Physics, Chemistry and Biology: Post your doubts here!

[Iridescent]

Hey in my notebook i rote 200 atmospheres in contact process...
is this correct?
in my book it's written 1 atm?
Pleasse help! :/

It is 2 atm. pressure in contact process.
and 200 atm. pressure in haber process.

 

[Reddah Nadeem]

It is 2 atm. pressure in contact process.
and 200 atm. pressure in haber process.

But in my book its written 1 atm?

 

[Iridescent]

But in my book its written 1 atm?

Which book is that?

 

[Iridescent]

But in my book its written 1 atm?

Actually, you can write both 1 and 2 because its in between the 1atm. pressure and 2 atm. pressure.

 

[ZaqZainab]

Best of Luck for your Exam everyone

 

[Iridescent]

Best of Luck for your Exam everyone

Best of luck to you too.

 

[Reddah Nadeem]

Best of Luck for your Exam everyone

Best Of Luck To You Too..

 

[cookies&cream]

but for question 1, d answer is A... even 1 thought the answer was C
The answer for question 2 is also A...so u r correct there!
All the answers for question 7 r correct.. but i wanted to ask for part 7(c), that why r the no. of moles same for Fe ions and the hydrated salt? Is it always same? How do v know when it is same?
anyways thnks for ur help!!

haha weird o.o
Well anyway, the equation in question 7 is ionic, so compounds were crossed out and stuff, cuz that's how we make an ionic equation, right?
Before crossing, the whole salt was there, but then parts were crossed out leaving Fe ions. No. of moles are the same because mole ratios are unchanged.
You're welcome and good luck

 

[ZaqZainab]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_11.pdf
plzz help me wd question no.6 ..i just can't understand it!!

 

[FreeMc]

hay I got a ques,I have phy ppr 1 on 5th june,until then I dont have any exam,so should I just go through past pprs,1 or 2 per day, or study also from the book?

 

[ZaqZainab]

hay I got a ques,I have phy ppr 1 on 5th june,until then I dont have any exam,so should I just go through past pprs,1 or 2 per day, or study also from the book?

do past papers know where your weakness is and then study that specific topic!

 

[CVB15]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_11.pdf
plzz help me wd question no.6 ..i just can't understand it!!

weight change= 3.0N-1.2N= 1.8N
No. of discs changed= 8-2= 6
if F=kx in this case, 1.8N=6k
take k to be the weight of one disc, so 1.8/6= 0.3N
Hope this cleared your doubt

 

[somasilver]

hi xtreme papers there is papers but it is not opening at all.all the things is opening.even community is working.but i dont know why papers is not working at all.
i donot know why

 

[ZaqZainab]

hi xtreme papers there is papers but it is not opening at all.all the things is opening.even community is working.but i dont know why papers is not working at all.
i donot know why

try freeexampapers.com this site goes crazy some times >.< in the middle of boards >.<

 

[sourov97]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_11.pdf
plzz help me wd question no.6 ..i just can't understand it!!

is the answer B!???...i got it by first finding the weight of the six removed discs...3 - 1.2 and then divided it by 6...which is 0.3..

 

[ZaqZainab]

is the answer B!???...i got it by first finding the weight of the six removed discs...3 - 1.2 and then divided it by 6...which is 0.3..

somebody helped me anyways thanks yeah the answer was B you can't be wrong

 

[sourov97]

somebody helped me anyways thanks yeah the answer was B you can't be wrong

y i cant be wrong!

 

[ZaqZainab]

y i cant be wrong!

nope

 

[ZaqZainab]

what would be the answer any why?

 

[sourov97]

what would be the answer any why?

should be C...cause only it has both clockwise and anti clockwise moments ...in A..it is both anti clockwise!