(19th of 19 Chapters) Organic Chemistry part 3 of 3 - GCE O Level Chemistry Lecture

[@sunshine8512]

its high time to appreciate ur skills and teaching ur videos were only resources i had for my syllabus no and with that only i became able to score A* .. and now i would request u to continue this great work for As and A level PLZ JUST give it a start daily a video would definitely cover the syllabus with in few months. thanks for A*

[@ChemLectures]

thanks. rather busy now, would like to do so in the very near future

[@sunshine8512]

not for examination of may 2017

[@umaireasyhojao]

Sir you missed the natural polymers fats carbohydrates and amino acids since they are in the latest syllabus of caie chemistry 5070 ( 2017,2018&2019) .plz do a video on them aswell plz sir❤

[@marieopheliecollet5144]

I'm taking my o levels in a month and these videos have been so helpful. I didn't understand the whole Organic Chemistry chapter in class but now it's so much clearer in my head. Thank you so much sir. :)

[@ChemLectures]

Great that it helped!

[@Thebluedaffodils]

I must say that these videos are just wonderful and awesome . I could understand everything Crystal clear!! Thankyou so much for these videos and Making chemistry much easier for us! Thanks alot again. :)

[@ChemLectures]

+izma masood welcome :-)

[@auditirahman3857]

hello sir, just here to let u know how grateful i am to u.🖤 thanks to u, i passed my o'level chemistry with an A* at 98%. I could never actually afford a chem teacher or coaching, so it was just u and ur lecture videos that helped me throughout my journey. You are a lifesaver. Words are not enough to show my gratitude, thank u so so so so so so so much❤️❤️❤️❤️❤️

[@ChemLectures]

Well done! Do share this resource with your friends

[@yousufahmed7514]

Hey there great teacher. What you have done its not possible for everyone to do so. Your lectures helped me alot in my exams and i really want to learn A levels chemistry from you as well. Hail to you great noble person.

[@ChemLectures]

Thanks

[@zahra-gs9lu]

Dear sir, I have my chemistry CIE tomorrow and I owe you a huge thanks for helping me understand Chemistry so much better. As I had said before, you are a very blessed teacher and I am grateful to have come across you.

[@ChemLectures]

thank you!

[@GearInfinite]

Thanks for vids ! Really helpful in preparing me for the upcoming O levels

[@alangrace1348]

Finally finished your chem series - thank you for making all this knowledge available - it's helped a lot :)!

[@ChemLectures]

glad you found it useful

[@armunalam]

Finally I'm clear with condensation polymerization! This video (along with all the other videos in the entire Chemistry playlist) is actually so coherent! :D

[@ChemLectures]

+Armun Alam thanks

[@armunalam]

+Chem Lectures (Chua Tung Kian) You're welcome! :)

[@rashidtarar6210]

Thanks 😊 very much sir. Its really helpful

[@ChemLectures]

Most welcome

[@tashfeenzaman9929]

And Yes for Chemistry Practical

[@zahra-gs9lu]

doing last chapter today, thank you so much sir!

[@ChemLectures]

great!

[@usmanvids]

God bless you man, you are just awesome, a great help.

[@ChemLectures]

+usman golo thanks

[@umarrauf13]

Hello sir,I really feel very proud to tell you that i have been your youtube student and i recieved an A* in igcse in chemistry all because of you😊😊thanks once again sir

[@ChemLectures]

Brilliant! Well done!

[@itachisasu387]

Got a advice for me,my paper is in this year

[@unkindledashy9397]

Itachi Uchiha how was it my dude I’m doing mine this year

[@mollyfraha723]

Thanks to you I have hope of getting an A+ thank you so much and God bless you😩😩😩😩😩

[@ChemLectures]

glad it helped

[@mollyfraha723]

Please make some o level physics lessons as well coz the chemistry ones helped me so much to a point where chemistry is now one of my favorite subjects 😁😁😁

[@marymusamba6020]

Thank you sir for the lesson. They are helpful but am asking if you can do a video lesson on natural polymers.

