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Published byBernard Miller Modified over 9 years ago
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Hydrogen Bonding SWBAT: Draw hydrogen bonds between two molecules
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Definition Hydrogen Bond A hydrogen bond is an electromagnetic attraction - not a true bond! Hydogen must be directly bonded to a small atom with high EN (N, O, F) Can form with another molecule (intermolecular) or another part of the same molecule (intramolecular). The hydrogen has a partial δ + charge and the oxygen has a partial δ - charge from being covalently bonded to an electronegative atom
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Symbol Covalent bond: solid line H-bond: dotted line
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Intermolecular H Bonding Hydrogen bonding between two molecules – from the attraction of the dipoles
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Intra molecular H-bonding DNA Hydrogen bonding within its own molecule – from the attraction of the dipoles
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Intra…..3D- Structure of Proteins
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Hydrogen Bonding
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Important H-bonds do not have to involve water molecules! All it needs is a δ + H which can come from any molecule: S H 2, C-O H, COO H, DNA, proteins…. And a δ - element as a neighbor (usually its O, S, N, P or the Halogen group)
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Beryllium Chloride (tri-hydride) BeCl 2 3H 2 O
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Organic molecules and H- bonds Draw dipole and partial charges of the following functional groups: don’t forget the unpaired Valence e- of Oxygen COH Alcohol CHO Aldehyde CO Ketone COOH Acid
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H-Bond Drawing guide Oppose each δ + and δ - with one H 2 O Show the δ + and δ - and net dipole of each water molecule Draw H-bonds as dotted lines Practice: CH 3 COH 3H2O CH 3 CH 2 COOH 4H2O CH2O 2H2O
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