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

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An alkaline fuel cell does have a platinum electrode right? for the MCQ it was KOH for the electrolyte and platinum electrode?

Original post by oShahpo

I did the same but I shouldn't lose any marks as the reaction will most definitely proceed anyway. I said put excess ammonia to neutralise the acid too, just in case.

its out of 6, so i hope we only lose 2 marks :'(

Original post by payet27

Bro please help post the unofficial mark scheme, would be great!, thanks.

Loool it's all a blur I can't remember the questions xD I reckon @samb1234 and @C0balt might be better for this haha

Original post by razortoad

Pretty sure it was B because the monomer is formed from the C=C and not the nitrogen. This, again, has come up before exactly the way it was. They seem to like recycling questions a lot xD

for that one i did this ,

What was the answer to the mcq where it asks for the best explanation for why amino acids are solid?
I said the zwitterion one, but I have a bad feeling that the answer was that they're amphoteric.

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Original post by GrandMasti

An alkaline fuel cell does have a platinum electrode right? for the MCQ it was KOH for the electrolyte and platinum electrode?

Yeap

:biggrin:

I got 95.1% and I put B for the MC question about the really long amino acid chain question

Original post by GrandMasti

An alkaline fuel cell does have a platinum electrode right? for the MCQ it was KOH for the electrolyte and platinum electrode?

think it was graphite elctrode and oh electrolyte

@GrandMasti Fe3+ for catalyst?

Original post by DesignPredator

I wrote reverse but I still think dpp only will suffice because Cu reacts with Cu2+ to form Cu+, the same ELEMENT is being oxidised and reduced.

It needs to be the same species. Element doesn't matter

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Original post by Don Pedro K.

@GrandMasti Fe3+ for catalyst?

Yep

:smile:

What was the salt bridge for the hydrogen electrode? NaCl?

Original post by oShahpo

What was the salt bridge for the hydrogen electrode? NaCl?

I said potassium nitrate

But NaCl should be fine I think

(edited 7 years ago)

Original post by Don Pedro K.

Loool it's all a blur I can't remember the questions xD I reckon @samb1234 and @C0balt might be better for this haha

I haven't got the time soz

Original post by GrandMasti

An alkaline fuel cell does have a platinum electrode right? for the MCQ it was KOH for the electrolyte and platinum electrode?

I put that as well, but I just looked it up and it's a porous carbon electrode. :/

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was paracetamol 95 %??????

For some of the ionic equations, was it okay to write it in terms of displayed structure (like the one with the amino acid)m

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Original post by C0balt

I haven't got the time soz

@cobalt , did you put graphite electrode for the mcq

Pleaseeee i beg someone actually post the unofficial mark scheme first then lets discuss!!!!!!!!!!!!!!

Which one was the polypropenamide monomer?

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