When can hydrogen bonds be formed (ZMK-30) Explain what hydrogen bonds are.

  Exercise: ZMK-30    

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Explain what hydrogen bonds are.

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Solution:

To form H-bridges, different ingredients are needed: an atom that …

1. It's bound to one of the atoms F, O or N covalently, so specifically, some combination with F-H, O-H or N-H.
2. On the opposite side (i.e. opposite to hydrogen via F-H, O-H or N-H) a free electron pair (again part of an F, N or O atom)
3. To good the last must the rural areas approximation of provisions [translation unavailable] be; z.B.: -O-H · · · | .

Note that the H-bridge is not indicated as the covalent bond with one line but with (about) three points.
As a rule of thumb, the word 'FöHN' may be used. Example of a hydrogen bond between two water molecules:

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