Hello! I find your videos very useful! I noticed you mentioned amides in your video and I was wondering, do you had a video on those? It's in my Edexcel specification. Thank you very much again :)
+fatima khan If the polymer contains C=ONH link then it would be formed by condensation between amine and carboxylic acid. Similarly if you see COO-R (ester group) then this is also condensation. If it is just an alkane then this would have been formed from an alkene monomer so will have been addition. Hope this helps!
isn't the water amount (2n-1)? one water eliminated for each (n) of diol and (n) dicarboxylic acid and then one additional water per each additional member of polymer? it's in ocr chemistry a2 book by dave gent and rob ritchie, cheers
maxAmain Yes however in the video I have shown a section of the polymer chain where 2 water molecules have been lost. One where the ester link is and one from the 2 ends of the repeat unit. The example that the OCR book will show is just the joining of 2 molecules to show the ester link. In this case it will be 2n-1 and hence only give 1 water molecule. Be cautious with the question that they may ask this in the exam to make sure the right amount of water is given. From what you have told me it seems OCR may be more inclined to ask about 2 monomer units joining only hence the 2n-1. Hope this helps!
Thank you for making chemistry so much clearer, I can't thank you enough :)
Hello! I find your videos very useful! I noticed you mentioned amides in your video and I was wondering, do you had a video on those? It's in my Edexcel specification. Thank you very much again :)
Not as such as amides pop up in various topics. Thanks for watching the vids though! Please share them.
How do we tell by just looking at the polymer which sort of reaction occurred for it to be formed; addition or condensation?
+fatima khan If the polymer contains C=ONH link then it would be formed by condensation between amine and carboxylic acid. Similarly if you see COO-R (ester group) then this is also condensation. If it is just an alkane then this would have been formed from an alkene monomer so will have been addition. Hope this helps!
Do we need to memorise all these specific example for AQA?
isn't the water amount (2n-1)? one water eliminated for each (n) of diol and (n) dicarboxylic acid and then one additional water per each additional member of polymer? it's in ocr chemistry a2 book by dave gent and rob ritchie, cheers
maxAmain Yes however in the video I have shown a section of the polymer chain where 2 water molecules have been lost. One where the ester link is and one from the 2 ends of the repeat unit. The example that the OCR book will show is just the joining of 2 molecules to show the ester link. In this case it will be 2n-1 and hence only give 1 water molecule. Be cautious with the question that they may ask this in the exam to make sure the right amount of water is given. From what you have told me it seems OCR may be more inclined to ask about 2 monomer units joining only hence the 2n-1. Hope this helps!
thank you very much
Cheers! Please share this channel with your friends. The more people that use it the better! 😀
Nice video
Can you make a polyamide with amino acids ?
thanks alot
And how do "we" join them?What are the conditions?
High pressure and high temperatures