hydrogen bonding

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9 Terms

1
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Hydrogen bonding is…

electrostatic attraction between a very electron deficient atom and a lone pair

2
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Hydrogen bonds form in molecules with very…

polarised bonds and lone pairs

3
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N<O<F e.g contains either…

N, O, F bonded to H

4
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Attraction between H+ and lone pair on X forms a…

hydrogen bond

5
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Properties of hydrogen bonds:
melting/boiling point:
reason:

higher melting and boiling point, strong h-h bond needs more energy to break

6
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Properties of hydrogen bonds:
ice's behaviour:
reason:

ice floats on water, long h bonds hold water molecules apart in lattice structure, larger volume than liquid water

7
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Properties of hydrogen bonds:
surface tension/viscosity:
reason:

high surface tension and viscosity, strong h bond needs to be broken

8
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Top of groups are…

more electronegative

9
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H2O has hydrogen bonding, so its…

stronger, needs more energy to overcome