Edexcel A2 Chemistry Unit 4 26/01/12 PM

Because they gave you the amount of hydrogen iodide at equillibrum and the initial. So to work out the moles which were produced/used for hydrogen iodide, you take minus the equllibrium moles from the initial. Then as the reactants were in the ratio of 2:1, you half it. This gives you the number of moles for the reactants for the two reactants. You were told in the question the initial that the initial moles for both were 1. So you minus the moles produced/used from the initial to get the moles at eqillibrium.

PHEW.

Do you think 'more reactive' will be a mark? lol

1. Yes I suppose. You do realise your words don't have to exactly match the mark scheme? As long as you get the point through, you get a mark.

2. I was explaining to the person I quoted why explaining why it is more reactive will get both marks, because that is what the question asked - why will reaction be faster - not why yield will be greater or other things - so yes, 2 marks for explaining reactivity for "why faster".

Oooo yes it did talk about why it would be faster. So talking about yield would be irrelevant (like irreversible).

I talked about
-How its more reactive.
-Leaving group - more better
-No equillibrium so more product (however the last point is more to do with yield)

Hope I get 1 mark.. lol

You're wrong.

Again.

I already said before that I may have read it wrongly so "again" is in appropriate. Have i not told you that everything included I lose 8 marks. Much greater than your "75ish". Someone just asked whether anyone else put aldehyde and I answered. Who the @#$%! are you to say that I am wrong.

I already said before that I may have read it wrongly so "again" is in appropriate. Have i not told you that everything included I lose 8 marks. Much greater than your "75ish". Someone just asked whether anyone else put aldehyde and I answered. Who the @#$%! are you to say that I am wrong.

I already said before that I may have read it wrongly so "again" is in appropriate. Have i not told you that everything included I lose 8 marks. Much greater than your "75ish". Someone just asked whether anyone else put aldehyde and I answered. Who the @#$%! are you to say that I am wrong.

You can't exactly assume you got every mark that you haven't been challenged on, especially for longer questions. Tbh from what you've mentioned about the exam you don't sound like you have only lost 8 marks. There will always be more you have overlooked.

It's been pointed out that edexcel made a mistake as sample materials aren't checked like these markschemes are.


Yes i emailed edexcel and yes your z answer is correct i would like to apologize for my error sorry for inconveince please do not take it on a personal note

seriously ? i mean shouldnt we encourage him instead ! and tell him there could be a chance that those answers could be right rather than telling him he may lose marks elsewhere ! come on..!

Yeh maybe I just think its stupid to say "I did better than you I think I got this you think you got this" when we haven't got the marks back yet. He seems quite self sure so I don't think he needs any particular encouragement.

guys stop arguing over spilt milk, the exam is already done, you had enough time to talk about it.....

does anyone have a copy of the paper
[email protected]
thanks

Hey did you manage to get the copy of the paper?

Having seen the markscheme, my 'expected' mark has decreased significantly.


Crap. LOL.