[@maidahzuberi9892]

thank you so much. your videos really helped me understand the concepts better.

[@ChemLectures]

glad you found them useful

[@maidahzuberi9892]

@@ChemLectures sir I wanted to ask you that I am currently scoring marks in 60s in p2 of gcse. And I want to improve but each time a practice a different question paper, I get the same marks so what should I really do to get marks more than that? like marks in 70s/75. I know that would be dumb to many others but that is my top most priority to get better in chemistry. So any tips to improve?

[@himashim]

brilliant work]

[@shamimamaryam7621]

Thank u!! The videos are really helpful ☺☺ But could u please cover the topic soaps, fats and all in organic chemistry?

[@weijie6726]

amazing vid u helped me to understand chem thank you so much

[@ChemLectures]

great!

[@shayanfaisal8822]

Sir you are just awesome Love you sir

[@humzanoor6225]

Sir you missed natural polymers, fats carbohydrates and amino acids pls make a video on them aswell thank you so much!

[@aliaitazaz7040]

Helped me at the right moment😊😊

[@ChemLectures]

great!

[@infjkairosclerosis]

Mr Chua Tung Kian needs to congratulate me to reach the end of all these three parts XD

[@jasperk2594]

Hi Sir, I've watched 90% of all the videos in the lecture series and I really find them extremely helpful. I have my Chemistry Prelims coming up this Friday and i've never felt so prepared for any chemistry exam since last year! However there are also some questions i would like to clarify. When a question asks for the repeat unit of polyethene for instance, do we have to write it as - (C2H4) -n or just - (C2H4) - ? because according to my textbook this year it shows that - (C2H4) -n is actually the structure of polyethene and - (C2H4) - is the repeat unit but it says otherwise in the video. (4:51) Also, i would like to ask how u got the value (2n-1) for the number of moles of water for condensation polymerisation of nylon at 8:20. Once again thank you for all the help!

[@ChemLectures]

both are ok. just go with the one in your textbook in case the mark scheme set does not accept other forms; as for the 2n-1, its because if you observe, 2 molecules come together and only lose 1 molecule as water. if 3 comes together, they will lose 2 molecules as water (2 bonds are formed). if 4 comes together, they will lose 3 (3 bonds are formed), and so and so forth. So 2n-1 number of moles of water.

[@shayanfaisal8822]

Sir you are great ♥️

[@ChemLectures]

thanks!

[@darkpurple3283]

This is the best set of videos I have come across! Thank you for the effort! Can I ask, when we draw a structure of the repeating unit, do we have to write subscript " n" after drawing in the brackets? Or no need?

[@ChemLectures]

+Dark Purple yes you need

[@darkpurple3283]

ok so actually, if they ask me to draw the polymer formed is it the same as asking me to draw a repeating unit? I thought must put n if showing the polymer and no need to put n if showing the repeating unit. Thanks!

[@ChemLectures]

+Dark Purple to draw the polymer, you can draw 3 repeating units, then end the two sides with squiggly lines. normally you draw horizontal lines, then put the bracket and n. there are different ways of answering the polymer qn, but so long as you do not draw the monomer structure, you will be fine. the drawing for repeating unit and polymer is sometimes used interchangeably, i.e., with the brackets and n. BUT NOT THE MONOMER DRAWING.

[@darkpurple3283]

+Chem Lectures (Chua Tung Kian) Thanks for clarifying!

[@waniasiddique9346]

Why we wrote opposite on one side and correct on other at 8:38 on diamine formula Please explain quick sir

[@waniasiddique9346]

Is carbon monooxide also produce on 15:24?

[@sobanshahzad951]

God bless you sir!!!!

[@ChemLectures]

thanks. glad you found it useful

[@comicanime7593]

thanx a lot

[@devnavinmadeswaran5939]

Thanks sir!

[@ChemLectures]

welcome

[@ziadahmed9270]

mr.chua is there any video in your playlist explaining more about balancing equations

[@ChemLectures]

There isnt a specific video for this because many equations are slowly introduced in each chapter. You may want to look at mole concept, acid bases and salts, ionic equations misconceptions for more info.

