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Topic 1
Member rating: No Rating | Words: | Submitted: Tue Oct 17 2006
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Topic 1.3: Structure and bonding Learny bits: - 1. Chemical bonds: - 1. Ionic - between separate ions 2. Covalent: divided into 2 types o polar covalent where the bonding pair of electrons is nearer to one atom o Pure covalent where the bonding pair of electrons is shared equally o Metallic- bonding caused by electrons delocalised throughout the solid 2. Intermolecular forces (BETWEEN covalent molecules) o Hydrogen bonds: Between ?+ H in one molecule and ?- F,O or N in another molecule o Dispersion forces: between all molecules. Their strength depends upon the number of electrons in the molecule. o Dipole/dipole forces (aka Van Der Waals): between ?+ in one molecule and ?- in another molecule. Definitions (:(! More...): - o An Ionic bond is the electrostatic attraction that occurs between an atom that has lost one or several electrons- the cation- and one that has gained one or several electrons- the anion. o A covalent bond occurs when 2 atoms share...
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