Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread

I didn't put equilibrium arrow for the sunglasses so fml lol. And that cisplatin bs, then why there's geometrical isomers. The very last cation and anion thing idk either. That's about it that I got wrong/not sure. Might have lost a few marks for writing question for not making the point they want me to make but oh well. Fingers crossed for 100% UMS but not sure tbh

I meant for the PCl5 reaction, sorry xD

I have no idea then, I didn't do Jan 2016 paper. Was it the same molecule?

dont think you need to put the equilibrium arrow do you????

Haha yeah me too in the same areas (except the equilibrium thing). I think I got the one about a reason for why 3 steps is better wrong (I said uses less environmentally harmful chemicals) and the one about the problem of one isomer of the drug or whatever wrong :// I know for sure that I got the MCQ about the molecular formula wrong also. But on the whole, not too bad ?!

I thought it was because of steric hindrance due to the lone pairs on the delta negative oxygen and nitrogen being so close together so two hydrogen bonds couldnt form per molecule

Can you remember the main Q in section B? how many were there (like big questions, not parts lol). Like the first one was about E cell and vanadium, etc.?

For the 2-Nitrophenol and 4-Nitrophenol is it to do with the intermolecular hydrogen bonding and intramolecular hydrogen bonding? And also for the last questions do both cooh turn to coo- and both nh2 turn to nh3+

I said that there's less waste because that's what the passage said lol

Well then I have no idea lol

Uh no I can't remember, I just remember seeing loads of TM and benzene rings lmao

Ohhh nah that's a by-product so we didn't even need to include it xD Btw u look familiar do I know u???

For the 2-Nitrophenol and 4-Nitrophenol is it to do with the intermolecular hydrogen bonding and intramolecular hydrogen bonding? And also for the last questions do both cooh turn to coo- and both nh2 turn to nh3+

dont think you need to put the equilibrium arrow do you????

Methyl 2-hydroxybenzoate molecules are held together by (strong) London/ dispersion forces IGNORE Dipole forces and hydrogen bonds (1)Less / limited hydrogen bond betweenwater and methyl 2-hydroxybenzoate (so sparingly soluble) (1) The hydrogen bonding between water molecules is (very) strong (1)Insufficient energy released to break hydrogen bonds in water/ London forces in methyl 2-hydroxybenzoate (1) (Some of the) hydrogen bonds are internal in methyl 2-hydroxybenzoate (1) The oxygens in methyl 2-hydroxybenzoate can form hydrogen bonds to the hydrogens of water molecules OR The hydrogen on the oxygen in methyl 2-hydroxybenzoate can form hydrogen bonds to the oxygens of water molecules (1)

That's the mark scheme.
This question is about solubility though.

@C0balt 'Twas just one reaction for the vanadium iodide ion thing right?

If not then your glasses would permanently look black XD

Lol well then
Why does everybody seem to know intramolecular hydrogen bonding here, never thought or heard about it before lmao
I said they both form London permanent dipole hydrogen bonds but 4 packs better and so stronger London forces. I don't think I get the mark then

Yeah

The question in the jan 2016 paper was preceeded by some information about the internal hydrogen bonding thing, so I would expect they'd expect you not to know about it and may give you at least a mark for talking about regular packing.

In which step?

Methyl 2-hydroxybenzoate molecules are held together by (strong) London/ dispersion forces IGNORE Dipole forces and hydrogen bonds (1)Less / limited hydrogen bond betweenwater and methyl 2-hydroxybenzoate (so sparingly soluble) (1) The hydrogen bonding between water molecules is (very) strong (1)Insufficient energy released to break hydrogen bonds in water/ London forces in methyl 2-hydroxybenzoate (1) (Some of the) hydrogen bonds are internal in methyl 2-hydroxybenzoate (1) The oxygens in methyl 2-hydroxybenzoate can form hydrogen bonds to the hydrogens of water molecules OR The hydrogen on the oxygen in methyl 2-hydroxybenzoate can form hydrogen bonds to the oxygens of water molecules (1)

That's the mark scheme.
This question is about solubility though.