Chemistry of the household . Wei have learned how stored up chemical energyis changed into heat and force in the stove and in thehuman body; but in the electric cell, chemical energyis changed into electrical energy. If a strip of pure zinc be placed in a weak solutionof acid, no chemical action takes place. Place in thesame solution a strip of sheet copper and again noaction takes place; but let the copper and the zinc bebrought in contact, or connected by a copper wire, andimmediately vigorous chemical action will begin at thesurface of the copper plate; bubbles of hydrogen col-lecting there
Chemistry of the household . Wei have learned how stored up chemical energyis changed into heat and force in the stove and in thehuman body; but in the electric cell, chemical energyis changed into electrical energy. If a strip of pure zinc be placed in a weak solutionof acid, no chemical action takes place. Place in thesame solution a strip of sheet copper and again noaction takes place; but let the copper and the zinc bebrought in contact, or connected by a copper wire, andimmediately vigorous chemical action will begin at thesurface of the copper plate; bubbles of hydrogen col-lecting there. This action is as follows: the zinc dis- Whitewash A VoltaicCell io6 CHEMISTRY OF THE HOUSEHOLD. solves in the acid and hydrogen is set free. Thishydrogen travels with an electric current set up in theliquid, passing from particle to particle through theliquid until it reaches the copper. Here the hydrogenstops, but the electric current passes up the copperplate and over the wire to the zinc and down that ^o LeclancheCell.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectc, booksubjectcookery
