Designed by expert teachers for the edexcel gcse 91 chemistry syllabus. Mfl department at clough hall school gcse religious studies by revision buddies is a decent app for those of you wanting to cram in a few moments of worthwhile but succinct revision before the big day. Some of the large hydrocarbons the heavier fractions are broken down into more useful smaller hydrocarbons lighter fractions by a process known as cracking. Gcse chemistry revision science section covering cracking and its products, hydrocarbons, catalyst, thermal decomposition, alkanes, single and double. Cracking is an example of a thermal decomposition chemical reaction. Cracking and alkenes crude oil, hydrocarbons and alkanes.
Gcse chemistry revision guides and question banks covering periodoc table, acids and alkalis, rates of reaction and all core gcse chemistry topics. Browns gcseigcseo level ks4 sciencechemistry revision notes. Hydrocarbons from oil a2levellevelrevision, chemistry. Index of pages on oil, its many useful products, environmental problems and an introduction to organic chemistry doc browns revision notes for gcse, igcse, o level, ks4 sciencechemistry courses the organic chemistry of carbon compounds is so important that it forms a separate branch of chemistry. Gcse crude oil revise the thermal cracking reaction. To do well in gcse science, year 10 and year 11 students will need to know what hydrocarbons and alkenes are. Learn the basics about the cracking of hydrocarbons and why it is done. The bad news is that organic chemistry is kind of a big topic. This video prepares students for gcse higher tier science. The best way to remember the information in this chapter is to get a pen and paper and write down your answers before clicking on the answer link which will take you to the correct page. Two methods of cracking how to write a balanced equation for cracking what an alkene is, and how they differ from an alkane the test for alkenes the. Do larger hydrocarbons have a higher or lower boiling point than smaller hydrocarbons. Displacement when one more reactive element pushes another less reactive element out of a compound.
It is caused by the breaking of carboncarbon bonds. Cracking cracking is the breaking down of an unsaturated hydrocarbon into smaller hydrocarbons. Petrol and other fuels are produced from it using fractional distillation. Give a description of how crude oil is formed and where it is found. So were going to split it up into the main topics you need to learn for gcse, namely alkanes, alkenes and and the cracking of crude oil. Gcse chemistry what is the cracking of hydrocarbons. Give two examples of properties of hydrocarbons that are dependent upon the size of the hydrocarbon molecule. Revise what you learned in year 10 and year 11 in this exciting quiz. This lesson is designed for the new aqa trilogy chemistry gcse, particularly the organic chemistry sow.
What is the name of the process by which large hydrocarbons are broken up into smaller, more useful molecules. Theyre found in crude oil and have many uses, from fuel to construction materials. In this video, we look at how cracking is used to convert longchain hydrocarbons into shorterchain. Gcse chemistry revision scool, the revision website. We can break down hydrocarbons in a process called cracking. Cracking hydrocarbons edexcel gcse chemistry revision notes. Written by teachers for the edexcel igcse chemistry course. For the best revision experience, use both the notes and the videos at the same time to help you follow along. Gcse c1a alkane alkene revision flashcards quizlet. A good example of this is the cracking of hydrocarbons. Oil, useful products, environmental problems, introduction to organic chemistry.
So lets get cracking get it with alkenes and crude oil. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Cracking edexcel gcse chemistry single science revision. We crack alkanes because the shorter chain alkanes are more valuable they are used as fuel. Cracking meaning types of cracking organic chemistry. In the ball and stick models below, carbon atoms are black and hydrogen atoms are white. High octane starter to inject pace which is easily adapted for other lessons. This page also contains the link to the notes and video for the revision of this topic. Alkanes crude oil, hydrocarbons and alkanes aqa gcse. The purpose of cracking is to produce high demand hydrocarbons. Cracking oil and alkenes gcse triple award revision. All resources are updated for the latest aqa 91 chemistry specification. The general formula for the homologous series of alkenes is cnh2n.
