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Edexcel Chemistry AS Unit 2- 16th January 2013

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Reply 80
Avatar for Exams v__v
Exams v__v
Original post by david tennant
does anyone know what the first step for the formation of no radicals is, the george facer book does't give it...


no2 ---> no* + o* ?
Original post by David Tennant
Does anyone know what the first step for the formation of NO radicals is, the George Facer book does't give it...


Which bit do we need that for?
Reply 82
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David Tennant
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Original post by Weaselmoose
Which bit do we need that for?


Green chemistry :biggrin:...
Ok question guys:



Why do HFC's not break down in the stratosphere?
Reply 83
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David Tennant
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Original post by Exams v__v
no2 ---> no* + o* ?

Yeah, thanks ...
Reply 84
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jojo1995
2
Original post by David Tennant
Green chemistry :biggrin:...
Ok question guys:



Why do HFC's not break down in the stratosphere?


hi :smile:
the h means it can be oxidised ?

so cl. are not released so easily
Reply 85
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David Tennant
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Original post by jojo1995
hi :smile:
the h means it can be oxidised ?

so cl. are not released so easily

Yeah brilliant...
Reply 86
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Exams v__v
Can someone help me with Jan 2012 Mcq 16)a)? :s why not A?
Reply 87
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Exams v__v
And why are HCFCs considered better than CFCs?
Reply 88
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jojo1995
2
Original post by David Tennant
Yeah brilliant...


yay thanks :smile:
Reply 89
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jojo1995
2
Original post by Exams v__v
Can someone help me with Jan 2012 Mcq 16)a)? :s why not A?


because the equilibrium moves towards the right, but both n204 and 2no2 aRE still present, just more n202 being formed than before so the colour becomes less brown
sorry this is really muddled
Reply 90
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Exams v__v
Original post by jojo1995
because the equilibrium moves towards the right, but both n204 and 2no2 aRE still present, just more n202 being formed than before so the colour becomes less brown
sorry this is really muddled


Got it, thank you soo much! :biggrin:
But then technically, shouldn't part b be pale brown too? :s
Reply 91
Avatar for David Tennant
David Tennant
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Original post by Exams v__v
Got it, thank you soo much! :biggrin:
But then technically, shouldn't part b be pale brown too? :s


No because the forward reaction is exothermic and so when you increase the temperature, to decrease the temperature it will shift in the endothermic direction (to the left) to make it darker brown...
Reply 92
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Exams v__v
Original post by David Tennant
No because the forward reaction is exothermic and so when you increase the temperature, to decrease the temperature it will shift in the endothermic direction (to the left) to make it darker brown...


Thanks! ^^
Reply 93
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Exams v__v
What are the conditions of reacting nh3 with a halgoenoalkane?
Reply 94
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David Tennant
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Original post by Exams v__v
What are the conditions of reacting nh3 with a halgoenoalkane?


Ethanolic under reflux?
Reply 95
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Exams v__v
Original post by David Tennant
Ethanolic under reflux?


Oh sure? I read that somewhere, and somewhere else, just nh3 at rtp.
Reply 96
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Exams v__v
The redox equations for H2SO4 --> SO2 and HNO3 --> NO2? :|
good luck for tomorrow guys !!! :biggrin:
Reply 98
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David Tennant
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Original post by constandinos
good luck for tomorrow guys !!! :biggrin:


Thanks
I'll be contributing to a lower grade boundaries for you guys

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