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Created page with "==Key Stage 4== ===Meaning=== Cracking is a Thermal Decomposition process in which large hydrocarbon molecules are broken into smaller hydrocarbon molecu..."
==Key Stage 4==
===Meaning===
[[Cracking]] is a [[Thermal Decomposition]] process in which large [[hydrocarbon]] [[molecule]]s are broken into smaller [[hydrocarbon]] [[molecule]]s.
===About Cracking===
: [[Cracking]] is often done because [[Crude Oil]] contains more large [[hydrocarbon]] [[molecule]]s than can be used and not enough short [[hydrocarbon]] [[molecule]]s than are needed.
: When [[Crude Oil]] fractions are '''cracked''' the long [[alkane]]s are broken down into smaller [[alkane]]s and [[alkene]]s.
: [[Cracking]] is done at very high [[temperature]]s (500°C) and uses either a [[catalyst]] to aid the [[Chemical Reaction|reaction]] or [[steam]].
: When an [[alkane]] is '''cracked''' into smaller pieces there are not enough [[Hydrogen]] [[atom]s to [[product|produce]] two [[Saturated Hydrocarbon|saturated hydrocarbon]]s. One of the [[hydrocarbon]]s must be [[Unsaturated Hydrocarbon|unsaturated]] and therefor will have a [[Double Bond|double bond]].
===Examples===
{| class="wikitable"
|-
|[[File:StructuralDiagramButane.png|center|200px]]
|[[File:ArrowRight.png|center|200px]]
|[[File:StructuralDiagramEthane.png|center|200px]]
|[[File:AdditionSign.png|center|200px]]
|[[File:StructuralDiagramEthene.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |Ethandioate and Ethandiol can [[Chemical Reaction|react]] together in a '''Condensation Polymerisation'''.
|
|colspan="3"| style="height:20px; width:200px; text-align:center;" |An [[alkane]] and an [[alkene]] are [[Product|produced]].
|}
===Meaning===
[[Cracking]] is a [[Thermal Decomposition]] process in which large [[hydrocarbon]] [[molecule]]s are broken into smaller [[hydrocarbon]] [[molecule]]s.
===About Cracking===
: [[Cracking]] is often done because [[Crude Oil]] contains more large [[hydrocarbon]] [[molecule]]s than can be used and not enough short [[hydrocarbon]] [[molecule]]s than are needed.
: When [[Crude Oil]] fractions are '''cracked''' the long [[alkane]]s are broken down into smaller [[alkane]]s and [[alkene]]s.
: [[Cracking]] is done at very high [[temperature]]s (500°C) and uses either a [[catalyst]] to aid the [[Chemical Reaction|reaction]] or [[steam]].
: When an [[alkane]] is '''cracked''' into smaller pieces there are not enough [[Hydrogen]] [[atom]s to [[product|produce]] two [[Saturated Hydrocarbon|saturated hydrocarbon]]s. One of the [[hydrocarbon]]s must be [[Unsaturated Hydrocarbon|unsaturated]] and therefor will have a [[Double Bond|double bond]].
===Examples===
{| class="wikitable"
|-
|[[File:StructuralDiagramButane.png|center|200px]]
|[[File:ArrowRight.png|center|200px]]
|[[File:StructuralDiagramEthane.png|center|200px]]
|[[File:AdditionSign.png|center|200px]]
|[[File:StructuralDiagramEthene.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |Ethandioate and Ethandiol can [[Chemical Reaction|react]] together in a '''Condensation Polymerisation'''.
|
|colspan="3"| style="height:20px; width:200px; text-align:center;" |An [[alkane]] and an [[alkene]] are [[Product|produced]].
|}