It is the remains of plantsanimalsfossils produced over millions of years. You will find a general guide which has been produced to help you revise for all your subjects and then there are some specific materials which have been produced to help you with your science gcse revision. You tend to get molecules containing benzene rings and short hydrocarbons. Doc browns gcseigcseo level ks4 sciencechemistry revision notes. Thermal cracking gives mixtures of products containing high proportions of. Mr ridgway, king edward vi camp hill school for girls i am loving the design and how easy the app is to use. Fuels made from oil mixtures containing large hydrocarbon. The rate of catalyst greatly depends upon the factors such as the presence of catalyst and temperature. Alkenes are unsaturated which means they contain a carboncarbon double bond. Have a go at this interactive aqa syllabus a quiz and revise what youve learned about their chemistry. Thermal decomposition a single substance is broken down by heating.
I saw an example of cracking hexane and decane and one of the products of both was always ethene. Cracking hydrocarbon chains will be expected for all three exam boards which are aqa. Bromine water can be used to test for the presence of unsaturated molecules. Cracking oil fractions reaction conditions products equations. Catalytic cracking and balance equation gcse science balancing equations.
The alkenes are a series of hydrocarbon molecules made of carbon and hydrogen. Crude oil and hydrocarbons crude oil, hydrocarbons and. A feedstock is a raw material used to provide reactants for an industrial reaction. Basic gc i know hydrocarbons contain only carbon and hydrogen. This page contains the aqa gcse chemistry c9 hydrocarbons questions and kerboodle answers for revision and understanding hydrocarbons. Balanced equation for cracking of heptane deviltopp. Firstly, students asked to think about a question that oil companies face what to do with longer chain hydrocarbons which are in less demand than smaller chain hydrcarbons. Gcse chemistry unit 1 cracking alkanes to make alkenes cracking alkanes to make alkenes. After the fractional distillation of crude oil there are too many large hydrocarbons and not enough small hydrocarbons to meet the publics demand. Cracking is defined as a process, wherein complex organic molecules namely long chain hydrocarbons or kerogens are broken down into smaller molecules namely light hydrocarbons. Cracking is used to convert long alkanes into shorter, more useful hydrocarbons. The products of cracking include shorter alkanes and unsaturated hydrocarbons called alkenes. Gcse chemistry revision covering cracking and its products, hydrocarbons, catalyst, thermal decomposition, alkanes, single covalent bonds, alkenes, double covalent bonds, and cracking paraffin.
Revision for aqa chemistry gcse, including summary notes, exam questions by topic and videos for each module. Cracking is the process of converting alkanes into alkenes and shorter alkanes. There is a greater demand for smaller hydrocarbons than larger ones. The carbon atoms in these molecules are joined together in chains and rings. Industrial processes such as cracking and reforming use these fractions to make hydrocarbons, which are in short supply. This page contains the detailed and easy notes for aqa gcse chemistry organic chemistry for revision and understanding organic chemistry. Cracking heat hydrocarbons and vapourise them then pass these vapours over a catalyst.
I print the starter as as handout sheet so they only have to complete the cloze exercise without writing everything. Below you will find our collection of revision notes and video tutorials. Cracking and alkenes gcse chemistry single science revision. Gcse aqa revision combined science gcse aqa revision combined science gcse aqa revision combined science gcse aqa revision combined. Alkenes unsaturated hydrocarbons their chemical reactions. Learn about crude oil, hydrocarbons and alkanes with bitesize gcse chemistry aqa. Chemistry revision notes on the topic cracking hydrocarbons. Hydrocarbons and crude oil gcse chemistry combined.
Cracking gcse chemistry single science revision wjec bbc. Cracking is normally carried out at high temperatures using a catalyst. As part of their work on crude oil, gcse chemistry students will look at thermal cracking. Index of oil and organic chemistry gcseigcseo level. This is a chemical reaction in which heat breaks down long chain molecules into smaller ones. New91 aqa gcse chemistry c9 hydrocarbons kerboodle. Conformations are the different arrangement of atoms that can be converted into one another by rotation. Complete the sentences using the words in the boxes. In this part of the website you can find a range of materials designed to support you through your gcse science revision. What conditions are needed for cracking of large hydrocarbons. Cracking oil fraction hydrocarbons to produce more useful products. Gcse chemistry revision science section covering cracking and its products, hydrocarbons, catalyst, thermal decomposition, alkanes, single and double covalent bonds, and cracking paraffin.