Anonymous
Anonymous asked in Science & MathematicsChemistry · 1 decade ago

what is hydrogen bonds?the causes of hydrogen bonds?water and hydrogen bonds?

distingiush hydrogen bonds and full about hydrogen bonds?

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  • 1 decade ago
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    Hydrogen bonding is the INTERMOLECULAR force which is found BETWEEN molecules, not within molecules.

    In order to have hydrogen bonding there must be a compound in which hydrogen is covalently bonded to nitrogen, oxygen or fluorine to form a polar molecule. These polar molecules then experience a strong attractive force through the hydrogen, which is slightly positive, for the slightly negatively charged nitrogen, oxygen or fluorine of an adjacent molecule.

    Water is an example of a polar molecule exhibiting hydrogen bonding. Because of the stronge hydrogen bonds, water has much higher melting and boiling points than would otherwise be expected simply on the basis of dipole-dipole attraction and London dispersion forces.

    ========= Follow up =========

    Careful, Bhoomi says, "...hydrogen bond is an attractive force between two hydrogen atoms which are attached to an electronegative atom of same or different molecule."

    That is not the case. The hydrogen atom of one molecule is NOT attracted to a hydrogen atom of an adjacent molecule. That's because each hydrogen in a molecule in which there is hydrogen bonding has a partial positive charge. If that is the case then they will repel each other, not attract. It's the hydrogen of one molecule attracting the N, O or F or an adjacent molecule that constitutes the hydrogen bond.

  • Anonymous
    1 decade ago

    Hi,

    hydrogen bond is an attractive force between two hydrogen atoms which are attached to an electronegative atom of same or different molecule...

    Causes:Even though this bond is a weak bond,without this bond there is no life.This is because some energy is required to break the bond,to convert ice into water and water into gas.Therefore water remains as a liquid at room temparature.

    Source(s): Inorganic chemistry book and http://cdavies.wordpress.com/2006/06/29/water-chem...
  • 1 decade ago

    Hydrogen bonds are weak interactions between atoms which have H attached to a highly electronegative atom such as Oxygen. basicly since there is only one electron and it's likely to be around the O (or N etc) the one proton is left exposed (a fairly strong + end of the molecule is created) this is attracted to the negative end of another molecule. In the case of water H-bonding is responsible for it's properties of high boiling point, surface tension, expansion when freezing, etc.

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