Lecture 24 - Lengths of Covalent Bonds Bond Type Bond...

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Bond Type Bond Length (pm) C - C 154 C = C 133 C C 120 C - N 143 C = N 138 C N 116 Lengths of Covalent Bonds Bond Lengths Triple bond < Double Bond < Single Bond 9.4
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H F F H Polar covalent bond or polar bond is a covalent bond with greater electron density around one of the two atoms electron rich region electron poor region e - rich e - poor d + d - 9.5
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Covalent share e - Polar Covalent partial transfer of e - Ionic transfer e - Increasing difference in electronegativity Classification of bonds by difference in electronegativity Difference Bond Type 0 Covalent 2 Ionic 0 < and <2 Polar Covalent 9.5
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Classify the following bonds as ionic, polar covalent, or covalent: The bond in CsCl; the bond in H 2 S; and the NN bond in H 2 NNH 2 . Cs – 0.7 Cl – 3.0 3.0 – 0.7 = 2.3 Ionic H – 2.1 S – 2.5 2.5 – 2.1 = 0.4 Polar Covalent N – 3.0 N – 3.0 3.0 – 3.0 = 0 Covalent 9.5
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atoms are bonded to each other. Put least electronegative element in the center. H is never in the center and never forms more than 1 bond. 1. Count total number of valence e - . Add 1 for each negative charge. Subtract 1 for each positive charge. 1. Complete an octet for all atoms except hydrogen 1. If structure contains too many electrons, form double and triple bonds on central atom as needed. Writing Lewis Structures – Cmpds. Obeying Octet
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Lecture 24 - Lengths of Covalent Bonds Bond Type Bond...

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