Chemical lecture experiments . einside of the cylinder. 6. Explosion with air or oxygen. — Air or oxygen, whenallowed to enter a confined volume of silicon hydride, pro-duces an explosion. SILICON TETRACHLORIDE 287 Twenty cubic centimeters of silicon hydride are collected ina 100 cc. cylinder, and one or two bubbles of air are allowedto rise inside the cylinder. A sharp explosion is obtained. If oxygen is admitted to a confined volume of the hydride,the greatest care must be exercised that not more than onebubble is introduced at a time. The conditions of this experiment may be reversed and ab
Chemical lecture experiments . einside of the cylinder. 6. Explosion with air or oxygen. — Air or oxygen, whenallowed to enter a confined volume of silicon hydride, pro-duces an explosion. SILICON TETRACHLORIDE 287 Twenty cubic centimeters of silicon hydride are collected ina 100 cc. cylinder, and one or two bubbles of air are allowedto rise inside the cylinder. A sharp explosion is obtained. If oxygen is admitted to a confined volume of the hydride,the greatest care must be exercised that not more than onebubble is introduced at a time. The conditions of this experiment may be reversed and abubble of silicon hydride allowed to enter a confined volumeof air or oxygen. The introduction of silicon hydride isbest made from the apparatus of Fig. 115, p. 285, whichadmits of a careful regulation of the flow of the gas. Pneumatic trough ; cylinders; 0 supply ; SiH4 supply. SILICON TETRACHLORIDE 7. Preparation by the action of chlorine on crude silicon. —A quantity of dry, crude silicon, prepared as in Ex. 1, is placed. Fig. 116 in a 50 cm. length of combustion tubing, through which drychlorine is conducted (Fig. 116). As the quantity of silicon 288 CHEMICAL LECTURE EXPERIMENTS tetrachloride formed varies greatly with the temperature,it is necessary to heat the tube in an air-bath consisting ofa tin or sheet-iron trough covered with a piece of asbestospaper. A thermometer is placed in the air-bath, whichshould be heated by means of a four-tube burner to 345° issuing gas is conducted through a U-tube immersed inice-water, and the silicon tetrachloride condenses to a lightyellow liquid. Si + 2 Cl2 = SiCl4. 50 cm. length combustion tubing ; air-bath ; four-tube burner ; ther-mometer ; U-tube immersed in ice-water; CI generator (Fig. 39,p. 81) ; crude silicon from Ex. 1. 8. Decomposition by moisture. — (a) Silicon tetrachloridefumes strongly in the air, from which it abstracts reaction is accompanied by a liberation of hydrochloricacid and a white powd
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