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Water molecules undergo intense hydrogen bonding between the oxygen and hydrogen atoms. This makes it significantly harder for the intermolecular forces to be overcome to melt ice. Conversely, H2S has dipole-dipole interactions (S being negative and H positive). While these dipole-dipole interactions are important, they are not nearly as strong as the hydrogen bonding in H2O, and hence, the lower melting point.
905416023 wrote:So hydrogen bonds make the molecule harder to break apart? So then they have a higher boiling point?
Yes, the strength of hydrogen bonds causes the molecules to have a greater intermolecular attraction which increases their melting and boiling points.
Hydrogen bonds are stronger than dipole/dipole or induced dipole/induced dipole interactions. H2O has the ability to hydrogen bond with itself because of the H-O bond, while H2S cannot. This accounts for H2O's higher melting point.
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