of oxygen that unites with 6ysparts, by weight of copper. 2. Alter the last experiment by heating the copperthat was left in the tube, in a current of air, and findthe weight of the black substance (copper oxide) that isformed. Calculate how many parts of oxygen unite with63 5 parts of copper. Note.—
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