[@ziadahmed9270]

@chem lectures anayway thank you mr chua my exam is 5 days later.. idk what would i do without ur channel

[@ChemLectures]

All the best!

[@FARASATX]

Amazing series!! I will be giving my olevel exams this year. Since this series was made a few years back, is there anything new added in the olevel syllabus that hasnt been covered in this series? If yes, then please tell me the names of those new topics which i can revise.

[@ChemLectures]

it depends on your country's O level syllabus. varies across.

[@tashfeenzaman9929]

Sir do you know some related awesome channels like your for other subjects like physics.?

[@ChemLectures]

Not that I know of

[@darkpurple3283]

What is the mass of polymer formed from 100g of this polymer: CH3-CH(OH)-COOH ? The answer is supposed to be 80g but I calculated 70g. Any views?

[@ChemLectures]

+Dark Purple did you consider the water molecules that would be lost when the hydroxyl groups and carboxylic acid groups react to form the ester bond? write the general equation out to show how many water molecules are lost per 2 monomers reacting. then work from here.

[@sohaibbaig4655]

Sir, why is it not a carbohydrate at 10:40? It does have carbon, hydrogen and oxygen only.

[@ChemLectures]

because the question has alr said perspex. and most of the carbohydrates are very simple structures, e.g., repeating glucose units etc.

[@hadibhatti8941]

Thank u sir

[@ChemLectures]

welcome

[@sunshine8512]

why don't u upload such great lectures for as and a level chemistry 9701 plz sir

[@ChemLectures]

cuz i'm rather busy now...hoping to find time to do it soon!

[@sunshine8512]

sir plz do it know.. now or never

[@shumiamzehra1518]

I studied the entire chemistry syllabus from your videos and notes. you're a brilliant teacher, thank you so much! managed to score an A!! Also, if you're not making videos for A levels, do you have a recommendation for another channel or teacher online?

[@ChemLectures]

that's good to hear! Not any that i know of for A levels though...sorry about this

[@ibraheembaloch9772]

what is the difference betweeen condensation and addition polymrisation

[@ChemLectures]

this is covered in both the notes and videos.

[@ibraheembaloch9772]

i mean that if water is removed then it is condensation and if not then it is addition polymerization?

[@ChemLectures]

addition polymerisation by its name means to add, So nothing is lost during the process. condensation polymerisation means to join monomers together with the loss of a small molecule per 2 monomer units. This small molecule can be water, HCl, etc etc.

[@tayyabmuhammad4144]

This video was uploaded on May 2014 and since then Syllabus was changing year by year but still, its 2017 almost 2018 2 months left, its very very helpful. Thank you so much sir for your efforts. May ALLAH bless you! was great help for me ^^

[@ChemLectures]

thanks

[@budderminerluey]

hi is it still true that polymers are mixtures? arent polymers monomers bonded by chemical reactions?

[@ChemLectures]

yes. because a polymerisation reaction doesn't go to completion. there will be polymers of varying lengths, a various stages of polymerisation etc.

[@heroman1596]

can you tell me what is the diffrence between macromolecule and polymer.

[@ChemLectures]

+Hero Man a polymer is a macromolecule. but a macromolecule may not be a polymer. e.g., diamond is a macromolecule, formed by carbon atoms covalently bonded to each other in a tetrahedral arrangement. A macromolecule is a very large molecule, hence the prefix macro. A polymer is made of repeated molecules held together by (covalent) bonds to form a long chain.

[@heroman1596]

+Chem Lectures (Chua Tung Kian) thanks sir

[@Magicpeach7505]

Chem Lectures

[@barbiesusu9313]

can you send me the lectures notes by mail ? as i can't sign in www.chemlectures.sg

[@ChemLectures]

try to register an account first

[@musaraza3869]

Dear sir, I have my chemistry CIE tomorrow and I owe you a huge thanks for helping me understand Chemistry so much better. As I had said before, you are a very blessed teacher and I am grateful to have come across you.