What is a Single-Replacement Reaction?

Single-Replacement Reactions
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Single-Replacement Reactions


A single-replacement reaction is when one element replaces a similar element in a compound. Now, a single-replacement reaction can also be called a single-displacement reaction. Either way, they mean the same thing. This is what one of those reactions might look like.


A plus BC, then after the reaction they become AC plus B. Notice nothing is being removed here, nothing is being added, B is just being replaced by A. Another type of reaction might be like this: D plus BC, after the reaction it becomes BD plus C. Again, nothing’s being added or removed, C is just being replaced by D.


That’s what a single-replacement reaction might look like theoretically. Now, the real world reaction problems are a little bit more complicated. I want to look at some of those, and I want to look at the categories that single-replacement reactions are put in. The first is replacement of a metal by a more active metal.


Here we have led, and then we have manganese, both of those are metals. Lead is being removed here, replaced by manganese, because that causes a more active metal. Then, we have replacement of hydrogen and water by a metal. Here, you have hydrogen and water. The hydrogen is removed and replaced with a metal.


Then, we have replacement of hydrogen in acid by a metal. Here, you have hydrogen in an acid. The hydrogen is removed, and it’s being replaced by a metal. Then, you have replacement of halogens. Bromine is a halogen that’s right there. Bromine is removed and is just replaced by chlorine.


The point of that type of reaction is just to remove the halogen, in that case bromine. Those are different types and different categories of single-placement reactions, or single-displacement reactions.



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Last updated: 10/23/2018

 

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