Single replacement reactions. For example copper is more reactive than silver. So a copper wire in a silver solution will cause the silver to become a metal again.
Chemists use activity series to determine whether A SINGLE REPLACEMENT reaction will occur.
Activity series refers to a series of metals that are arranged in order of reactivity starting from the highest to the lowest. The series is used essentially to determine the products that are formed from single displacement reactions. A metal that is higher in the activity series will always replace a metal that is lower in the series if rhe two of them exist in the same solution. This is because, a metal that is higher in the series will be more reactive than a metal that is below in activity series.
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