10.6 Covalent structures — Visual & Photo Quiz

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Look at the molecular model of simple covalent methane (CH₄) versus giant covalent silicon dioxide (quartz). Why does methane boil at -161°C while quartz melts at 1713°C?

Methane has weak intermolecular forces between molecules, whereas quartz is a giant covalent network requiring strong covalent bonds to break

Methane has ionic bonds that dissolve easily

Quartz is an electrical conductor made of pure lead

Methane contains no chemical bonds