Chemistry of the household . enters and alike appearance at the wire by which the current leavesthe water. The two gases have evidently come fromthe water and are the substances out of which it ismade for the water begins to disappear. By placing aninverted glass filled with water over each wire, thegases are easily collected. See Fig. 6. When onebottle is full of gas, the other will be only half full; andon decomposing the whole of a given amount of water,this proportion holds true. If we test these gases, we shall find them quite dif-ferent. The bottle which is full contains a gas called WAT
Chemistry of the household . enters and alike appearance at the wire by which the current leavesthe water. The two gases have evidently come fromthe water and are the substances out of which it ismade for the water begins to disappear. By placing aninverted glass filled with water over each wire, thegases are easily collected. See Fig. 6. When onebottle is full of gas, the other will be only half full; andon decomposing the whole of a given amount of water,this proportion holds true. If we test these gases, we shall find them quite dif-ferent. The bottle which is full contains a gas called WATER, 9 hydrogen. There is evidently twice as much of this byvolume in water as of the other gas which is calledoxygen. These two gases were tied together by whatis known as chemical force, but the electric currentseparated them and gave us an opportunity to makethe acquaintance of each by itself. We would hardlysuppose this clear, colorless liquid to be composed ofsuch material. On decomposing pure water from any rs HYDROGEN. Fig. 6. Decomposing Water Into Oxygen and Hy-drogen Gas. source, the proportion of oxygen to hydrogen is alwaysthe same, and in fact, all chemical compounds have acertain composition which never varies under any con-dition. The name hydrogen comes from two Greek words, meaning water and to produce. Hydrogen is interest^ ing as being the lightest common substance. It is an invisible gas like air, but unlike air will burn. If a Hydrogea 10 CHEMISTRY OF THE HOUSEHOLD. lighted candle be placed in a bottle of hydrogen, theflame will be at once extinguished, though the hydro-gen will take fire at the mouth of the bottle. Fig. will unite with other substances besidesoxygen; that is, it will join with other substances bychemical force. It forms a part of most animal andvegetable substances.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectc, booksubjectcookery
