. An introductory course of lessons and exercises in chemistry (rewritten 1919). tory Chemistry mixture composed of approximately two parts of potassium chlorate andone part manganese dioxide (powdered). Be careful to keep paper,pieces of cork, and other combustibles out of this mixture. In the next operation, two students should work together. They shouldsecure a water basin, four wide-mouth bottles, and four pieces of glasslarge enough to cover the mouths of tbe bottles. Assemble the whole as ^ C G A burner for BendingGlass Tubing A Correctly Bent. B St C Incorrectly Bent- shown in the accom
. An introductory course of lessons and exercises in chemistry (rewritten 1919). tory Chemistry mixture composed of approximately two parts of potassium chlorate andone part manganese dioxide (powdered). Be careful to keep paper,pieces of cork, and other combustibles out of this mixture. In the next operation, two students should work together. They shouldsecure a water basin, four wide-mouth bottles, and four pieces of glasslarge enough to cover the mouths of tbe bottles. Assemble the whole as ^ C G A burner for BendingGlass Tubing A Correctly Bent. B St C Incorrectly Bent- shown in the accompanying figure; heat the potassium chlorate and col-lect the gas. Secure a deflagrating spoon, put a small piece of charcoalin it, heat this in a burner Maine, and lower it into one of the this same way, proceed to burn sulphur in another bottle, phosphorusin a third, and a small piece of sodium in the fourth. Add a little dis-tilled water to each of the bottles; shake the bottles with it so that theproducts of combustion may be absorbed by the water, and drop into. each of the first three bottles a piece of blue litmus paper, and into thefourth bottle a piece of red litmus paper. The instructor will show theburning of iron (picture cord) in oxygen. Record in your note book allobservations made in connection with this experiment. What propertiesof oxygen gas—solubility, etc.—has this experiment revealed? 5. The Chemical Combining of Oxygen with Other Elements. The above experiment introduced the student to a chemicalchange which is the reverse—in a sense—of the separation of Chapter II 21 oxygen from substances,—namely, the combining of oxygen withsubstances. The substances burned combine with oxygen in defi-nite relative amounts by weight. Thus 3 parts of carbon (char-coal) combine with 8 parts by weight of oxygen, and. this is ex-pressed by writing C02—which means 12 parts by weight ofcarbon to 32 parts by weight of oxygen, and hence the same as3 :8. Th
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectchemistry, bookyear19
