Can anyone help me with this question I have tried everything. I know hydrogen bonding is with $\ce{F}$, $\ce{O}$, or $\ce{N}$, but every time I select those is says it's wrong.
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$\begingroup$ Which part of the question are you getting wrong? Top, bottom, or both? I'm guessing that if it's the bottom, then you need to include H in your list of H-bonding atoms to choose from. $\endgroup$– jerepierreCommented Sep 22, 2014 at 23:06
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1 Answer
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The positive end of water can hydrogen bond with N, O, or F, as you said, but only if A) the geometry of the atom allows the water and N/O/F to get close to one another and B) the N/O/F has a lone pair of electrons. This happens at each of the green circled nitrogen and oxygen atoms. The red circled nitrogen is a decoy, as it is neither geometrically available nor does it have the appropriate configuration of electrons.
The negative end of water can hydrogen bond with hydrogen atoms that are attached to the N/O/F atoms, including the ones that are attached to the N atom that was not correct for the first part.
