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AQA Chemistry Unit 2 (resit) CHEM2 10th June

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Original post by man i
so what do you lot think 85 for an A


Hopefully lower😭
Reply 121
Avatar for r p
r p
5
How many marks was the "why should you not acidify naclo" or whatever it was??
Yes, the barium and iron reaction both needed state symbols.
Original post by r p
How many marks was the "why should you not acidify naclo" or whatever it was??

2 marks
Original post by r p
Omg how do u get trichloromethane or whatever it was.. What was the equation?!


CH3Cl+2Cl2 ---> CHCl3 + 2HCl was my answer
Reply 124
Avatar for ELCRE
ELCRE
5
Original post by r p
How many marks was the "why should you not acidify naclo" or whatever it was??


2 marks i think, what did you put for it?


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Original post by ELCRE
The ba2+ + so42- ---> baso4 also required state symbols


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You didn't need to for question 7 right? The metal extraction one with the Zinc roasting/Titanium extraction etc.
If not I'm screwed....
Original post by mgill17
You didn't need to for question 7 right? The metal extraction one with the Zinc roasting/Titanium extraction etc.
If not I'm screwed....


Na, you don't, didn't say it on the markscheme when roasting reactions came up before.
Reply 127
Avatar for ELCRE
ELCRE
5
Original post by mgill17
You didn't need to for question 7 right? The metal extraction one with the Zinc roasting/Titanium extraction etc.
If not I'm screwed....


Nope im pretty sure that did not need state symbols so you're good :smile:


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Was it not Mg with water?
Reply 129
Avatar for 97Y
97Y
11
Original post by ELCRE
2 marks i think, what did you put for it?


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Equilibrium left, produce toxic Cl2
Reply 130
Avatar for r p
r p
5
what did ppl out for the 2 environmental and 1 economic advantage of using low grade ore?? I put:
Environmental: no SO2 released - no acid rain
Less energy required, less fossil fuels burnt
Economic: scrap iron is cheap

Do you think that's ok?
Reply 131
Avatar for ELCRE
ELCRE
5
Original post by 97Y
Equilibrium left, produce toxic Cl2


Crap my mind went black & i put hcl will be produced witch is toxic and corrosive :frown:(


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Original post by WhoDaresWins
Was it not Mg with water?


It was Mg with steam/H2O(g)


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Reply 133
Avatar for r p
r p
5
Original post by ELCRE
Crap my mind went black & i put hcl will be produced witch is toxic and corrosive :frown:(


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Haha I put exactly that too, woops. It is defo that cl2 is produced :frown: but hopefully the toxic COULD get us a mark? 😂
Original post by ELCRE
Nope im pretty sure that did not need state symbols so you're good :smile:


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Oh thank god, definitely put them for the Cu/Fe question and *hopefully* i did for the Barium one...I can't remember... Thought I'd lost a good 5 or 6 marks for a minute!
Thanks!
Original post by ELCRE
Crap my mind went black & i put hcl will be produced witch is toxic and corrosive :frown:(


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I don't think that's wrong cuz it didn't say le chateliers - it said state the danger or hazard - one of them is hcl is corrosive which is 1 mark


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Original post by Escobarnos10
Anyone else get 351 kjmol-1 for the bond enthalpy question?


Did you have to make it negative because it was exothermic?
is there an unofficial mark scheme up yet. lol i can't get my head straight until i have seen what i got right and wrong
how many marks do u think they will take off for not putting the working for the C-C question
Original post by Sam Webb
Did you have to make it negative because it was exothermic?

Bond enthalpies aren't ever negative. :]

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