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Part 5 Chemistry Summary:

Sn1 Reactions: Step 2-Nucleophilic Attack

In the story, Cathy reaches out towards Nicole Underwood and asks her to join the group, just as the a carbocation and nucleophile will form a bond to end an Sn1 reaction. Cathy reaching towards Nicole represents the mutual attraction between two differently charged atoms. When Nicole joins the band,the band is stable and can perform in the contest easily, without the charge disrupting the group. The molecule is then stabilized, neutral, and there is no uneven distribution of charge.

Extended Summary here.