This lesson was originally designed for the aqa gcse 91 chemistry specification but is easily transferable to other specifications including ks3 as a challenge lesson and ks5 as a recap. There is a much greater demand for shorter hydrocarbon than there is for the longer hydrocarbons. Learn about crude oil, hydrocarbons and alkanes with bitesize gcse chemistry aqa. Chemistry notes, unit 1 2 and 3, essential revision notes. Exams 290 watching live now covid19 coronavirus disease 19 causes, symptoms, diagnosis, treatment, pathology duration. 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 you may have to read through some of the page before you find the answer. What is the cracking of hydrocarbons after the fractional distillation of crude oil there are too many large hydrocarbons and not enough small hydrocarbons to meet the publics. This resource is a broken down practice exam question to help improve exam technique when answering exam questions on cracking.
Cracking edexcel igcse chemistry notes save my exams. Revision homework cracking hydrocarbons the production of some products of fractional distillation of crude oil, such as naphtha, fuel oil and bitumen, exceeds demand. Learn exam organic chemistry test hydrocarbons with free interactive flashcards. Written by teachers for the edexcel igcse chemistry course. The general formula for the homologous series of alkenes is cnh2n where n is the number of carbon atoms. Common igcse chemistry exam questions with answers june 1, 2019 october 26, 2019 tasvir mahmood 2 comments if you are looking make it a little bit easier for you in your igcse chemistry exams. Gcse science chemistry 91 crude oil and hydrocarbons duration. Targeted towards aqa c1 topic 5 but suitable for edexcel and other exam boards. Cracking is needed because when fractional distillation of crude oil occurs, you get a very high percentage of long chain hydrocarbons. The nobel school, stevenage, mobbsbury way, sg2 0hs phone. Really helpful and easy to use, would recommend to anyone about to sit their exams as a way of breaking up a day of samey revision. Choose from 500 different sets of exam organic chemistry test hydrocarbons flashcards on quizlet.
What is the scientific term used for the chemical reaction when a fuel. Designed by expert teachers for the edexcel gcse 91 chemistry syllabus. Youll also need time to complete assignments and prepare yourself for exams and some courses like english literature involve a lot of reading. Catalytic cracking takes place at a slight pressure, high temperature and in the presence of a zeolite catalyst and is used mainly to produce motor fuels and aromatic hydrocarbons mechanism not. Thermal decomposition a single substance is broken down by heating. One of the byproducts of this thermal decomposition reaction is ethene. Everyone is different so its impossible to say with certainty. Facts about cracking hydrocarbons present the information about a process of cracking employed in the chemistry and petroleum geology.
C 3 h 8 the following formula satisfies the general formula of alkane, and consists of 3 carbon atoms. Common igcse chemistry exam questions with answers igcse. These revision notes on cracking hydrocarbons like alkanes in the petrochemical industry and why the cracking reaction is so important should prove useful for the aqa gcse chemistry, edexcel gcse. We also look at alkenes and how we test for alkenes using bromine water. 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.
Organic chemistry now forms a substantial part of the gcse specifications. The fractional distillation of crude oil produces alkanes. Cracking takes place at high temperatures as the large molecules pass over a catalyst. Thermal cracking breaks cc bonds by homolytic fission forming free radicals. Gcse chemistry revision worksheets chemistry past papers. Since cracking converts larger hydrocarbons into smaller hydrocarbons, the supply of fuels is improved. This video prepares students for gcse higher tier science. Please remember to leave feedback, for updates and promotions you can also follow me here. Igcse chemistry past exams, tutorials, notes and more on nada ak is lecturing. For clarity hydrogens have been omitted from most structures on this test.
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. Fractions containing large hydrocarbon molecules are heated to vaporise them. What is the difference between alkanes and alkenes. Igcse chemistry past exams, tutorials, notes and more on nada ak is. Help prepare your students for highstakes standardized tests with this ela test prep listening skills escape room activity. Best igcse organic chemistry notes complete breakdown. Gcse chemistry revision questions fossil fuels crude. Free gcse chemistry science cracking hydrocarbons practice. The chemistry of cracking results in the formation of smaller, more useful alkanes such as petrol, and even more useful alkenes such as ethene. Regular practice will help you to understand the way the gcse chemistry papers are structured. Ethane, methane, octane and ethene are all examples of hydrocarbons. Gcse chemistry online course nec online distance learning.
Because alkenes are hydrocarbons with at least one carboncarbon double bond the alkene. Gcse chemistry what is the cracking of hydrocarbons. Whenever carbon does not appear to have the required number of bonds, it is understood. Cracking meaning types of cracking organic chemistry. The bad news is that organic chemistry is kind of a big topic. Crude oil was formed from the fossilized remains of dead plants and animals and therefore is called a fossil fuel. This is the first if six quizzes on that subject and it looks in particular at the hydrocarbons. Gcse practice papers are an essential tool for revision. Catalytic cracking processes heavy longchain fractions. Gcse chemistry science cracking hydrocarbons revision.
Cracking allows large hydrocarbon molecules to be broken down into smaller, more useful hydrocarbon molecules. This page contains the aqa gcse chemistry c9 hydrocarbons questions and kerboodle answers for revision and understanding hydrocarbons. This is a gross oversimplification, and is written to satisfy the needs of one. Press question mark to learn the rest of the keyboard shortcuts. During cracking, hydrocarbons are often passed over a substance so that they break apart. This resource is a broken down practice exam question to help improve exam technique when answering exam questions on cracking hydrocarbons. One of the topics studied in the chemistry section of gcse science is hydrocarbons.
The best way to remember the information in this chapter is to get a pen and paper and write down your answers. If the answer you have written is not right, change it. This page also contains the link to the notes and video for. Cracking oil fraction hydrocarbons to produce more useful products.
Long chain hydrocarbons can be broken into smaller hydrocarbons, by heating with a catalyst. Gcse chemistry revision organic chemistry crude oil. This lesson is designed for the new aqa trilogy chemistry gcse, particularly the organic chemistry sow. The purpose of this process is to get the simpler molecules from. Chemistry revision notes on the topic cracking hydrocarbons. Cracking fuels edexcel gcse chemistry single science. A good example of this is the cracking of hydrocarbons. You need to know about alkanes, alkenes, crude oil and the process of cracking. These are the compounds of carbon and hydrogen found primarily in crude oil and used to make fuels. Cracking and alkenes crude oil, hydrocarbons and alkanes aqa.
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 is described as a fossil fuel but it is much more important than that as many plastics have crude oil as a raw material. Catalytic cracking breaks cc bonds by heterolytic fission forming ions. Thermal cracking gives mixtures of products containing high proportions of hydrocarbons with double bonds alkenes. Gcse student, may 2014 the app is brilliant and it is helping me a lot with. Chemistry crude oil aqa one of the topics covered in gcse science is the chemistry of crude oil and other fuels. Cracking hydrocarbon chains will be expected for all three exam boards which are. Naming an organic compound by interprating the formula. After cracking the products are generally alkanes or unsaturated hydrocarbons called alkenes with the formula c n h 2n, examples are ethene and propene. Gcse fuel revision of hydrocarbon compounds in crude oil.
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