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Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 253811 times)

Offline The Golden Girl =D

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #795 on: March 18, 2011, 06:59:13 pm »
Incomplete combustion -> CO and water as well as carbon soot

carbon soot is for ANY type of combustion ;)

Based on my knowledge.
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #796 on: March 18, 2011, 07:50:07 pm »
Quote from: The Secret on March 18, 2011, 06:57:14 pm
Okay, thank you! :)

May I just confirm one more thing?

The products of incomplete combustion, I recall from IG's that it was carbon monoxide and water, but in my edexcel AS chemistry textbook, it says carbon [soot], carbondioxide and carbonmonoxide, so which one is right?

Both of them are right. Incomplete combustion can produce Soot, or Carbon (C). Carbon Dioxide. Carbon Monoxide (our poisonous gas) and water vapour

 C2H2 (g) + O2 (g) --> H2O (g) + CO2 (g) + CO (g) + C (s) This is the incomplete combustion of acetylene.


Quote from: ~ The Golden Girl ~ on March 18, 2011, 06:59:13 pm
Incomplete combustion -> CO and water as well as carbon soot

carbon soot is for ANY type of combustion ;)

Based on my knowledge.

()

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elemis

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #797 on: March 19, 2011, 03:45:21 am »
Quote from: ~ The Golden Girl ~ on March 18, 2011, 06:59:13 pm
Incomplete combustion -> CO and water as well as carbon soot

carbon soot is for ANY type of combustion ;)

Based on my knowledge.

However, the primary product is CO NOT CO2. CO2 is formed but in very minute quantities.
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Offline Deadly_king

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #798 on: March 19, 2011, 01:54:38 pm »
Quote from: The Secret on March 18, 2011, 06:57:14 pm
Okay, thank you! :)

May I just confirm one more thing?

The products of incomplete combustion, I recall from IG's that it was carbon monoxide and water, but in my edexcel AS chemistry textbook, it says carbon [soot], carbondioxide and carbonmonoxide, so which one is right?

All three of them are correct. ;)

You can never say a reaction is altogether incomplete. That's why all three products can be present. Soot(carbon) is present since some of it has not combusted yet..............some have been converted to carbon monoxide only while others have already been converted to carbon dioxide. :D
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #799 on: March 21, 2011, 11:19:39 am »
plz explain why it is not D
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elemis

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #800 on: March 21, 2011, 01:46:12 pm »
Quote from: Relina on March 21, 2011, 11:19:39 am
plz explain why it is not D

The prefix Z is used to denote a CIS molecule.

In this case it is a TRANS Geometric isomer thus, the prefix E is used i.e. E 2-chlorobut-2-ene
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #801 on: March 21, 2011, 02:05:10 pm »
Quote from: Ari Ben Canaan on March 21, 2011, 01:46:12 pm
The prefix Z is used to denote a CIS molecule.

In this case it is a TRANS Geometric isomer thus, the prefix E is used i.e. E 2-chlorobut-2-ene
well how come ???
u know here there is chlorine so we could not use the cis-trans model so we must use the E-Z model and if we use it it would be D as clorine has higher priority than ccarbon and methyl group and in ''up'' position while hyrogen due to its lower atomic no. has lower priority to carbon and methyl group so higher priority groups are in ''up'' postion so both higher priority groups are in ''up''position so z-2-chloro bute-2-ene???
are u convinced or not yet??
« Last Edit: March 21, 2011, 02:07:29 pm by Relina »
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Offline Amii

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #802 on: March 21, 2011, 05:45:12 pm »
Quote from: Relina on March 21, 2011, 02:05:10 pm
well how come ???
u know here there is chlorine so we could not use the cis-trans model so we must use the E-Z model and if we use it it would be D as clorine has higher priority than ccarbon and methyl group and in ''up'' position while hyrogen due to its lower atomic no. has lower priority to carbon and methyl group so higher priority groups are in ''up'' postion so both higher priority groups are in ''up''position so z-2-chloro bute-2-ene???
are u convinced or not yet??

You are right.It should be D.Even in my text book this structure has a name Z-2-chlorobut-2-ene.

The answer C has to be wrong.  :-\
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #803 on: March 21, 2011, 09:00:33 pm »
Quote from: Amii on March 21, 2011, 05:45:12 pm
You are right.It should be D.Even in my text book this structure has a name Z-2-chlorobut-2-ene.

The answer C has to be wrong.  :-\
oh Thanks dear for ur reply, but which textbook is that i'm really curios about it  ;)
and i'll still wait for Ari Ben Canaan  reply so that i would like to know his reasons for choosing  that answer D. :)
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Offline Amii

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #804 on: March 21, 2011, 10:08:27 pm »
Quote from: Relina on March 21, 2011, 09:00:33 pm
oh Thanks dear for ur reply, but which textbook is that i'm really curios about it  ;)
and i'll still wait for Ari Ben Canaan  reply so that i would like to know his reasons for choosing  that answer D. :)

No problem

George Facer AS Chemistry

Take care  :D
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elemis

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #805 on: March 22, 2011, 02:31:32 pm »
Quote from: Relina on March 21, 2011, 02:05:10 pm
well how come ???
u know here there is chlorine so we could not use the cis-trans model so we must use the E-Z model and if we use it it would be D as clorine has higher priority than ccarbon and methyl group and in ''up'' position while hyrogen due to its lower atomic no. has lower priority to carbon and methyl group so higher priority groups are in ''up'' postion so both higher priority groups are in ''up''position so z-2-chloro bute-2-ene???
are u convinced or not yet??


YIKES !! My bad. You're correct.
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #806 on: March 22, 2011, 02:33:48 pm »
Quote from: Amii on March 21, 2011, 10:08:27 pm
No problem

George Facer AS Chemistry

Take care  :D
omg that a good book i think i am really feeling totally confused who is right??
 
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #807 on: March 22, 2011, 02:34:31 pm »
aah I have another question about choosing the titres to get the mean titre  what do u depend on to choose ??? and if the burrete uncertainty is +/_ 0.05 so what would be the actual vale between if we have for example 14.85 cm3 my techer told me it would be between (14.75cm3 & 14.95cm3)  but my answer was (14.80cm3 &14.90cm3) so help me with that issue plz
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Offline Amii

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #808 on: March 22, 2011, 04:42:27 pm »
Quote from: Relina on March 22, 2011, 02:34:31 pm
aah I have another question about choosing the titres to get the mean titre  what do u depend on to choose ??? and if the burrete uncertainty is +/_ 0.05 so what would be the actual vale between if we have for example 14.85 cm3 my techer told me it would be between (14.75cm3 & 14.95cm3)  but my answer was (14.80cm3 &14.90cm3) so help me with that issue plz
Error for each reading = +/-0.05cm3
Error in the titre = +/- 0.1 cm3 (0.05X2)

14.85 + 0.1 =14.95 cm3
14.85 - 0.1 =14.75 cm3

 :D
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #809 on: March 23, 2011, 11:37:25 am »
Quote from: Amii on March 22, 2011, 04:42:27 pm
Error for each reading = +/-0.05cm3
Error in the titre = +/- 0.1 cm3 (0.05X2)

14.85 + 0.1 =14.95 cm3
14.85 - 0.1 =14.75 cm3

 :D
is this is a standard used for any example like that ???
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