How was chemistry paper 23?

[Patterson]

How did you guys find it? Expected GT? Discussion/answers of the difficult questions and can someone post the answers of the calculations question.

 

[dadufahad]

heyy what did u get for the equilibrium qs?i thnk i screwed that up

 

[dadufahad]

How did you guys find it? Expected GT? Discussion/answers of the difficult questions and can someone post the answers of the calculations question.

and hw was the paper?for me it was not bad..hopefully above 40

 

[Patterson]

Are you from Malaysia like me too?

 

[roneyms]

I am from Brunei. According my classmates the equlibrium. quest the answer is x=1/15 so final=no.of moles-1/15

The mass of CO2 was 12,000,000 tonnes

Last part about the car distance. 1.39x10^11

God bless

 

[DominicD]

x is 1/15, but they asked for moles of all the reactants and products. So reactants = (4-1/15) mol, products = (2+1/15) mol.

mass of CO2 by population = 1.20 x 10^7 tonnes.
last part = 1.39 x 10^11 km.

What did you guys wrote for the colour changes for the organic part?

Rather easy, this paper.

 

[dadufahad]

Are you from Malaysia like me too?

i am from singapore

 

[dadufahad]

x is 1/15, but they asked for moles of all the reactants and products. So reactants = (4-1/15) mol, products = (2+1/15) mol.

mass of CO2 by population = 1.20 x 10^7 tonnes.
last part = 1.39 x 10^11 km.

What did you guys wrote for the colour changes for the organic part?

Rather easy, this paper.

i jus got the kmn04 one..

 

[DominicD]

I wrote everything colourless to colourless, except for KMnO4, purple to colourless and the K2Cr2O7, orange to orange.

 

[Yeongson522]

I only got one colour change for G that is purple to colourless. Anyone with me?

 

[DominicD]

Yes, there's only one solution that actually changed colour, but if you look at this paper, question 4, part b :
http://olevel.sourceforge.net/papers/9701/9701_s12_qp_21.pdf

The answer given is actually colourless to colourless, and purple to colourless.
So, I wrote the colour for all the reactions, whether they actually changed colour, or not.

 

[Yeongson522]

K thanks DominicD