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Which of these did your answer include? high boiling and melting points: hydrogen bonds increase the amount of energy required for phase changes to occur, thereby raising the boiling and melting points. high specific heat: hydrogen bonds increase the amount of energy required for molecules to increase in speed, thereby raising the specific heat. lower density as a solid than as a liquid: hydrogen bonds increase the volume of the solid by holding molecules apart, thereby decreasing the density. high surface tension: hydrogen bonds produce strong intermolecular attractions, which increase surface tension.
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