AQA GCSE Combined Science Paper 2 Higher Tier (8464/C/2H) -13th June 2023 [Exam Chat]

for the equilibrium one it told us that it was an exothermic reaction so the forward part is exothermic and backwards is endothermic, so the answer was it moves to the left because the reaction GAINED heat.

Sorry to break it to you, but... it wasn't spelled as magnesium. I thought so as well before I re-read it. That was a real eye-boggler!

i got 0.326

I just want to know how everyone got 0.3 something for the last question because i got 1.50? Were u not meant to only calculate the gradient using the tangent? SOMEONE HELP IM SO LOST.

Can someone tell me how many marks I would get for the 6 marker on chromatography:
1) Get your filter paper and draw a line near the bottom of the paper using a pencil (pencil marks are insoluble)
2) get your dyes and place them onto the filter paper making sure to leave space between them.
3) get a beaker with solvent.
4) place your filter paper in the solvent. Add a lid on top of the beaker to stop the solvent evaporation.
5) the dyes will move up the paper at different rate.
6) remove the lid and remove the filter paper.
If there are multiple dyes then the colour is a mixture.

seriously?? but Mongolian oxide isn't even a thing?

My bad, I was on the wrong area. I do Triple instead of Combined, sorry.

seriously?? but Mongolian oxide isn't even a thing?

Ah yes I remembered the name, it was manganese oxide

did everyone get 0.313 for the last question?
0.9 for the Rf value?
0.31 for the question asking for X?

It never specified that forward reaction was exothermic in the exam and it really put me off, idk what to believe yet. Does it always shift to the left if a reaction is exothermic and is an increase in temperature?
I mean it's only 1 mark but 1 mark could be the difference between a grade boundary so yeah.

it did specify that it was an exothermic reaction, and no the equilibrium doesn't always shift to the left if its exothermic, it depends on if the reaction gained or lost heat, in our exam it said heat was gained, so the equilibrium had to be on the left because gaining heat is endothermic which was the backwards reaction in our case (backwards meaning going towards the left). if it said it was LOSING heat, the equilibrium must have shifted to the right because losing heat is exothermic. sorry if this confused you at all.