Berzelius, Jöns Jakob, Essai sur la théorie des proportions chimiques et sur l' influence chimique de l' électricité

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              <pb o="97" file="0117" n="117" rhead="DES PROPORTIONS CHIMIQUES."/>
            couvrent le plus vite ces caractères. </s>
            <s xml:id="echoid-s1019" xml:space="preserve">A une tempé-
              <lb/>
            rature très-élevée, au degré de la chaleur blanche,
              <lb/>
            par exemple, cette restauration a lieu quelque-
              <lb/>
            fois tout d’un coup; </s>
            <s xml:id="echoid-s1020" xml:space="preserve">mais à une moindre tempéra-
              <lb/>
            ture, comme, par exemple, à celle de la distilla-
              <lb/>
            tion sèche, on voit encore paraître des matières
              <lb/>
            qui, par leur composition et leur polarité, pré-
              <lb/>
            sentent une modification des substances organi-
              <lb/>
            ques, comme, par exemple, le vinaigre, l’huile
              <lb/>
            empyreumatique, l’ammoniaque. </s>
            <s xml:id="echoid-s1021" xml:space="preserve">Qui croirait
              <lb/>
            que l’azote, si fortement électro-négatif dans la
              <lb/>
            nature inorganique, ou que son radical présumé,
              <lb/>
            le nitricum, peut produire avec l’hydrogène,
              <lb/>
            qui est si faiblement électro-positif, une combi-
              <lb/>
            naison telle que l’ammoniaque, douée de pro-
              <lb/>
            priétés si électro-positives qu’elle rivalise avec les
              <lb/>
            oxides les plus positifs? </s>
            <s xml:id="echoid-s1022" xml:space="preserve">Sans cette modification
              <lb/>
            de polarité électrique, qui n’appartient qu’aux
              <lb/>
            oxides à plusieurs radicaux, et qui n’existe que
              <lb/>
            dans la nature organique ou ses produits, ce
              <lb/>
            phénomène ne serait pas concevable. </s>
            <s xml:id="echoid-s1023" xml:space="preserve">C’est pro-
              <lb/>
            bablement à la faveur de cette modification, que
              <lb/>
            le nitricum, combiné avec l’hydrogène, s’amal-
              <lb/>
            game avec le mercure, et présente dans cette
              <lb/>
            combinaison un corps électro - positif analogue
              <lb/>
            aux radicaux métalliques des autres alcalis.</s>
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            <s xml:id="echoid-s1025" xml:space="preserve">Si le point de vue électro-chimique est juste,
              <lb/>
            il s’ensuit que toute combinaison chimique dé-
              <lb/>
            pend uniquement de deux forces opposées, </s>
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