i think you have to cancel them out, not 100% sure , actually you do just looked at the question properly the all have a 2 in front of them so you can divide it by 2

(edited 8 years ago)

Reply 1004

AnishaJayne

When doing the 1:3:4:2 for example in nmr is this integration or splitting pattern

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Reply 1005

bladex

Praying for a nice exam :frown:

Reply 1006

bladex

Original post by AnishaJayne

When doing the 1:3:4:2 for example in nmr is this integration or splitting pattern

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Normally the integration, you normally have to figure out splitting for yourself

Reply 1007

baymax96

how do you draw a titration curve when the volume of acid and alkali added are different volumes and different concs?

Reply 1008

Wahid1

Kc=(Kc)^1/2

Help please I thought only Temp changes Kc

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Reply 1009

madmenace

This is deadly I personally don't think it will come up but calculate the equivalence point (nacid=nalkali) and also find beginning and end ph that should get most of the marks.. im not gonna stress over new stuff, just go through a few past papers and learn key definitions people!!!!!

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Reply 1010

Nautic4l

Original post by Maham88

i think you have to cancel them out, not 100% sure , actually you do just looked at the question properly the all have a 2 in front of them so you can divide it by 2

But the first product doesn't have 2 does it?

Reply 1011

rowanbarnesss

Original post by Ripper Phoenix

why isn't the entropy of system always positive for dissolving?

When dissolving group 2 ionic solids, the water molecules can become more ordered around the ions, and this outweighs the entropy increase of the ions, hence entropy of system showing an overall decrease, I think?

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Reply 1012

madmenace

Original post by Wahid1

Kc=(Kc)^1/2

Help please I thought only Temp changes Kc

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whats the question? baaanjoot :biggrin:

u better get A* fammm

Reply 1013

Maham88

Original post by Nautic4l

But the first product doesn't have 2 does it?

here

DSC_2769.jpg504.1KB

Reply 1014

Wahid1

Original post by madmenace

whats the question? baaanjoot :biggrin:

u better get A* fammm

????

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Reply 1015

Maham88

Original post by Wahid1

Kc=(Kc)^1/2

Help please I thought only Temp changes Kc

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have you got the question ?

Reply 1016

veniceswan

Original post by Nautic4l

When do you know it's a solvent..? What type of reactions?

I thought H2O is included in Kc calculation, are you talking about Ka

Reply 1017

HopefulDentist..

anyone know how to do 18cii on Jan 14 international paper? It's a one marker but I don't get it :frown:

Reply 1018

rasil23

Original post by Wahid1

Can someone please explain why when the same Kc equation has every concentration halved then Kc= (Kc)^1/2???

I thought only temp affects Kc position

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k'c is the sqr root of Kc, thats why every mol before reactant and product is square rooted.

That isnt a factor that affects kc, you should just know kc = k'c^2

Reply 1019

bladex

Original post by HopefulDentist..

anyone know how to do 18cii on Jan 14 international paper? It's a one marker but I don't get it :frown:

You know the original concentration of aqeous ammonia is 4.0 mol dm-3 and you should have worked out that 3.84 mol dm-3 of ammonia is in the aqeous layer after they've been shaken which means 0.16 mol dm-3 must have been used to form the ammonia in trichloromethane. Sorry its quite hard to explain