Chemistry: Post your doubts here!

[Shemyaa]

Yes everything was perfect except that a and b question and the tangents one

Yes I found the a and b the most confusing to me

 

[BUNS AT A LEVEL]

Paper 42 Does anyone still remember what they wrote about the Rf when it became more polar? Also was A:leucine, B:glutamic acid?

 

[Super Saiyan 007]

If youre talking about practicals (obv)
There are a couple important things,
-Always make sure you're following the steps, dashed lines indicate continuation of the question, I find many students (including me at times) forgetting this point.
-Write whatever you see (effervescence/ colour change) and also, sometimes wait for some time the colour will change when exposed to air and can indicate a cation here
-Whenever you're dealing with NaOH always wear goggles, and have your damp litmus paper ready since it can be used to indicate NH3
-If the litmus paper doesn't change, you're either left with the possibility of it being Hydrogen, Oxygen or CO2
based on the number of exps I did, usually, its CO2 so write turns limewater milky(even tho you don't need to do it in particular)
-Revise organic notes, Idk if you did the exp but there are years where salt analysis is literally organic and tbh its the easiest because you don't get to confuse like finding out cations and anions
-Don't wet your paper,
-ALWAYS test for solubility in excess, like don't just say insoluble, add more of the reagent and if its insoluble say insoluble in excess
-Make sure you understand the difference between turbid and precipitate
-It will be helpful if you write a list including soluble salts and insoluble salt (can find it in youtube), helps me ALOT in estimating what the compound might be.
- Stay calm and don't do things in a hurry

Appreciate it . Btw other than analysis , any other tips you might want to share for questions regarding titration or enthalpy changes ? . TIA!

 

[Shemyaa]

Appreciate it . Btw other than analysis , any other tips you might want to share for questions regarding titration or enthalpy changes ? . TIA!

I'll make sure to update you with it I do have a list,
I'll post them after theory exam is done,
keep up to date
What does TIA mean tho :")

 

[Super Saiyan 007]

I'll make sure to update you with it I do have a list,
I'll post them after theory exam is done,
keep up to date
What does TIA mean tho :")

**Thanks in advance . You're in A2?

 

[Shemyaa]

I'll make sure to update you with it I do have a list,
I'll post them after theory exam is done,
keep up to date
What does TIA mean tho :")

**Thanks in advance . You're in A2?

No hahaha I'm in AS
And its okay

 

[Super Saiyan 007]

Which practical are you giving ? P33 or P34?

 

[Shemyaa]

**Thanks in advance . You're in A2?

Oh I'm just figuring out, so you're A2 your practicals are written.
Good luck with that.

 

[Shemyaa]

Which practical are you giving ? P33 or P34?

34

 

[Super Saiyan 007]

My practical is just after the P2 . I'm hoping the examiners dont give horrifying questions on Organic .

 

[Shemyaa]

My practical is just after the P2 . I'm hoping the examiners dont give horrifying questions on Organic .

Ah yes I wanted 33 but I chose 34 since I'll have arabic as first language on that day plus I have a week where in 4 days I have 5 board exams so I wasn't ready to add one more to the list :")
Focus on your theory part for now and just don't be scared I think chem P2 will be a bit hard this year,

 

[Super Saiyan 007]

Ah yes I wanted 33 but I chose 34 since I'll have arabic as first language on that day plus I have a week where in 4 days I have 5 board exams so I wasn't ready to add one more to the list :")
Focus on your theory part for now and just don't be scared I think chem P2 will be a bit hard this year,

Threshold around 43-44 would be fine depending on how well students do

 

[A*****]

did u take p42?

Yes

 

[A*****]

Paper 42 Does anyone still remember what they wrote about the Rf when it became more polar? Also was A:leucine, B:glutamic acid?

I wrote it would increase. Yes I think you are right about the amino acids

 

[helloolo]

Did 41

Nmr CH3CH2OCH2COCH3
Vap 31

Got the same

 

[darkxangel]

Hi, I really need help with this question!
Edexcel A level chemistry Jan 2015 IAL WCH03/01
Q3 b (iii)
Why is uncertainty value times by 2?
Thanks

 

[mygjjk]

Hello, I need help for question 4 d iii) from Oct/Nov 2018 paper 21... Suggest a structure for Y...



Here is what the mark scheme says:


Can someone tell me how you get this answer? Why is it an ester group, and also why is it cyclic?

 

[fourtris46]

anyone has paper5 notes ?

 

[mittul8yu98]

I need p5 notes too

 

[MShaheerUddin]

ER says "A common error was to not show electrolysis apparatus rather an attempt at an electrochemical cell."
Can Anybody draw electrolysis apparatus?