Qualification > Sciences
Chemistry Paper 22 3rd Nov
Deadly_king:
--- Quote from: cs on November 05, 2010, 10:57:53 am ---
I think i drew it correctly. i wrote bent cos there's lone pair(which i know- its wrong now), its okay.. but why is it linear, is it because as long as there's 2 bond pair, its linear? ignore the lone pairs? (trying to learn, paper 1 left).. :D
--- End quote ---
C=C=O
Nope, the lone pairs are found on the extreme atoms namely : oxygen and carbon on the left.
Both of them carry a double bond which are taken as one since they go in the same direction.
Hence in whichever direction the lone pairs repel the bond pairs, it won't have any effect.
However if the lone pair had been found on the carbon atom in the middle, then it would have been bent. ;)
cs:
Yes i am correct! hehe, i drew the structure out, comparing H2O and CO2, found out that the difference is the middle atom, Thank you Deadly King, i am sure you will do well in your exam.. you're so good!
Deadly_king:
--- Quote from: cs on November 05, 2010, 11:36:31 am ---Yes i am correct! hehe, i drew the structure out, comparing H2O and CO2, found out that the difference is the middle atom, Thank you Deadly King, i am sure you will do well in your exam.. you're so good!
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Hehe............glad you got it well :D
Anytime...............i really hope so :)
Hypernova:
--- Quote from: Deadly_king on November 05, 2010, 04:26:44 am ---Ooh...........I never expected this kind of question. I messed it up in the beginning but then I finally resolved it. :D
Hmm.........my answers are :
i) Oxygen - 20 cm3 has been used
ii) Carbon dioxide - 10 cm3 has been formed.
A was methane CH4
Did we have to find the Mr in that ???
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Do you remember how many marks this question was worth?
Deadly_king:
--- Quote from: Hypernova on November 06, 2010, 11:37:38 am ---Do you remember how many marks this question was worth?
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Hmm...........can't remember exactly.
But I guess the whole number should have been 5 marks.
Why are you asking?
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