Edexcel chemistry - unit 2 19th january 2012

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Why do we use damp litmus paper again? Can't find my notes

its damp to ensure that the gas molecules can stick to the paper (and hence change the colour of the limtus paper)

i highly doubt they will ask that but it's worth remembering

Reply 381

Alpha-Omega

Original post by James A

its damp to ensure that the gas molecules can stick to the paper (and hence change the colour of the limtus paper)

i highly doubt they will ask that but it's worth remembering

Ah yeah, that reminds me of why damp red phosphorus is used too to react with iodine to make PI₃.

Reply 382

wam-bam

Original post by James A

its damp to ensure that the gas molecules can stick to the paper (and hence change the colour of the limtus paper)

i highly doubt they will ask that but it's worth remembering

QUICK Q:

what colour is methyl orange in acid & alkali???

(just to double check phenolpthalein is colourless in acid and pink in alkali right?)

Reply 383

GraemeLawd

I really hope section C is all on equilibrium, it or the breakdown on the O-zone layer both a lot of marks for quite simple stuff!

Reply 384

Alpha-Omega

Original post by wam-bam

QUICK Q:

what colour is methyl orange in acid & alkali???

(just to double check phenolpthalein is colourless in acid and pink in alkali right?)

Methyl Orange
Acid: Red
Base: Yellow
End-point Colour: Orange

Phenolphthalein
Acid: Colourless
Base: Purple
End-point Colour: Pink

Reply 385

Alpha-Omega

Original post by GraemeLawd

I really hope section C is all on equilibrium, it or the breakdown on the O-zone layer both a lot of marks for quite simple stuff!

I agree.

Reply 386

wam-bam

Original post by Alpha-Omega

Methyl Orange
Acid: Red
Base: Yellow
End-point Colour: Orange

Phenolphthalein
Acid: Colourless
Base: Purple
End-point Colour: Pink

Thank you very much
&
GOOD LUCK!

Reply 387

wam-bam

Original post by wam-bam

even though i don't think you'll need it :tongue:

Reply 388

F1's Finest

good luck guys, im gonna leave to travel to school now. i should arrive there by half 1, discuss things about the paper with mates in my class, then do the paper!

No exam discussion please! (after the exam until 4am the next day)

Reply 389

cisne

Original post by James A

your not supposed to learn all those definitions. for unit 1 yes, but not unit 2. only from here you need to know the trends and the gas colours

yes,but i wrote it for understanding...if you dont know the meaning of a term correctly it wont be easy to understand the question...right??

Reply 390

NutterFrutter

No discussion until 4:30 AM. :sad:

Reply 391

This Honest

Original post by NutterFrutter

No discussion until 4:30 AM. :sad:

The wait is long

Reply 392

GraemeLawd

Original post by Silkysam

I didn't like this paper at all. The questions were weird. I'm so disappointed as I was getting 90%+ on all my past papers and then this one I reckon I'll be lucky to get an A.

Anyone else notice a lack of questions on kinetics and equlibria?

Yes! Kinetics and equlibria are pretty easy topics but worth a lot of marks usually but not having anything really on either was fairly annoying. Was a strange paper.