. Introduction to inorganic chemistry . ected with a wire,immerse the two simultaneously in the acid(Fig. 14), then a galvanometer, with which thewires are connected, shows at once the passageof a current of electricity round the the same chemical change goes on asbefore. The sole difference is that the gasappears to arise from the surface of the plati-num. It is easy to show, however, that the plat-inum by itself is not acted upon by dilute acids,and, in this case, undergoes no change whatever;it serves simply as a suitable conductor for theelectricity. Here, then, in place of
. Introduction to inorganic chemistry . ected with a wire,immerse the two simultaneously in the acid(Fig. 14), then a galvanometer, with which thewires are connected, shows at once the passageof a current of electricity round the the same chemical change goes on asbefore. The sole difference is that the gasappears to arise from the surface of the plati-num. It is easy to show, however, that the plat-inum by itself is not acted upon by dilute acids,and, in this case, undergoes no change whatever;it serves simply as a suitable conductor for theelectricity. Here, then, in place of the heatwhich the first plan produced, we get arrangement is, in fact, a battery, for a bat-tery is a system in which a chemical action whichwould otherwise give heat furnishes electricity in-stead. Thus, electricity may be consumed or pro-duced in connection with a change in composition. Even violent rubbing in a mortar, in the case of some substances,can effect an appreciable amount of decomposition in a few Fig. 13. INTRODUCTORY II 21 In tliis way silver chloride can be separated into silver and chlorine,just as by light. It is the mechanical energy which is the agent, andpart of it is consumed in producing the change, and only the balanceappears as heat. Conversely, ilii& production of mechanical energy, as
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