GCSE Chemistry - Addition Reactions of Alkenes #55

This video covers:
- The idea that the carbon-carbon double bond can break, which allows the carbons to bond to new atoms
- How alkenes react with hydrogen to form alkanes
- How alkenes react with water to form alcohols
- How alkenes react with halogens
- The bromine test
Exam board specific info:
AQA - Separate/triple science only
IGCSE Edexcel - Everything is relevant to your course!
Edexcel - Separate/triple science only
OCR 21st Century - Separate/triple science only
OCR Gateway - Separate/triple science only
Maths Playlist:
• GCSE Maths (9-1)
GCSE Chemistry playlist:
• GCSE Chemistry - Atoms...
GCSE Biology Playlist:
• Video
GCSE Physics Playlist:
• Video

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Thanks Sam! Amadeus and I spend a lot of time working how best to show stuff, so it’s really good to hear they’re useful 🙌

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this was literally the only thing that was able to actually teach me addition reactions

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Great to hear it helped! Good job your friend 🤝

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[@Cognitoedu]

If you’d like to practise what's covered in this video, check out the lesson on the Cognito platform - cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-t_7.09. The platform’s totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

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Is this aqa?

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[@allykim612]

you don't have a video lesson for the reaction of alkynes? btw, thank you so much for this.

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Glad it was helpful Aimen 👍

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[@Cognitoedu]

Glad you liked them Ahmet!

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good video

[@Strangeruser233]

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[@Cognitoedu]

Thanks Mariam we're glad it helped 🥳

[@emem5744]

Greetings! Do you have transcript of this video?

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Hi, i have GCSE in less than a month but i have never really learned the science syllabus i am trying to do it by watching. but everyone also says do past papers to get familiar with exam style questions. i really need some help or some advice on how to get a solid grade in combined science. thanks cognito

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[@zafarhashmi929]

How were bromine and ethene in liquid form?

[@nadakhalil6401]

Hi the contents of the video are wonderful and i used this video for my students in grade 9.But i have a note ,in our curriculum in Lebanon we have one more idea in addition reaction of Alkene which is the addition of hydrogenhalides its name is hydrohalogenation. So if you can make some changes in this video to add the last addition reaction (hydrohalogenation) then it will be perfect for my students.

[@shamsta21]

yes but that's not in the GCSE syllabus

[@xorose641]

this video is for GCSE chemistry and it wouldn't make sense to put that in there as we're not taught that at GCSE

[@sammh.8578]

For all those who don't know, hydrohalogenation IS in the IGCSE syllabus!

[@kenzahcarstairs9093]

@@sammh.8578 this is AQA GCSE not IGCSE

[@pomi6320]

You also forgot to talk about the reaction of addition of hydrogenhalide. which is adding a hydrogen halide to an alkene to form a haloalkene. for example: propene + hydrogen chloride ---> chloropropene. The hydrogen will bond to one carbon and chlorine to another one. we can change the chlorines location to make different izomers which are compounds having the same molecular formula but different structural formula. Like (1-chloropropene and 2-chloropropene). Also in some past paper questions for Chemistry IGCSE (0620) i found that they asked for the catalyst and conditions, so ill list them out. Hydrogenation Reaction Conditions: Catalyst: Nickel Temperature: 150 degrees C Hydration Reaction Conditions: Catalyst: Phosphoric Acid - H3PO4 Temperature: 300 degrees C Pressure: 60 A.T.M Other than that great video. Keep up the good work!!

[@sammh.8578]

Hey, you're right about the conditions, but isn't the bromine reaction also one of the hydrogen halide reaction?

[@pomi6320]

@@sammh.8578 A hydrogen halide is usually a halogen based acid. Such as HCl or HBr (not to be confused with HBrO3). Thus, its reactions would be different than those of normal halogens. One is a halogenation reaction and the other is a hydrogen halide reaction. Hope it helped!

[@riffatshahnaz5234]

This is aqa gcse not igcse

[@derrickz7120]

thx

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Good

[@AllesandraPanaligan]

Alkenes are a homologous series of hydrocarbons that contain only carbon and hydrogen atoms with double bonds. Is this correct?

[@ahmedshaeemmohamed1286]

i think its best to specify that they are carbon double bonds to spare any confusion

[@AllesandraPanaligan]

@@ahmedshaeemmohamed1286 thank you very much!

[@M2JS7]

Alkenes are unsaturated meaning they have a carbon to carbon double bond make sure u say that they are also more reactive than alkanes

[@janeb9986]

What are the products formed when Bromine Water reacts with 2-methylpropene ?

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Can u add the additional molecules anywhere?

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[@aam2157]

Please can you explain the alkynes?

[@M2JS7]

alkanes* and he has a video on it

[@riffatshahnaz5234]

​@@M2JS7it's alkynes

[@riffatshahnaz5234]

​@@M2JS7he don't have a vid on alkynes

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