13.1 Properties Of Alkenes
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What type of hydrocarbons are alkenes?
Unsaturated hydrocarbons
Why are alkenes unsaturated?
They contain at least one Carbon Carbon double bond
General formula for alkenes
CnH2n
What is a pi bond?
A pi bond is caused by the sideways overlap of 2 p orbitals Electron density is concentrated above and below the line joining the two nuclei of the bonding atoms
Why can the Carbon atoms not rotate around each other in a pi bond?
The pi bond locks the two Carbon atoms in position
The shape around a double bond
3 regions of electron density around each Carbon atom 3 regions repel each other as much as possible Trigonal planar shape, 120 bond angle All atoms are in the same plane
How many bonds can a carbon atom form?
4
Outline the 4 bonds that a Carbon atom forms
3 sigma bonds (head on overlap of orbitals) 1 pi bond (sideways overlap of orbitals)