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Alkanes

What bonding is present in alkanes and what types of reactions do they undergo in relation to their bonding ?


Could do with some help with this please :smile: ?
Reply 1
Avatar for niaphonic
niaphonic
10
Firstly think about the difference between alkanes and alkenes - what is is about the bonds between the carbon atoms that makes these two molecules different? e.g. ethane and ethene

As for reactions, polyethene (also known as polyethylene) is an example of a kind of reaction that an alkene (ethene) can undergo due to the kind of bonding present within the molecule, but the alkane (ethane) cannot do this.
(edited 10 years ago)
Reply 2
Avatar for Dualcore
Dualcore
Original post by KKP109
What bonding is present in alkanes and what types of reactions do they undergo in relation to their bonding ?


Could do with some help with this please :smile: ?


Covalent bonding, they don't really react with much you can burn them in oxygen to form CO2 and H2O. They can also react with halogen radicals to form halogenoalkanes.
Original post by KKP109
What bonding is present in alkanes and what types of reactions do they undergo in relation to their bonding ?


Could do with some help with this please :smile: ?


By 'in alkanes', do you mean within each molecule or between molecules? In both cases, think of which atoms are present in alkanes and what the combinations of the atoms in bonds are.
Reply 4
Avatar for roundbobby
roundbobby
As far as to what an alkane is, the general formula is CnH(2n+2). They are saturated hydrocarbons and so only contain C, H and single bonds. As the C-H bond has negligible polarity, alkanes are regarded as non polar molecules.

THEREFORE the only intermolecular forces between alkanes are London forces/Van der Waal'a forces (same thing).

The CH bond is pretty stable, so the only thing that can cause the alkanes to react is free radical substitution (the one with initiation, propagation and termination). This is of course along with reformation reactions (Alkane-> Alkane and Alkane) or (Alkane -> Alkane +Hydrogen). You can also combust alkanes

I think that's pretty much it, although you have to lean it all in more detail, this is just a summary of this section


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Reply 5
Avatar for roundbobby
roundbobby
And this is for the Edexcel exam board, it might be different stuff for othera


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