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How can I tell the difference between a single-replacement reaction and a double replacement reaction?

Respuesta :

Single replacement is a reaction in which one element reacts with another compund to form another compound and another element.

example:

A+BC > B+ AC

Double Replacement is a reaction in which the metals present in two compounds change places to form two new compounds 

example:

AB+ CD > AD+ CB (they basically switch partners)