Chrmistry Paper 1 IGCSE oct/nov 13 Discussion + Poll

[qasimnisar2121]

Title says it all!! i m sure no one would have doubts!!

 

[kh.usama]

what did u guys write for the one about concentrated NaCl and litmus solution electrolysis?

 

[qasimnisar2121]

what did u guys write for the one about concentrated NaCl and litmus solution electrolysis?

i am not sure what the que was.... can u please explain a little bit more of the que, what it was?

 

[Hamzeh S]

i am not sure what the que was.... can u please explain a little bit more of the que, what it was?

the question about electrolysis of Concentrated NaCl and the color of litmus paper at each electrode i think it was C
Red at the anode and colorless at the cathode

 

[qasimnisar2121]

the question about electrolysis of Concentrated NaCl and the color of litmus paper at each electrode i think it was C
Red at the anode and colorless at the cathode

OMG... I guess u effed it up!! chlorine forms at anode so colourless at ANODE but BLUE color at cathode

 

[qasimnisar2121]

Alla' Abu-Sultaneh SarahCh8 what marks u guys expect?

 

[kh.usama]

the question about electrolysis of Concentrated NaCl and the color of litmus paper at each electrode i think it was C
Red at the anode and colorless at the cathode

oohhh sorry bro u made a mistake.. qasimnisar is right i think

 

[kh.usama]

OMG... I guess u effed it up!! chlorine forms at anode so colourless at ANODE but BLUE color at cathode

though that is the answer i chose, i did not understand why.. what makes the cathode area blue?

 

[Hamzeh S]

OMG... I guess u effed it up!! chlorine forms at anode so colourless at ANODE but BLUE color at cathode

The question was about the color of the litmus paper not the color of the gas so it was blue at the anode since chlorine turns damp red litmus paper blue after it bleaches and colorless at the cathode because hydrogen forms so no change

 

[kh.usama]

The question was about the color of the litmus paper not the color of the gas so it was blue at the anode since chlorine turns damp red litmus paper blue after it bleaches and colorless at the cathode because hydrogen forms so no change

but chlorine does not turn damp litmus paper blue :/ it de-colorizes it

 

[Hamzeh S]

but chlorine does not turn damp litmus paper blue :/ it de-colorizes it

 

[Hamzeh S]

Guys which reaction doesnt produce co2? Some people wrote femrmentation but I check and it does produce co2 what did u choose?

 

[kh.usama]

Guys which reaction doesnt produce co2? Some people wrote femrmentation but I check and it does produce co2 what did u choose?

was this the one with combustion of hydrogen? if so.. i chose the one with hydrogen

 

[kh.usama]

nevertheless, in the end it does get decolorized

 

[SarahCh8]

The electrolysis one was COLORLESS at ANODE & BLUE at CATHODE.
And for where CO2 is not produced was HEATING OF LIME.




Can anyone tell me what was question 3 answer, about chromatography thingy about X & Y?
And which pollunt air is NOT formed while buring coal in power stations?
And which metal was it that had something like 1410 melting point & it's most of compound are green?

 

[22shimmer22girly]

The electrolysis one was COLORLESS at ANODE & BLUE at CATHODE.
And for where CO2 is not produced was HEATING OF LIME.




Can anyone tell me what was question 3 answer, about chromatography thingy about X & Y?
And which pollunt air is NOT formed while buring coal in power stations?
And which metal was it that had something like 1410 melting point & it's most of compound are green?

Yes for X & Y this is a repeated question ( check october/november 2008 Question 4) the correct answer is A.

for the metal i got nickel which is the correct answer...

 

[kh.usama]

The electrolysis one was COLORLESS at ANODE & BLUE at CATHODE.
And for where CO2 is not produced was HEATING OF LIME.




Can anyone tell me what was question 3 answer, about chromatography thingy about X & Y?
And which pollunt air is NOT formed while buring coal in power stations?
And which metal was it that had something like 1410 melting point & it's most of compound are green?

i chose nitrogen dioxide not 100% sure its correct though..

 

[SarahCh8]

22shimmer22girly- Same, here I wrote nickel.
kh.usama- Yuss, I wrote nitrogen dioxide too.

 

[Skyfall19]

the question about electrolysis of Concentrated NaCl and the color of litmus paper at each electrode i think it was C
Red at the anode and colorless at the cathode

It was D it has came in a past papers prolly mayjune 2009 papr 1 :0