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Topic 4.4 · Physical and Chemical Changes

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AP Chemistry · Topic 4.4: Physical and Chemical ChangesOpen topic

Original PrepAtlas question. This is not an official College Board question.

Liquid methanol, CH3OH, boils without decomposition. Which microscopic description best connects the phase change to the interactions involved?

AEvery O–H covalent bond breaks, releasing separate H atoms.BC–O bonds break and reform as C=O bonds in a new substance.CMethanol molecules become larger because their atoms expand to fill the gas volume.DMethanol molecules separate as intermolecular attractions are overcome, while their covalent structures remain intact.

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Topic 4.4 · Physical and Chemical Changes

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