. Elements of modern chemistry . with a green-ish-blue flame, forming tellurious oxide, TeO^. Its compoundwith hydrogen is a gas having an odor analogous to that ofhydrogen sulphide. The following table shows the analogy between the principalcompounds of sulphur, selenium, and tellurium: 112 ELEMENTS OF MODERN CHEMISTRY. Hydrogen sulphide. Sulphurous oxide. Sulphuric oxide. Sulphurous acid. Sulphuric acid. H^Se Hydrogen selenide. SeO^ Selenious oxide. [SeOT Selenic oxide. Selenious acid. Selenic acid. Hydrogen telluride. TeO^ Tellurious oxide. TeO^ Telluric acid. H^TeO* Tellur
. Elements of modern chemistry . with a green-ish-blue flame, forming tellurious oxide, TeO^. Its compoundwith hydrogen is a gas having an odor analogous to that ofhydrogen sulphide. The following table shows the analogy between the principalcompounds of sulphur, selenium, and tellurium: 112 ELEMENTS OF MODERN CHEMISTRY. Hydrogen sulphide. Sulphurous oxide. Sulphuric oxide. Sulphurous acid. Sulphuric acid. H^Se Hydrogen selenide. SeO^ Selenious oxide. [SeOT Selenic oxide. Selenious acid. Selenic acid. Hydrogen telluride. TeO^ Tellurious oxide. TeO^ Telluric acid. H^TeO* Telluric acid. CHLORINE. Density compared to air Density compared to hydrogen Atomic weight CI = Chlorine was discovered by Scheele in 1774, and was firstrecognized as an element by Gray-Lussac and Thenard in 1809,and by Sir Humphry Davy in 1810. It is one of the elementsof common salt, or sodium chloride. Preparation.—One part of manganese dioxide in coarsepowder and six parts of common hydrochloric acid are intro- 5. duced into a flask fitted with(Fig. 38). The reaction begins in the cold safety-tube and delivery-tubechlorine gas is CHLORINE. 113 disengaged, and may be collected over salt water. As soon asthe disengagement of gas diminishes, it may be re-establishedby the application of a gentle heat. It is more convenient to collect the gas by dry displacement,and it may be obtained pure and dry by being conductedthrough a wash-bottle containing a small quantity of water, anda tube containing calcium chloride, as represented in the is then passed, by means of a tube bent at a right angle,into a dry jar. The chlorine being heavier than the air, col-lects at the bottom of the jar and gradually drives out the air,and the uniform greenish color of the whole of the gas in thejar indicates when the latter is completely filled. If it be desired to prepare a solution of chlorine in water,the gas may be passed through a series of Wolffs bottles con-
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