Apentix/AP Chemistry/Unit 3: Intermolecular Forces and Properties/Question
AP Chemistryhardmcq1 pt

Graphene, a single planar sheet of carbon atoms, conducts electricity exceptionally well. Which bonding description explains this conductivity?

A.Carbon atoms alternate positive and negative charges that migrate through the sheet
B.Each carbon bonds to only three neighbors, leaving one electron per atom delocalized across the sheet
C.Hydrogen bonds between carbon atoms provide a pathway for charge
D.Weak dispersion forces let electrons hop between separate graphene molecules

Explanation

Core Concept

Every graphene carbon uses three valence electrons for localized bonds to its nearest neighbors in a hexagonal pattern. The fourth electron occupies an orbital spread over the entire sheet, creating a continuous delocalized system through which charge flows freely, much like the electron sea of a metal. Diamond ties up all four electrons in localized tetrahedral bonds, which is why it insulates. Delocalization plus the flat, uninterrupted network makes graphene a superb conductor.

Correct Answer

BEach carbon bonds to only three neighbors, leaving one electron per atom delocalized across the sheet

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