Intermolecular Forces - Hydrogen Bonding, Dipole Dipole Interactions - Boiling Point & Solubility

The Organic Chemistry Tutor7 minutes read

Dipole-dipole interactions happen in polar molecules with partial charges attracting each other. Hydrogen bonding, a special case of dipole-dipole interactions, results in stronger intermolecular forces in molecules like ammonia and methanol, leading to higher boiling points and water solubility.

Insights

  • Dipole-dipole interactions between polar molecules like acetone and carbon monoxide create attractions between partial charges, influencing intermolecular forces.
  • Hydrogen bonding, a special dipole-dipole interaction, occurs in molecules like water, ammonia, and methanol, leading to stronger forces, higher boiling points, and increased solubility in water.

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Recent questions

  • What are dipole-dipole interactions?

    Dipole-dipole interactions occur between polar molecules, where partial charges attract each other, creating a dipole-dipole interaction.

  • How do hydrogen bonds form?

    Hydrogen bonding occurs when hydrogen is attached to nitrogen, oxygen, or fluorine.

  • What is the impact of hydrogen bonding on boiling points?

    Molecules with hydrogen bonding have higher boiling points due to stronger intermolecular forces.

  • How does hydrogen bonding affect water solubility?

    Hydrogen bonding increases water solubility in molecules.

  • Why do molecules with hydrogen bonding have higher boiling points?

    Hydrogen bonds in molecules lead to stronger intermolecular forces, resulting in higher boiling points.

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Summary

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Intermolecular Forces: Dipole-Dipole and Hydrogen Bonding

  • Dipole-dipole interactions occur between polar molecules, such as acetone, where the partial positive and negative charges attract each other, creating a dipole-dipole interaction.
  • Carbon monoxide molecules exhibit dipole moments, leading to dipole-dipole interactions between separate molecules due to the attraction of oppositely charged ends.
  • Hydrogen bonding, a special type of dipole-dipole interaction, occurs when hydrogen is attached to nitrogen, oxygen, or fluorine, as seen in water molecules where hydrogen bonds keep them together.
  • Molecules with hydrogen bonding, like ammonia and methanol, have higher boiling points and increased water solubility due to the stronger intermolecular forces.
  • Comparing molecules like ethanol and dimethyl ether, the presence of hydrogen bonds leads to higher boiling points and solubility in water, with ethanol having a significantly higher boiling point and solubility due to its hydrogen bonds.
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