Edexcel - Chemistry Unit 2 - 4 June 2013

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SophieL1996

3 moles ----> 5 moles

Decreasing the pressure causes EQM to oppose this change and side with the greater moles therefore moves forward

So yield increases but rate decreases as pressure is decreasing and less collision occurs between particles

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the mark scheme says its decreases rate but yield decreases though? :frown:

Reply 381

Priya08

Original post by Goods

only consider moles of gas.

Why moles of gas only ?

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Reply 382

Goods

Original post by Priya08

Why moles of gas only ?

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You can't change the pressure of a solid

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Reply 383

Mimi85

yo guys , can someone please post the 2013 jan unit 2 chem for me plz along with the msc , what are ur pridiction for this paper , i mean june .. harder or easier ?

Reply 384

Goods

Original post by Mimi85

yo guys , can someone please post the 2013 jan unit 2 chem for me plz along with the msc , what are ur pridiction for this paper , i mean june .. harder or easier ?

It will be the most devious paper ever designed

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Reply 385

scientific222

I expect a fairly hard paper with medium to high grade boundaries. Though judging that the same batch that sat the Unit 1 Jan 2013 paper will most likely be AS students sitting this paper (A was 53), the grade boundaries could be low

Reply 386

Gnome :)

Original post by Mimi85

yo guys , can someone please post the 2013 jan unit 2 chem for me plz along with the msc , what are ur pridiction for this paper , i mean june .. harder or easier ?

I'm fairly sure someone has already posted it today...

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Reply 387

Mimi85

Original post by Goods

It will be the most devious paper ever designed

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lol , im so scared , i didnt start yet as i was busy with physics , im hoping theyd be extra nice and make a good paper :

Reply 388

Goods

Original post by Mimi85

lol , im so scared , i didnt start yet as i was busy with physics , im hoping theyd be extra nice and make a good paper :

I have physics the day after :s I hope fibre optics don't come up I hate diffraction questions

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Reply 389

Mimi85

Original post by Gnome :)

I'm fairly sure someone has already posted it today...

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ugh , not bothered to search each page, can u plzpost it if u have it :colondollar:

Reply 390

Mimi85

Original post by Goods

I have physics the day after :s I hope fibre optics don't come up I hate diffraction questions

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oh god , same ,i also hate polorisation shizzz, im notdone with past papers and im gonna start chem like today

Reply 391

Mimi85

Original post by Goods

I have physics the day after :s I hope fibre optics don't come up I hate diffraction questions

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and btw , di u sit for unit 1 phy ? How was it if u did ? It was horrible for me , it was a resit for me btw :rolleyes:

Reply 392

Goods

Original post by Mimi85

and btw , di u sit for unit 1 phy ? How was it if u did ? It was horrible for me , it was a resit for me btw :rolleyes:

I missed up the oscilloscope and a few electricity bits but I think I did quite well. I didn't really like the 6 marker

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Reply 393

Locked_box

Do we need to know, step by step how to purify organic liquids?

Reply 394

Goods

Original post by Locked_box

Do we need to know, step by step how to purify organic liquids?

Add anhydrous sodium sulfate in excess filter into separating funnel allow layers to form drain off layers separately that's the procedure we need to know

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Reply 395

Baraf

Q10 Jan 2013

I know it isn't A or B, but I am confused about what they mean by Reducing power and Oxidizing power

Reply 396

Locked_box

Original post by Goods

Add anhydrous sodium sulfate in excess filter into separating funnel allow layers to form drain off layers separately that's the procedure we need to know

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Ok, cool beans.

So nothing else, nothing more in detail like filtering through glass wool or redistilling it at the end or using sodium hydrogen carbonate to wash the liquid?

Reply 397

Goods

Original post by Locked_box

Ok, cool beans.

So nothing else, nothing more in detail like filtering through glass wool or redistilling it at the end or using sodium hydrogen carbonate to wash the liquid?

Possibly but I don't know what adding baking powder to an organic liquid does?

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Reply 398

Locked_box

Original post by Goods

Possibly but I don't know what adding baking powder to an organic liquid does?

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I think it is used to react with any residues/contaminants

Reply 399

Jayqwe

Original post by Mimi85

yo guys , can someone please post the 2013 jan unit 2 chem for me plz along with the msc , what are ur pridiction for this paper , i mean june .. harder or easier ?