Take our quiz to find out what your revision personality is! >>

AQA GCSE Chemistry - C2 and C3 15th May

Scroll to see replies

pls the titration was 0.2288 and the moles was -486kJ can we stop saying other results please for the love of god :frown:

Reply 1001

adallar01

What did you guys put for the nanoscience question about the link between the nanoparticles and the % bacteria killed? - Also does anyone know why nanotubes are good for lubricats ?;] Thanks!

Reply 1002

Kirankhalsa

Ooh and that question about why glass lowers the melting point??

Reply 1003

CurleysWife

In the B2 exam, what did you guys put for the reason that the substances spread in the column? I put because they have different retention times and dissolve at different rates... is that right?

Also for the three conclusions one on paper chromatography, I put that cola and fruit drink had one food colouring the same, cola had (forgot number, 3?) food colourings, fruit drink had (4?) food colourings... is that right?

EDIT: C2... wow lol.

(edited 9 years ago)

Reply 1004

interstitial

Original post by adallar01

What did you guys put for the nanoscience question about the link between the nanoparticles and the % bacteria killed? - Also does anyone know why nanotubes are good for lubricats ?;] Thanks!

Smaller nanoparticles kill more bacteria
Type 1 is more resistant

No idea, I just BSed about how the layers can slide over each other as they are not bonded, reducing friction :s-smilie:

I know it was only one layer, but i couldn't think of anything else xD

Posted from TSR Mobile

Reply 1005

adallar01

Original post by Joshua697

Would filtration be ok for the first C3 question? And in C2 for the percentage yield question I put not all the reactants may have reacted, would that be accepted??

I've put because the reaction is reversible ;x I'm not sure too, let's hope for the best! :] :smile:

Reply 1006

micycle

Original post by CurleysWife

In the B2 exam, what did you guys put for the reason that the substances spread in the column? I put because they have different retention times and dissolve at different rates... is that right?

IDK; I put the gases travel at different speeds.

Reply 1007

Betanick

You lot are the most stupid bunch of duckers ive ever heard. You best get the duck of here and revise for your physics

Reply 1008

interstitial

Original post by micycle

IDK; I put the gases travel at different speeds.

Put this as well, was only 1 mark IIRC so it can't have needed that much (remember doing that Q in a past paper as well :tongue:

)

Posted from TSR Mobile

Reply 1009

adallar01

Original post by Joshua697

Would filtration be ok for the first C3 question? And in C2 for the percentage yield question I put not all the reactants may have reacted, would that be accepted??

I've put the reaction is reversible ;x I'm not sure too, let's hope for the best! :] :smile:

Reply 1010

jjsnyder

Original post by majmuh24

Smaller nanoparticles kill more bacteria
Type 1 is more resistant

No idea, I just BSed about how the layers can slide over each other as they are not bonded, reducing friction :s-smilie:

I know it was only one layer, but i couldn't think of anything else xD

Posted from TSR Mobile

Yeah I put similar to this, but type 1 was less resistant as a higher percentage of it got killed with the nano-particles... I think :/

Reply 1011

CurleysWife

Original post by majmuh24

Smaller nanoparticles kill more bacteria
Type 1 is more resistant

No idea, I just BSed about how the layers can slide over each other as they are not bonded, reducing friction :s-smilie:

I know it was only one layer, but i couldn't think of anything else xD

Posted from TSR Mobile

That's exactly what I put for the bacteria question, literally exact same lol.

The nanotube lubricant one confused me, it only had one layer, so I just mentioned about only 3 covalent bonds, much like graphite, and graphite is slippery, therefore the nanotube is... lol!

Reply 1012

sayumaya

I said that the compounds have different levels of attraction to substances in the column, and so some have different retention times as they are more/less attracted to the materials.

Reply 1013

CurleysWife

Original post by sayumaya

I said that the compounds have different levels of attraction to substances in the column, and so some have different retention times as they are more/less attracted to the materials.

What about the three conclusions?, paper chromotography

Reply 1014

MATHSPOW!!

Here's a list of All questions and the marks... 99.9% sure these are completely correct haha :smile:

(edited 9 years ago)

image.jpg127.3KB

Reply 1015

FS97

Sorry to burst everyone's bubble but the titration question was for sure 0.2288.

The way the question asked it made it look like the concentration was for the acid when in fact it was for the Sodium Hydroxide which is where a lot of people slipped up...