High School Chemistry . one part of hydrogen and one part of oxygenwhen mixed with another compound consisting of onepart of hydrogen and one of chlorine, may, by propertreatment be made to yield two new compounds whichwill also be mixed ; one of these is made up of one partof potassium and one part of chlorine, the other of twoparts of hydrogen and one of oxygen, OXYGEN. 41 The sum of all the atoms of any element on one sideof the equation must equal the sum of the atoms of thatsame element on the other side ; hence, the total numberof atoms on one side equals the total number on theother, an
High School Chemistry . one part of hydrogen and one part of oxygenwhen mixed with another compound consisting of onepart of hydrogen and one of chlorine, may, by propertreatment be made to yield two new compounds whichwill also be mixed ; one of these is made up of one partof potassium and one part of chlorine, the other of twoparts of hydrogen and one of oxygen, OXYGEN. 41 The sum of all the atoms of any element on one sideof the equation must equal the sum of the atoms of thatsame element on the other side ; hence, the total numberof atoms on one side equals the total number on theother, and the sum of the atomic weights on one side isidentical with the sum on the other side. CHAPTER —Oxygen. When water was decomposed by electricity two gaseswere obtained; one of these was oxygen ; and this chaptertreats of the preparation and the more important pro-perties of this substance. Experiments. I. Put a couple of grams of chlorate of potash in atest-tube fitted with a cork and delivery tube, as in FF3. 14. 14, then heat the tube ; when bubbles of gas come offfreely, hold a glowing splinter (one that is on fire but not 42 OXYGEN. blazing) close to the end of the delivery tube, or better,collect a tube full of the gas, as shown in the figure, andput the splinter in it. When the gas has ceased to comeoff lift the delivery tube out of the water, then removethe flame from under the tube, and when the latter hascooled, dissolve the white residue ; also dissolve a littlechlorate of potash separately, test each with a drop ofsilver nitrate solution. 2. Weigh out I gram of red oxide of mercury andplace in a test-tube fitted with a cork and delivery tube,as in Fig. 14. Heat uniformly at first so as not to breakthe glass. Oxygen is driven off, and collects in the up-right glass vessel standing in the pneumatic gas that collects at first should be thrown the tube containing the oxygen out of the waterand plunge a glowing splinter into it. Exami
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