. Introduction to inorganic chemistry . Fig. H. 20 INORGANIC CHEMISTEY. Fm. 12. as the current of electricity is employed, and that electricity is con-sumed in the process. Very many substances can be decomposed in this The inverse of this is ^)\^ likewise familiar. If we A Nv^ place in dilute sulphuric acid a stick of the metalzinc, we find that a gasis given off rapidly (), that the zinc gradu-ally dissolves, and that alarge amount of heat isdeveloped. Under favor-able circumstances, theliquid may even rise spon-taneously to the boiling-point. This form of theaction produces heat
. Introduction to inorganic chemistry . Fig. H. 20 INORGANIC CHEMISTEY. Fm. 12. as the current of electricity is employed, and that electricity is con-sumed in the process. Very many substances can be decomposed in this The inverse of this is ^)\^ likewise familiar. If we A Nv^ place in dilute sulphuric acid a stick of the metalzinc, we find that a gasis given off rapidly (), that the zinc gradu-ally dissolves, and that alarge amount of heat isdeveloped. Under favor-able circumstances, theliquid may even rise spon-taneously to the boiling-point. This form of theaction produces heat. If,however, we attach the same stick of zinc to a copper wire, and,having provided a plate of platinum also connected 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, h
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