. Elements of chemistry ... be obtained by sev-eral processes, but in no instance without the presence ofwater, it being evolved only by the decomposition of thatfluid. The most convenient method, is to put fragments of iron Will an animal live in air which will not support combustion ? Will airwhich is unfit for respiration support combustion ? What precaution oughtalways to be taken before a person goes into a well or old cistern ? What isthe derivation of the word hydrogen? What is the weight of 100 cubic inchesof this gas? What is its weight when compared with air? How muchlighter is hydro
. Elements of chemistry ... be obtained by sev-eral processes, but in no instance without the presence ofwater, it being evolved only by the decomposition of thatfluid. The most convenient method, is to put fragments of iron Will an animal live in air which will not support combustion ? Will airwhich is unfit for respiration support combustion ? What precaution oughtalways to be taken before a person goes into a well or old cistern ? What isthe derivation of the word hydrogen? What is the weight of 100 cubic inchesof this gas? What is its weight when compared with air? How muchlighter is hydrogen than oxygen ? What substance is lighter than hydrogengas? What is said of its power to refract light? What is the electricalstate of this gas ? Can this gas be obtained without the presence of water ?Why? HYDROGEN. 141 Fig. or zinc into a proper vessel, and pour on them two parts byweight of sulphuric acid, diluted with 5 or 6 parts of hydrogen will immediately ascend through the waterin abundance. Where only small quantitiesof the gas are wanted, the sim-ple apparatus represented atFig. 57, is all that is consists of a Florence flaskinto which the zinc and acidare put, with a tube leadingunder a bell glass, or largetumbler filled with water, andinverted in a dish of the samefluid. Zinc, for this purpose,is better than iron, and is easilyprepared by melting, and while fluid, pouring it into water. The production of the hydrogen depends on the decom-position of the water which is effected by the united actionof the metal and acid. The metal, having an attraction foroxygen, obtains it from the water; this forms an oxide ofthe metal which is instantly dissolved by the acid ; the sur-face of the metal is thus left clean, and exposed to the water,from which it attracts another portion of
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