This page describes what cracking is, and the differences between catalytic cracking and thermal cracking used in the petrochemical industry. Cracking. A secondary school revision resource for AQA GCSE Chemistry about the useful substances extracted from oil mixtures in the cracking process. GCSE CHEMISTRY - What is the Chemistry of the Cracking of Hydrocarbons? - Conditions - Catalyst - Thermal Decomposition - GCSE SCIENCE. Cracking Decane Gcse ResultsGCSE CHEMISTRY PRODUCTS FROM OIL. Crude oil is a mixture of many different hydrocarbons. Cracking decane can sometimes produce just two types of molecule. Cracking Decane Gcse RevisionGCSE. GCSE resources with. Alkanes, Cracking and Alkenes Alkanes Saturated Hydrocarbon. Octane - C8H18 9) Nanane - C9H20 10) Decane - C10H22 Physical Properties. gcsescience.com 33 gcsescience.com What is the Chemistry of the Cracking of Hydrocarbons? Cracking of hydrocarbons involves thermal decomposition. This means that large hydrocarbon molecules break into smaller molecules when they are heated. The hydrocarbons are boiled and the hydrocarbon gases are either mixed with steam and heated to a very high temperature or passed over a hot powdered aluminium oxide catalyst. The catalyst works by providing the hydrocarbon gases with a convenient surface for the cracking to take place. For example, decane (an alkane with 10 carbons) can be cracked to produce octane and ethene. decane octane + ethene. C10H22(g) C8H18(g) + C2H4(g) Octane is used as petrol. Ethene is used in the manufacture of polymers . Cracking an alkane produces a smaller alkane plus an alkene. If you add up the number of hydrogen atoms in the above reaction, you will see that there are 22 on each side. An alkene is produced because the original alkane does not have enough hydrogen atoms to produce two more alkanes. Links Hydrocarbons Revision Questions gcsescience.com The Periodic Table Index Hydrocarbons Quiz gcsescience.com Home GCSE Chemistry GCSE Physics Copyright © 2015 gcsescience.com. All Rights Reserved. The Chemistry of the Cracking of Hydrocarbons including the Conditions and Catalyst - Thermal Decomposition.
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Март 2019
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