First Principles of Chemistry: for the Use of Colleges And Schools
First Principles of Chemistry: for the Use of Colleges And Schools
Benjamin Silliman
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299. Tellurium is a very rare substance, more analogous to sulphur in its chemical relations than to the metals, with which it is usually classed. It is found native or alloyed with gold, and is also combined with bismuth, silver, &c. , in several very rare minerals, as telluric bismuth, graphic tellurium, and aurotellurite. When pure, it is a tin-white, brittle substance, with a metallic lustre, and a density of 6-26. It melts at low red- ness, is very volatile, and is a bad conductor of heat ...and electricity. It burns when strongly heated in the air, and forms tellurous acid, TcO a . Telluric acid, (TeO 3 ) can also be formed from tellurous acid, by a process which need not now be described. CLASS IV. 9. NITROGEN, OR AZOTE. * Equivalent, 14-06. Symbol, N. Density, -972. 300. Preparation and History. This gas forms four- fifths of the air we breathe, and is an essential constituent of most organic substances. It enters into a great variety of combinations. (3. ) Selenic acid. 299. What is tellurium?
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