Anonymous
Anonymous asked in Science & MathematicsChemistry · 3 months ago

Which of the following are required for hydrogen bonding to occur?

Two polar molecules

A hydrogen molecule with a partial positive charge

An oxygen molecule with a partial negative charge

All of the above

A and B

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  • 3 months ago
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    None of the above ....

    Only A is true of all hydrogen bonds but it can be true of bonds which are not hydrogen bonds. It is important to understand that hydrogen bonding is not some kind of dipole-dipole attraction. Hydrogen bonding involves the formation weak covalent bonds with orbital overlap. The hydrogen forms a bridge between two molecules.

    Molecules need not be polar to exhibit hydrogen bonding. There only needs to be H in one molecule bonded to N, O or F, and a weak covalent bond between the H and O, F or N in an adjacent molecule.

    For instance, a hydrogen bond exists between water and CO2, which is nonpolar.

    ...O − H•••O = C = O

    ../

    H

    Water is the hydrogen bond donor and CO2 is the hydrogen bond acceptor.

    As for H exhibiting a partial positive charge, that is true of hydrogen bonds and as well as for compounds which do not exhibit hydrogen bonding. For instance, in HCl hydrogen has a partial positive charge, but there is no hydrogen bonding in HCl.

    This is a very poor question about hydrogen bonding.

    • pisgahchemist
      Lv 7
      3 months agoReport

      Then the answer is wrong, and whoever wrote the question needs to study hydrogen bonding some more.

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