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The activity series of metals lists the metals in order of reactivity, with the most reactive metals listed at the top, and the least reactive metals listed at the bottom. When determining the results of a single replacement (displacement) reaction, you compare the two metals according to their location on the list. If the elemental metal is higher on the list, it will replace the other metal in the compound. For example, Al + 3AgNO3 --> 3Ag + Al(NO3)3 occurs because the metal aluminum, Al, is higher than silver, Ag, on the metal reactivity list, and replaces the silver in the silver nitrate, AgNO3, to form elemental silver, Ag, and the compound aluminum nitrate, Al(NO3)3. The reverse reaction, 3Ag + Al(NO3)3 --> Al + 3Ag(NO3)3 will not occur, because the silver is lower on the list than aluminum, and cannot replace the aluminum in the aluminum nitrate, so the correct equation is Ag + Al(NO3)3 --> n.r. (which means "no reaction").

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Guido Larkin

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3y ago

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