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QUESTION

# How can you predict a single replacement reaction?

A single replacement reaction occurs when an element reacts with a compound to produce a new element and a new compound.

A single replacement reaction occurs when an element reacts with a compound to produce a new element and a new compound.

There are two types of :

A metal replaces another metal that is in solution: "A" + "BC" → "B" + "AC"Example: "Zn" + "CuCl"_2→ "Cu" + "ZnCl"_2

A halogen replaces another halogen that is in solution: "A" + "BC" → "C" + "BA"Example: "Br"_2 + "2KI" → "I"_2+ "2KBr"

To determine whether a given single replacement will occur, you must use an “Activity Series” table.

If the metal or the halogen is above the element it will replace based on the activity series, a single displacement reaction will occur.

Examples:

"Mg" + "2HCl" → "H"_2 + "MgCl"_2 ("Mg" is above "H")

"Cl"_2 + "2NaBr" → "Br"_2 + "2NaCl" ("Cl" is above "Br")

"Cu" + "AlCl"_3→ "no reaction" ("Cu" is below "Al")

The video below summarizes an experiment conducted to compare the activities of three metals ("Mg, Cu" and "Zn").