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What is a hydrogen bond site? and for hydrogen bonding to occur do both compounds need to contain a hydrogen bonded to F O or N or can you have one compound that involves a bond between H and F O or N and the other compound to just be an F O or N not bonded to a H. For example is the bond between H3N and CO2 considered an H bond?
A hydrogen bonding site is where there are any lone electron pairs that can experience electrostatic interactions with an atom from another molecule. This is why the O atom in water can form 2 hydrogen bonds with two other hydrogen atoms. For hydrogen bonding to occur, there only needs to be a F, O, or N atom bonded to an atom with a small electronegativity and an H atom bonded to a F, O, or N atom. The F, O, or N atom can be bounded to atoms with small electronegativities like Carbon and still undergo hydrogen bonding. There just has to be partial positive and partial negative charges. Lastly, I believe hydrogen bonding can occur between NH3 and CO2, though there is some variability as to the accepted definition of hydrogen bonding.
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