Tip:

A single replacement will always contain one element reacting with a compound to produce a different single element and a different compound.

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Example:

In a single replacement reaction, a single element reacts with a compound to produce a different single element and a different compound.

A + BC ---> AC + B

In a single replacement a "like element replaces the other "like" element.

A metal (cation) will replace another metal (cation).

A nonmetal (anion) will replace another nonmetal (anion).

Mg + FeCl2 ---> MgCl2 + Fe