GCSE Chemistry - Condensation Polymers (Polyesters) #60

[@Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it'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

[@virajmokashi9303]

I believe there is an error on the condensation polymer at around 3 minutes there is a missing oxygen bond on the c in the final polymer

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It hasn't been o levels in 37 years

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I finally understand ..and it’s one day before my exam …

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Me too. Good luck tomorrow! Also, how did you find English Language Paper 2? Everyone has such different opinions on how it went...

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@@michaltam6694right so . 4 marker I think I over thought it but idk .question 2 was okay .question 3 was also fine .But question 4 I think I was stressed cause of the time so I didn’t write that much .And question 5, the statement could’ve been better, smth other than cars tbh . Also tell me why the train was bullying everyone 💀💀

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Great video to simplify a topic that seems difficult.

[@rowayda7535]

this helped me clear all my doubts on condensation polymerisation!! thank you so much for your hard effort. i was wondering if you also made a video on making polyamides, I'm still confused about that part. thank you!!

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thank you so much cognito you have really saved my grades , im more of a visual learner so by watching your videos it really helps me .By watching your videos and doing the interactive questions I have managed to pull myself from a grade 4 to a grade 8 , it couldn't have been done without these videos and the new website.Thank you very much. to all those that are reading this comment don't give up and remember slow and steady wins the race.🥰

[@Cognitoedu]

Thank you so much aqsa khan, that's really incredible and we're so glad we've been able to support your progress 😊

[@flyingmorningdew]

what a fantastic illustration of the polymerization process! much appreciated for the insights.

[@aliahmed-sj9ww]

thank you so much, that's the only video I saw and understand this process, thank you for ages❤❤❤❤❤❤❤💕😊

[@Cognitoedu]

Thanks ali, glad we could help 😊

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[@Cognitoedu]

Ah thank you so much Bilal, we wish you all the success 👍

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thank you soo much, I was so confused before watching the video but you made it so much easier to understand.

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igcse chem paper 4 in 2 hours and i finally understand this 😭

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[@Cognitoedu]

Happy to help!

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[@francaglover6923]

why does the acid not the alcohol give out the hydrogen

[@galefray]

I'm so curious why 2H₂O Molecules are produced per repeating unit...?

[@nic0264]

because theres a double condensation meaning 2 water molecules are produced, the first one when the first pair of OH (from the dicarboxylic acid) and H (from the diol) leave their structures and the second when the same thing happens with the pairs of the other end of each structure

[@abortive1581]

two water molecules are produced per repeating unit because each ester bond formation involves a hydroxyl group (-OH) from the acid and a hydrogen atom (H) from the alcohol. When these combine to form the ester linkage, a molecule of water (H₂O) is released. Since each repeating unit in the polymer chain involves two ester bonds (one from each end of the unit), a total of two water molecules are produced for every repeating unit added to the chain. This is why you see two water molecules released per repeating unit in the polymerization process.

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This is helpful.thanks

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Thank you so much

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simply extraordinary

[@bilalalthaf3927]

I finally understood this topic

[@he1ixs]

watching this on the morning of the gcse idk WHAT ill do if i fail

[@cosmicmaster1691]

how much did u get?

[@kushmalataj660]

I didn't two water molecules removal step

[@avnishchate3070]

why does the acid give up its hydroxide ion instead of the alcohol even though both of them have hydroxide ions?

[@mohamed-elfatih9933]

Good question

[@talamahmoud6219]

Because ethanol will change if it gives up its OH

[@abortive1581]

the acid and the alcohol both have hydroxyl groups (-OH), but the process works a bit differently. The acid usually donates its hydroxyl group because the reaction between the carboxyl group of the acid and the hydroxyl group of the alcohol forms a water molecule and a bond, creating the polymer chain. The alcohol’s hydroxyl group is involved in forming the ester linkage, but it’s the acid’s hydroxyl group that typically gets released as water in the process. This step helps drive the reaction forward, leading to the formation of the polymer.

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ooo this is very helpful,thank u very much.

[@Official_ukc_]

Thank you so much ❤

[@SilasHarveyRobothamMawdsley]

Thanks that was pretty cool

[@varishpersaud5093]

Nice video but why is another water molecule lost when drawing the repeating unit? Is one water molecule lost when the two monomers combine, then another when another ester joins?

[@Cognitoedu]

Hi, so tor from the repeating unit, one H2O is lost from the ester bond in the middle, but then another H2O is effectively lost from the 2 ends, in preparation for the formation of new ester bonds at either end. It's a bit weird because it's not really an equation for a single reaction, but a summary of all the condensation reactions. Hope that helps :)

[@varishpersaud5093]

@@Cognitoedu Oh that makes sense now, as the H from the diol and the OH from the carboxyl make up a second water molecule. Thank you!

[@Cognitoedu]

Exactly!

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Squeaky clean delivery

[@fiso64]

Hey, thanks for the great explanation. Though I don't understand why those 2 prerequisites you mentioned are required for a polycondensation reaction, and I can't even find any info on that elsewhere.

[@athegameroffical]

Have you done the video of additional polymers?

[@Cognitoedu]

We have! It should come up if you search ‘addition polymers cognito’

[@athegameroffical]

Ok thanks

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merci beaucoup monsier♥️

[@achouxo]

THANK YOU SOOOO MUCH

[@mochitaetae7616]

Can u pls tell me whether all condensation polymers are copolymer??

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1 and a half hours to go 😭

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PLEASE HELP - how do you know/work out what the product is?

[@maximusekon146]

the product is a polyester

[@cosmicmaster1691]

and water @@maximusekon146

[@CloveAbuser]

i just realized the diol one is (OH-) not (OH-C-C-) as stated in the video

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Polyester are biodegradable? Some studies show that they are not. (Could you clear that for me)

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Some are biodegradable these are known as biopolyesters

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