Chemistry p52!

[rizwaan]

ok, just message me..

chk yr inbox.

 

[srijitsharma]

can anyone please tell me, how threshold might go?

 

[berry89th]

can anyone please tell me, how threshold might go?

sherpa, i think threshold will be around 20 for A?

 

[Mukit-ul Islam]

how was your graph looking for the first question? Someone please inbox me too

 

[srijitsharma]

sherpa, i think threshold will be around 20 for A?

okay, i think i will secure around 15!

 

[Nishii]

okay, i think i will secure around 15!

me too! for june 2012, the gt was 16!

 

[Nishii]

what was the answer to the first question anyone?

 

[Taci12]

For number 1, we had to reduce the lead oxides, then collect the water vapour by condensing it? This is the only way I could think of obtaining the ratio of lead to oxygen atoms :/ Usually, the first question is pretty straightforward. This time Cambridge had some fun it seems

 

[Nishii]

For number 1, we had to reduce the lead oxides, then collect the water vapour by condensing it? This is the only way I could think of obtaining the ratio of lead to oxygen atoms :/ Usually, the first question is pretty straightforward. This time Cambridge had some fun it seems

yeah you said it all. you remember the first part of the first question? the number of moles of oxygen atoms needed?

 

[Taci12]

yeah you said it all. you remember the first part of the first question? the number of moles of oxygen atoms needed?

Yes, for PbO it was 1, PbO2 it was 2, Pb3O4 was 4/3 or 1.33 i think. Just had to write the equation, and use oxygen atoms instead of o2 molecules.
How was it overall for you?

 

[Nishii]

Yes, for PbO it was 1, PbO2 it was 2, Pb3O4 was 4/3 or 1.33 i think. Just had to write the equation, and use oxygen atoms instead of o2 molecules.
How was it overall for you?

messed up the whole of question 1, question 2 was great but aint sure if my graph's correct! i got something like this :

 

[Taci12]

messed up the whole of question 1, question 2 was great but aint sure if my graph's correct! i got something like this : View attachment 18451

Graph looks good to me! Don't worry, you probably did better than you think. How did you produce your hydrogen gas?

 

[Nishii]

Graph looks good to me! Don't worry, you probably did better than you think. How did you produce your hydrogen gas?

better not ask.. i used Mg ribbon and dilute sulfuric acid .. you?

 

[Taci12]

better not ask.. i used Mg ribbon and dilute sulfuric acid .. you?

I used Mg powder and HCl in a divided flask. Well, now have physics p5 to look forward to!

 

[Nishii]

I used Mg powder and HCl in a divided flask. Well, now have physics p5 to look forward to!

good luck! i got biology, bon courage

 

[Taci12]

good luck! i got biology, bon courage

Thanks! Same to you Somehow I've got the feeling Physics p5 will be much much better : P Hope your bio paper's great too! Last few days left now

 

[Nishii]

Thanks! Same to you Somehow I've got the feeling Physics p5 will be much much better : P Hope your bio paper's great too! Last few days left now

yeah..and school life's nearly over!

 

[Taci12]

yeah..and school life's nearly over!

Yeah =/ Will miss school, but it'll certainly be fun not wearing uniforms, or listening to teachers ranting on, or following school regulations

 

[Nishii]

Yeah =/ Will miss school, but it'll certainly be fun not wearing uniforms, or listening to teachers ranting on, or following school regulations

yeah^^ the plus points outweigh the minus ones!

 

[Mukit-ul Islam]

i measured the mass before reduction and mass after reduction. This way, you'll be able to get mass of Pb and oxygen. What were your dependent and independent variable?