Comparing Boiling Points of Molecules

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In this video we’ll identify the intermolecular forces for NH3 (Ammonia). Using a flowchart to guide us, we find that NH3 is a polar molecule. It also has the Hydrogen atoms bonded to a Nitrogen atom. Therefore NH3 the main intermolecular force is Hydrogen Bonding (note that NH3 also has Dipole-Dipole and London Dispersion Forces). • In determining the intermolecular forces present for NH3 we follow these steps: • Determine if there are ions present. Since NH3 is a molecule and there is no + or – sign after the Ammonia can say that it is not an ion. • Next, based on its Lewis Structure, we determine if NH3 is polar or non-polar (see • Is NH3 Polar or Nonpolar? (Ammonia) ). Since there is large difference in electronegativity between the atom H and N atoms, and the molecule is asymmetrical, Ammonia is considered to be a polar molecule. • Since we have a large difference in electronegativity and the H is bonded to a N atom the main intermolecular force is Hydrogen Bonding. • Useful Resources: • Determining Polarity: • Polar, Non-Polar, and Ionic Compounds... • Drawing Lewis Structure: • How to Draw Lewis Structures: Five Ea... • Molecular Geometry: • Molecular Geometry: Rules, Examples, ... • Molecular Visualization Software: https://molview.org/ • More chemistry help at http://www.Breslyn.org

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