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

What was the last MC question?

we were meant to apply what we know to this situation plus they gave more than enough information- it would be a completely different scenario if they told us nothing- then they would do something about it?

What was the last MC question?

Yeah, I agree. It was a tough question, but when you have people who have done all the past papers you have to put in something that's not been done before.



Hexane, water and iodine density question. (hexane + high iodine conc at top, water at the bottom).

That was option A right?

differences between D and the acid???

As long as you quoted values and binds you're okay I think
And I used the C-Cl and O-h but realised now that it was phenol so I lost a mark


I can't remember but it was quite small like +47 or something
I said no new precipitate would form on addition of excess acid
I said eq'm form for acid, carboxylic acid forms for acid but carboxylate for alkaline, alkaline higher yield and acid is slower

I didn't realise there was phenol so I lost a mark there

If you add a lot of phenol time taken would be too long and so during that time the conc of reactants would've changed significantly therefore the rate at the time of colour change would be significantly different from initial rate

I said there would be misty white fumes of HCl with D but not with the acid. How many marks was it ?😩😩


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I don't think you loose a mark, because O-H IR absorption a for carboxylic acid and phenol are different

The hazardous substance was Ba(OH)2 because it is a caustic Base

Do they not overlap though



It was either Ba(OH)2 being toxic or ammonia being toxic at high conc i think

I put the same, I think as long as you put O-H in carboxylic acids and gave a value you should be alright? They don't full overlap, phenol is 3750-3200, carboxylic acid is 3300-2500

Do they not overlap though



It was either Ba(OH)2 being toxic or ammonia being toxic at high conc i think

Do they not overlap though



It was either Ba(OH)2 being toxic or ammonia being toxic at high conc i think

Awww damn. I had written toxic then changed it to corrosive right at the end lol.

I remember that O-H in IR do overlap. On chem guide, for lactic acid (hydroxyl + OH from carboxylic acid) results in a very broad peak