Aqa chemistry unit 2 gcse 24th jan

Reply 20

ACarter8

2

The only thing im worried is acids,bases and salts.

Reply 21

Mrkingpenguin

18

official thread http://www.thestudentroom.co.uk/showthread.php?t=2233530&page=4

Reply 22

Meesh14

2

Original post by LemonFish

Go on the My-GCSEScience website or search for it on youtube, there will be some videos there which can help you with electrolysis :wink:

thanks i used it now im an expert :wink:

Reply 23

ethanethan

The test was okay today actually, the six mark question was a nice one as all the information was there. Oh and nobody in my school managed to work out the empiracal formula, I got N (1) Cu(3)? Anyone else get that? The first question was quite tricky too...?

Reply 24

laylarose

14

Original post by ethanethan

The test was okay today actually, the six mark question was a nice one as all the information was there. Oh and nobody in my school managed to work out the empiracal formula, I got N (1) Cu(3)? Anyone else get that? The first question was quite tricky too...?

I also got N (1) C (3) :yep:

And yeah, the six mark question was awesome. I was so glad it was something like that, most of the info was there, just had to add a tad of your own knowledge! :biggrin:

The first question, I think, the cloudiness was due the solid compound (I can't remember the name of it) because it's a precipitate. I wrote something along those lines. What did you write?

Reply 25

Tayla

Original post by ethanethan

The test was okay today actually, the six mark question was a nice one as all the information was there. Oh and nobody in my school managed to work out the empiracal formula, I got N (1) Cu(3)? Anyone else get that? The first question was quite tricky too...?

I got cu3n too :smile:

I thought the first one was tricky too, I said a precipitate is produced but I'm not sure it's right :smile:

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Reply 26

KanikaPurple21

What did you guys get for the second last question? The calculation one...

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Reply 27

IsaacIIV

6

If memory serves correctly:

2Fe + ??? --> 2FeCl3 + ???
how many grams of copper chloride does 11.2 grams of copper make.

• the mole of Fe (nFe) = mass / ar = 11.2 / (56) = 0.2
• the mole of FeCl3 (nFeCl3) = nFe = 0.2
• therefore, mass = nFeCl3 * Ar = 0.2*(56+(35.5*3)) = 32.5
Answer... mass = 32.5 grams

(edited 11 years ago)

Reply 28

IsaacIIV

6

Original post by Tayla

I got cu3n too :smile:

I thought the first one was tricky too, I said a precipitate is produced but I'm not sure it's right :smile:

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On the first question, the products of the reaction were: --> H2O(aq) + NaCl(aq) + S(s)
as Sulfur was the only element to be in solid form (as opposed to aqueous), I too assumed it was a precipitate (insoluble salt), which are generally brightly coloured.

I also got Cu3N as the empirical formula, lets hope it's right :smile:

Reply 29

huds0ndev0n

8

I got Cu3N for that one too! :biggrin:

^.^

Did anyone else struggle with the questions about Copper Sulfate and the crystals? If anyone could enlighten me about that section, that would be great! :smile:

Otherwise, I thought the paper was fairly easy. Hoping for low grade boundaries and high marks!

Reply 30

IsaacIIV

6

Is there any particular part of the Copper Sulphate crystals question you want to be 'enlightened' on, or just a general overview of the process.

As far as I can remember, sulphuric acid and copper hydroxide(in excess) were mixed together, they were heated (this was either to speed it up/provide activation energy or because it's endothermic - I don't know). Next the solution was FILTERED to remove the excess copper hydroxide, after this, the solution was EVAPORATED to remove half of the water & was left to CRYSTALLISE.

the formulae for a neutralisation reaction is: (H+) + (OH-) --> h20

Reply 31

KanikaPurple21

Original post by IsaacIIV

If memory serves correctly:

2Fe + ??? --> 2FeCl3 + ???
how many grams of copper chloride does 11.2 grams of copper make.

• the mole of Fe (nFe) = mass / ar = 11.2 / (56) = 0.2
• the mole of FeCl3 (nFeCl3) = nFe = 0.2
• therefore, mass = nFeCl3 * Ar = 0.2*(56+(35.5*3)) = 32.5
Answer... mass = 32.5 grams

Thanks for that answer. Such a relief...I got 32.5 too.

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Reply 32

KanikaPurple21

Original post by IsaacIIV

Is there any particular part of the Copper Sulphate crystals question you want to be 'enlightened' on, or just a general overview of the process.

As far as I can remember, sulphuric acid and copper hydroxide(in excess) were mixed together, they were heated (this was either to speed it up/provide activation energy or because it's endothermic - I don't know). Next the solution was FILTERED to remove the excess copper hydroxide, after this, the solution was EVAPORATED to remove half of the water & was left to CRYSTALLISE.

the formulae for a neutralisation reaction is: (H+) + (OH-) --> h20

I put the reversible reaction arrows in the neutralisation equation. Hope it doesn't loose me marks....but thanks yet again! You're absolutely correct with the crystals process....should get maximum marks on that :tongue:

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Reply 33

Meesh14

2

Original post by ethanethan

The test was okay today actually, the six mark question was a nice one as all the information was there. Oh and nobody in my school managed to work out the empiracal formula, I got N (1) Cu(3)? Anyone else get that? The first question was quite tricky too...?

Yeah i got that too

Aqa chemistry unit 2 gcse 24th jan

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