Thankyou so much. I missed this topic due to illness and the videos have been a massive help :D

Can you please make more videos on this module before the f324 exams in june? youre videos are so helpful! thank you very much sir

Do you think you'll be able to do any videos on polymerisation before the F324 exams in June? I'm really struggling with it :( many thanks for your great work!! You are really helping me achieve my A, hopefully!!

@MaChemGuy

9 жыл бұрын

JJackson584 Can't promise. Will try my best

Hello, thank you for the video! Looking at the example where lysine is in the pH of 10.59? I see that NH3+ donates a proton as -OH acts as a base, but why can't the NH2 donate a another proton to form NH and then further donate to form N2+? Thanks

Will this playlist cover the content in this module?? And what abut all the other playlist? thank for the vids

Hello there :) just to clarify, in alkaline hydrolysis does one of the H+ from the NH3+ join with the OH- ions to form water? if yes is it necessary to include the water molecule when writing out the equation?? Thankss!

Hi, thanks for your videos! They're great! Just one question, why does an -NH2 group on the side chain make the isoelectric point higher, and a -COOH group on a side chain lower the isoelectric point?

@MaChemGuy

8 жыл бұрын

The NH2 group is a base (H+ acceptor) and the COOH group is an acid (H+ donor)

@xgymnaztx

8 жыл бұрын

+MaChemGuy How does this result in the isoelectric points changing? Thanks!

@MaChemGuy

8 жыл бұрын

+Rach J The answer is way beyond A level but it's to do with the fact that amino acids have 2 pKa's and the isoelectric point is midway between the two. Adding extra groups to the R group alters the midpoint. See www.mhhe.com/physsci/chemistry/carey5e/Ch27/ch27-1-4.html if you really want to know.

@xgymnaztx

8 жыл бұрын

+MaChemGuy Okay thank you so much!!

is there any chance you could do a video on polyamides and polyesters?

@h9.k

7 жыл бұрын

same

sir just a quick question, when the zwitterion is below its isoelectric point ( acidic) , i thought its NH2 instead of NH3 >

@josephsimeon6160

8 жыл бұрын

I think about it as below Isoelectric point (more acidic) there are loads of H+ so NH+ and COOH. But above the IP, there is an absence of H+, this means all H+ taken so NH2 and -COO. I hope I helped.

Hey sir, was just wondering are zwitterions and triglycerides still present in new spec OCR A Chemistry ?? Thanks in advance

@MaChemGuy

5 жыл бұрын

Yasmin Mohammed Both have gone. Wouldn’t put it past ocr to ask a suggest question around triglycerides but they’d give you a lot of the necessary information in the question (ie you’re not expected to know in advance)

@mintyasmr3052

5 жыл бұрын

@@MaChemGuy Ok thank you so much

hello sir do we need to know what a beta amino acid is or do we not? thank you

@MaChemGuy

8 жыл бұрын

Not for OCR. I just mention it to make the point that there are other types of aa's

@xxxx-nd5cr

8 жыл бұрын

+MaChemGuy thank you, i have my mock tomorrow for chemistry and i feel really prepared due to your videos thank you again :)

sir please do exam paper tutorials, would be really helpful! often what tends to happen is i get the material but when it comes to application i struggle. PLEASE PLEASE go through A2 OCR chemistry papers! lastly, thank you for this excellent support

@MaChemGuy

8 жыл бұрын

+zannatul Zan Have already done some (see playlists). About to start a series of videos called 'how to answer' (made a quick one this morning)

@MaChemGuy

8 жыл бұрын

+Alaric III Thanks for replying!

@zannatul23

8 жыл бұрын

***** yeah i saw, but theres like only one paper, it would be really useful if sir could do more. thank u and machem sir for replying.

@josephsimeon6160

8 жыл бұрын

He's done more now