Cracking
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Contents
Key Stage 4
Meaning
Cracking is a Thermal Decomposition process in which large hydrocarbon molecules are broken into smaller hydrocarbon molecules.
About Cracking
- Cracking is often done because Crude Oil contains more large hydrocarbon molecules than can be used and not enough short hydrocarbon molecules than are needed.
- When Crude Oil fractions are cracked the long alkanes are broken down into smaller alkanes and alkenes.
- Cracking is done at very high temperatures (500°C) and uses either a catalyst to aid the reaction or steam.
- When an alkane is cracked into smaller pieces there are not enough Hydrogen [[atom]s to produce two saturated hydrocarbons. One of the hydrocarbons must be unsaturated and therefor will have a double bond.
Examples
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| Ethandioate and Ethandiol can react together in a Condensation Polymerisation. | style="height:20px; width:200px; text-align:center;" |An alkane and an alkene are produced. | |||
