For the Lidocaine, did anyone put that it could be dissolved in water so it is able to be injected into a specific area (as it was a local anaesthetic) and that a solid tablet would not focus on a specific area ?

Lidocaine Hydrochloride is soluble in water whereas Lidocaine freebase is an insoluble oil

The HCL can be dissolved in your blood the freebase can not

Reply 766

Ohnis

Well that was f**king brutal

Reply 767

man i

i thought this exam would be hard but doable but no im effed up add that to the fact that chem 5 is coming up only god knows how hard thats going to be

Reply 768

Adami97

Original post by Boundless_x

Hey everyone, I'm heading to school now and I just wanted to wish everyone GOOD LUCK! Even if there are things you keep forgetting, don't panic, it will come to you once you're in the exam! See you guys after the exam.... :smile:

No amount of luck could help anyone in that exam! I actually want to cry 😰

Reply 769

GabrielSmith1998

Original post by Cadherin

I hope so :/

When I say 'wasn't too bad', I mean, compared to the potato in AQA physics last year, not too bad.

ah I see. I found it so bad D:

Reply 770

SirRaza97

In all honesty I thought the exam was pretty straight foward. They tried to make it over complicated to f*** people over by adding like 25 benzenes to a question and making some spooky rate calculations and stuff. The last question I got a tertiary alcohol which sucks. Grade boundaries will probabaly be lower since I think it was harder than other papers.

Reply 771

Lamonsta

for the very first ph question, I got 1.42?

everyone else is saying around 2 something but from a past paper with a similar question it said '25cm3 sample of 0.0850 HCl' placed in a beaker and 100cm3 water added . The mark scheme wanted you to do 25 +100 = 125 then 125/25 = 5 then 0.0850/5 then log this answer.

and the first question was basically the same as it started with 100cm3 and 50cm3 added so 150/50 = 3 so I divided my answer by 3 and logged it.
I only remembered that because I went over it this morning
did anyone else get 1.42?

Reply 772

Engineerrookie

Rate equation no longer has propanone in it because it's concentration is now so large it is considered a constant,

I got the last question wrong do you think i will get any marks I got

CH3 O CH2CH2C(CH3)2OH yes it's a tertiary alcohol :frown:

Reply 773

clarkey500

Original post by thomaarrss

**** i got 22/233

I got a number between 8 and 10 but I can't remember what

Reply 774

Rabadon

Got ch3-o-ch2-ch2-coh(ch3)2 same as loads of you

but it's tertiary alcohol so wrong fml

Reply 775

the1pedro

Original post by scienceman

What were the reagents and conditions in the organic synthesis question?

For the conversion of the haloalkane to the nitrile I put KCN dissolved in ethanol.
And for the conversion of the nitrile to the amine I put hydrogen with a nickel catalyst.
Thinks this was the last part of that question 😁

(edited 7 years ago)

Reply 776

SirRaza97

Original post by Anno007

Step 3 was KCN reflux in ethanol
LiAl4 in dry ether

Do you think Ni/H+ in ether will be right as well for step 4?

Reply 777

Analise_unknown

Original post by thomaarrss

this threw me as well

I'm up for complaining, I know that AQA are doing some weird stuff this year because the resort biology paper i did had new spec stuff in it which we had never heard about before, I'm really disappointed!!

Reply 778

F*ckchem4

My name speaks a thousand words....

Reply 779

Examguy123

Original post by cookiemonster15

That was horrendous. Did anyone else find that the questions were so awkward?

And there was nothing on equilibria, buffers or not many mechanisms either.

I'm so annoyed.