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

Anyone know how the machine that marks the multiple choice works, worried it wont pick up on my crosses because my pen had started to die

As long as your crosses have enough contrast against the white paper the optical mark recognition software will pick it up, and I imagine it's smart enough to send it for human review if it's uncertain.

I really do hope you're right, but it's been 80 for a* twice before and I don't see this being any different. But I do hope you're right.

How the hell does that work then when you cross one out? I made a mistake in physics so I had to cross it out and tick another box, I even circled the box. Also, my pen blotted one of the boxes (the one I chose) in one of the MCQs, is that a problem?

As long as your crosses have enough contrast against the white paper the optical mark recognition software will pick it up, and I imagine it's smart enough to send it for human review if it's uncertain.

what did everyone write for the vanadium 5 mark question at the begginging when it was asking for its oxidation state at the end of the reaction ?????//

For the 5 mark percentage by mass question how many significant figures did it ask for? I'm overthinking and worrying I've lost a stupid mark hahah

I already asked this at the start but the discussion was moving so fast it was probably missed.

What did you guys write for the very last 2 marker about the cations and anions?

I already asked this at the start but the discussion was moving so fast it was probably missed.

What did you guys write for the very last 2 marker about the cations and anions?

Was ethanoyl chloride the answer to anything?i remember writing it down but no one here's mentioned it

I was a bit stupid in the 5 marker and put these steps:

Reflux: KCr2O7 to make carboxylic acid intermediate

HCL (I know that's wrong, it's PCl5) to make Acyl Chloride intermediate

NH3 to made amide product

Would I get 2 marks or get the third step right?

I wrote COO- and NH3+ for all of those groups but I really am not sure

I'm not sure either but I did this:

Amino acid = NH₃⁺[Nonsense part of molecule]COOH
Acid: [Nonsense part of molecule]COO^-

So basically the amino acid was a zwitterion that got protonated by the carboxylic acid.

----

What I'm not sure about was if you were meant to put them together (like a salt) or write both anion and cation separately. I chose the latter.

Sorry if it looks like I don't know what I'm talking about, I didn't even know what zwitterions were until yesterday afternoon where I had to learn transition metals, arenes, nitrogen chem and organic analysis. God bless Geroge Facer and chem revise loool

The question didn't specify conditions just reagents and intermediates.

So the marks will be,
Excess K2Cr2O7
Dilute H2SO4 (1)
Benzoic Acid Intermediete (1)
Add PCl5 (1)
Benzoyl Chloride Intermediete (1)
Add NH3 (1)