AQA Chemistry New AS Unofficial Mark Scheme

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I think it should be

It should be low, even though i didnt find it difficult but more than half of our class messed it up, i dont know how but i have to agree with them the style of question was bit different compare to old chemistry exams

Reply 141

DaVinciGirl

Original post by WhatIsSleep

I thought it'd be grey/black solid since iodine isn't a liquid at room temp (in fact it doesn't really exist as a liquid)?? idk though

I wasn't completely sure either. But I thought the potassium iodide is in solution other wise the reaction won't work. Like we can't just get two solids and have them react together without them being in solution. So then I used my knowledge that iodine in solution is brown. Not sure though.

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Reply 142

saahil0987

Original post by SM-

You covert the Mr to kg from g then divide by avagrados constant so mass of one particle found, then you just sub into equation

Yeah, I did all the that but its the just the velocity idk why

Reply 143

DaVinciGirl

Original post by sajanet

how many marks was this question with the barium sulphate?

It was 5 marks I believe. 1 marks for the precipitate and 4 marks for the calculation.

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Reply 144

M0nkey Thunder

Original post by DaVinciGirl

It was 5 marks I believe. 1 marks for the precipitate and 4 marks for the calculation.

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Fairly sure it was 4 marks, but what was the calculation?

Reply 145

DaVinciGirl

Original post by rosemondtan

That's unlikely! Don't forget to count in method marks :smile:

Sorry do you mean that I should be more generous in how much I thing I lost on marks? What I usually do is over exaggerate how many marks I got wrong so I won't be too disappointed in exam results day. If I get more than I expect to get then it's good for me :yep:

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Reply 146

DaVinciGirl

Original post by M0nkey Thunder

Fairly sure it was 4 marks, but what was the calculation?

I'm not that sure. Maybe someone else can reassure what mark it was. The calculation was about what's the percentage of magnesium chloride in the mixture of powders I believe.

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Reply 147

rosemondtan

Original post by DaVinciGirl

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Oops yup haha sorry it came out a little wrong!! I got around that too, lost around 10+ (Not counting method marks :frown:

) seems like you did fine on most questions though, so don't worry! Most annoying thing is when you know how to do the question and your method is correct, but you plug in a wrong number somewhere :s-smilie:

sigh smh

Reply 148

DaVinciGirl

Original post by saahil0987

Yeah, I did all the that but its the just the velocity idk why

You should have multiplied the energy by 2 then divide by the mass. Then you square root it.

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Reply 149

DaVinciGirl

Original post by dragonblazer11

also, what percentage did u guys get for the question with magnesium and barium chloride

Quite a lot of people got 33% or around that.

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Reply 150

rosemondtan

Original post by DaVinciGirl

I'm not that sure. Maybe someone else can reassure what mark it was. The calculation was about what's the percentage of magnesium chloride in the mixture of powders I believe.

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Yup 4

Reply 151

M0nkey Thunder

Damn, lost around 17-22 marks. I'm going to have to do a lot better on the second paper if I want an A...

(edited 7 years ago)

Reply 152

WhatIsSleep

How much was the whole paper out of? :/

Reply 153

Inteha

Original post by SANTR

It won't be below 80% unfortunately.

I dont think it would be that high cause this paper was nothing like the past papers and it was super hard. So hopefully they will be low.
Oh well who knows 😯