When does a single replacement reaction occur?

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When does a single replacement reaction occur?

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Answer 1 · 2014-01-25T16:59:28

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

Explanation:

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 single replacement reactions:

A metal replaces another metal that is in solution:
$A + BC \to B + AC$ $"A" + "BC" → "B" + "AC"$
Example: $Zn + {CuCl}_{2} \to Cu + {ZnCl}_{2}$ $"Zn" + "CuCl"_2→ "Cu" + "ZnCl"_2$

A halogen replaces another halogen that is in solution:
$A + BC \to C + BA$ $"A" + "BC" → "C" + "BA"$
Example: ${Br}_{2} + 2KI \to I_{2} + 2KBr$ $"Br"_2 + "2KI" → "I"_2+ "2KBr"$

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

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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:

$Mg + 2HCl \to H_{2} + {MgCl}_{2}$ $"Mg" + "2HCl" → "H"_2 + "MgCl"_2$ ( $Mg$ $"Mg"$ is above $H$ $"H"$ )

${Cl}_{2} + 2NaBr \to {Br}_{2} + 2NaCl$ $"Cl"_2 + "2NaBr" → "Br"_2 + "2NaCl"$ ( $Cl$ $"Cl"$ is above $Br$ $"Br"$ )

$Cu + {AlCl}_{3} \to no reaction$ $"Cu" + "AlCl"_3→ "no reaction"$ ( $Cu$ $"Cu"$ is below $Al$ $"Al"$ )

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

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When does a single replacement reaction occur?

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