Chemistry ATP

[Soulgamer]

I don't think you should extrapolate the graph to the origin I don't think many people from my center did that lol
What was the concentration btw?

The last part? 1.25 mol/dm^3

 

[intelnehalem]

I don't think you should extrapolate the graph to the origin I don't think many people from my center did that lol
What was the concentration btw?

The last part? 1.25 mol/dm^3

yeah!

 

[Soulgamer]

Intel the moles one....what was the last answer?

 

[mehdi1028]

As stated in the mark schemes, We had to extend the line at lower and upper ends... but I didn't..
There is 1 mark for this.. :sorry:

 

[iFuz]

awww.... it would be good just have trust in Allah as what we could do we did now upon Him!! @Maleeha @workaholic

 

[Maleeha]

yeah.. itx all we can do now..

 

[pdropper]

in the elctrolysis, was the gas formed hydrogen or oxygen? moreover, what was the colour change in the titration question? sumone plzz answer them.

 

[Rampag3r]

Oxygen, as OH ions discharge.
Green to pink.
Or colourless to pink.

 

[insomniac]

em also confused about the gas ... plzz someone confirm it with a reason .. so we shall nt mess our chem p1 n p2

 

[Rampag3r]

OH ions were discharged as Suplhate ions are never discharged in aqueous solution. The question specifically asked about gas at anode, which could only be where OH ions are discharged.
4OH^- ===> 2H20 + O2 + 4e^-.
Oxygen gas given off.
Hope this clears it up!

 

[Usman17]

Its common sense to start the graph from the origin...
And yeah soulgamer last parts answer was 1.25 mol per dm3...

 

[Maleeha]

no itx not "common sense" most of the tyms marks r deducted for forcing line to pass through origin.. n if it had been so obvious.. everyone wud have had done it correct.

 

[Soulgamer]

No marks are deducted if graph is not started from origin unless asked to do so.

 

[Usman17]

Marks are deducted...!! You have to xtend in both directions as my sir told me...!! cant start the graph from the mid...

 

[izzahzainab]

well its common sense that no gas would be collected if you mix 10 cm3 of HCl and NO OTHER reagant

 

[ultraviolet]

Hey, Umm i did the last part with pencil nd its rite,will they check it? :/

 

[4hsan786]

Hey guys what was the answer to that 1000g question in the last part of titration?

 

[Soulgamer]

688- 692 something like that.

 

[4hsan786]

Yes. Mine was 692g.

 

[dumpichki]

guys does anyone remember answers to q2...the electrolysis one..please?