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Author Topic: chem doubt  (Read 1040 times)

Offline AN10

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chem doubt
« on: June 03, 2010, 03:37:19 pm »
M/J 09 chem p1 mcq no. 11...why is the ans C....why it cannot be D ( i get it A and B are not possible but am confused bw C and D)
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“Faith is taking the first step even when you don't see the whole staircase.”

nid404

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Re: chem doubt
« Reply #1 on: June 03, 2010, 03:52:31 pm »
You straight away eliminate A and B as they produce no unreactive gas (N2)
The reaction is as such

3Ba(NO3)2 + heat ? 3BaO + 6NO2 + 3O2

10Al + 3BaO + 6NO2 + 3O2---> Al2O3 + 3BaO+ 3N2

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Offline toleen

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Re: chem doubt
« Reply #2 on: June 03, 2010, 05:02:19 pm »
I NEED SITES FOR DOWNLOADING PRACTUCE SHEETS OTHER THAN THE PAST PAPERS
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Offline toleen

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Re: chem doubt
« Reply #3 on: June 03, 2010, 06:10:49 pm »
ANY 1 hELLO
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nid404

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Re: chem doubt
« Reply #4 on: June 03, 2010, 06:23:02 pm »
You can try past papers of other boards  :-\

or try this link ...it has practice sheets. http://www.a-levelchemistry.co.uk/AQA%20AS%20Chemistry/new%20AS%20Chemistry%20home.htm
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Offline leebux101

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Re: chem doubt
« Reply #5 on: June 03, 2010, 07:20:06 pm »
can someone plz tell me Q21 from MJ 02
plz!
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Offline leebux101

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Re: chem doubt
« Reply #6 on: June 03, 2010, 07:42:34 pm »
can u also help with Q5 from ON 02
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Offline toleen

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Re: chem doubt
« Reply #7 on: June 03, 2010, 07:43:48 pm »
THANKS nid404  :)
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