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Aqa igcse chemistry paper 2 unoffical mark scheme

Can we start this?
Original post by diva.http
Can we start this?


How did you find it?? i want to check some of my answers that were numbers
Reply 2
Avatar for ali_a200
ali_a200
8
Original post by Brooke.taylor
How did you find it?? i want to check some of my answers that were numbers


The concentration was 0.4 and the enthalpy change was -1040
Reply 3
Avatar for ali_a200
ali_a200
8
Some answers I remember were that potassium iodide and silicon doxide must be mixed in water for ones of them to dissolve (cant remember which) and then filter and then distill.

Another was to do with solvency in chromotography where water had to be used instead of propanenensnanan.... watever so water carries it up and then also use a pencil line instead of ink
Original post by ali_a200
Some answers I remember were that potassium iodide and silicon doxide must be mixed in water for ones of them to dissolve (cant remember which) and then filter and then distill.

Another was to do with solvency in chromotography where water had to be used instead of propanenensnanan.... watever so water carries it up and then also use a pencil line instead of ink


for the silicon + potassium iodide could u dissolve in water, filter and then crystallise using evaporation?? Basically everyone in my school said it was really hard but I think weve all done much better than we think because lots of the graph questions were alright.

Also what did people get for the six marker?
I did that it had four compounds, only one was soluble in water, the molecular mass was 320, C was most abundant and b (?) was least abundant in the mixture
Reply 5
Avatar for ali_a200
ali_a200
8
Original post by Brooke.taylor
for the silicon + potassium iodide could u dissolve in water, filter and then crystallise using evaporation?? Basically everyone in my school said it was really hard but I think weve all done much better than we think because lots of the graph questions were alright.

Also what did people get for the six marker?
I did that it had four compounds, only one was soluble in water, the molecular mass was 320, C was most abundant and b (?) was least abundant in the mixture


Actually thinking about it yeah crystalisation makes more sense but idk most ppl in my year said distill
for the six marker yeah i have a friend who talked about abundancies which i have no clue what is, i didnt do well on that question even though i revised cuz i just frgt but the peaks tell u which substance is more present and the molecualr ion peak can identify the substance
Dual?


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Reply 7
Avatar for economy
economy
7
Original post by ali_a200
Actually thinking about it yeah crystalisation makes more sense but idk most ppl in my year said distill
for the six marker yeah i have a friend who talked about abundancies which i have no clue what is, i didnt do well on that question even though i revised cuz i just frgt but the peaks tell u which substance is more present and the molecualr ion peak can identify the substance


Couldn't be distill cause the boiling points were really high so not viable... crystallisation I reckon
Reply 8
Avatar for diva.http
diva.http
OP
1
Original post by Brooke.taylor
How did you find it?? i want to check some of my answers that were numbers


I found it really hard, especially the qwc. I got 0.4 for the concentration, and i got the enthalpy change one wrong it was -1040 i think but i got -112 as i forgot to times one of them by six

hopefully grade boundaries are really low
Reply 9
Avatar for ali_a200
ali_a200
8
Original post by economy
Couldn't be distill cause the boiling points were really high so not viable... crystallisation I reckon


distilling it by evaporating the water off leaving the the potassium iodid, yeah obvs u cant evaporate potassium iodide
proper hard
Reply 11
Avatar for diva.http
diva.http
OP
1
Predictions for grade boudaries ???
Reply 12
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diva.http
OP
1
i definetly lost at least 20 marks
(edited 7 years ago)
Reply 13
Avatar for diva.http
diva.http
OP
1
I think its going to be

63/90 A*
53/90 A
43/90 B
33/90 C

roughly, because it was harder than last years and last year it was 66/90 for an a*
Was the citric acid reaction endothermic or exothermic??
Reply 15
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diva.http
OP
1
Original post by cccccccccc
Was the citric acid reaction endothermic or exothermic??


The one you had to tick the box??

Endothermic
Reply 16
Avatar for kat.wade
kat.wade
You know the small table about temperature change, did it go 20, 9, -11 or 20, 9, 11? Would you get marks for forgetting the -?
Original post by kat.wade
You know the small table about temperature change, did it go 20, 9, -11 or 20, 9, 11? Would you get marks for forgetting the -?


No I'm pretty certain 20, 9, 11 would be correct
(edited 7 years ago)
Me and most of my year found the test easier than last year's. I'm predicting the grade boundaries around 65 - 67 for an A*.
Reply 19
Avatar for diva.http
diva.http
OP
1
Original post by kart1400
Me and most of my year found the test easier than last year's. I'm predicting the grade boundaries around 65 - 67 for an A*.



Really??? I found it really hard, and I'm Prettyy sure most of my year did too

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