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Cracking hydrocarbons:
Many of the fractions we get from fractional distillation aren't very useful. They contain hydrocarbons
molecules that are too long to use for fuel because they are too thick liquids and don't burn easily.
Therefore we have to use a process called cracking. The best way uses a…

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They form cross links when heated so they can't be remelted only burnt.
Therefore they are hard to recycle them because they can't be melted down and reshaped.
Thermoplastics:
They do not form cross links when heated so can be remelted.
Therefore can be recycled.

New + useful polymers:
Smart…

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