2.2 Intermediate Bonding and Bond Polarity

Laura Perry
Mind Map by Laura Perry, updated more than 1 year ago
Laura Perry
Created by Laura Perry almost 5 years ago
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A Levels Chemistry Mind Map on 2.2 Intermediate Bonding and Bond Polarity, created by Laura Perry on 04/02/2015.

Resource summary

2.2 Intermediate Bonding and Bond Polarity
1 Electronegativity
1.1 The measure of attraction of an atom in a molecule for a pair of electrons in a covalent bond
1.2 The Pauling Scale- electronegativity increases across a period and down a group, making flourine the most electronegative element
2 Ionic and Covalent bonding
2.1 They are the extremes of a continuum of bonding type
2.2 To find what degree a bond in a molecule is covalent or ionic, find the difference in electronegativity then use a table to find the result
2.3 Less electronegative is covalent, more elctronegative is ionic
3 Polar bonds
3.1 The more electronegative element atom attracts the electron pair more so it will have a delta negative charge whilst the other atom has a lesser share of the elctron pair so has a delta positive charge.
3.2 A covalent bond in which there is a separation of charge (one end delta negative and the other delta positive)
3.3 Can only form between two different molecules as two of the same molecules have the same amount of electronegativity so the electron charge is in the middle
3.4 The more electronegative a molecule, the more the elctron pair will move towards it, making it more ionic than covalent
4 Polar molecules
4.1 Just because a molecule has polar bonds, it doesn't mean that it a polar molecule
4.2 Lacks symmetry, is linear, has a single H atom, has an OH at one end, has an end at one end.
4.3 Uneven distribution of charge- if negative is on the outside and positive on the inside then the molecule will not be polar
5 Non-polar molecule
5.1 Symmetrical, an element or a carbon compound
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