Small parts can swap places. One part comes in. It takes a spot. The old part leaves. This makes something new. It is like a game of musical chairs. 
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Sn2 Sn1 Graph en.png
Sn2EtCl+bromide.png
Sn2_reaction.gif
SN1 reaction mechanism.png
1-phenylethylchloride methanolysis.svg
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Content adapted from Wikipedia
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Readability: FK 12.5
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Vital Level 5