Incomplete Combustion

lili.bykerk · 31 Oct 2009, 7:15 PM

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What's the go with incomplete combustion? When I learnt it in class I was told the products are CO2 and CO, but then after doing questions from the success one book and looking in the answers the product is only CO?

Which one is actually correct cause its doing my head in right now!!!

I'd also appreciate if anyone can answer my other questions on this thread: http://community.boredofstudies.org/...hsc-paper.html

mrhorseham · 31 Oct 2009, 7:19 PM

just answered the question on other thread

Complete Combustion ur products will be CO2 and H2O

Incomplete Combustion your products could be any or all of these:
-C (soot)
-CO
-CO2
-H2O

sometimes u may not get C, other times u may

lili.bykerk · 31 Oct 2009, 7:41 PM

Quote:

Originally Posted by mrhorseham

just answered the question on other thread

Complete Combustion ur products will be CO2 and H2O

Incomplete Combustion your products could be any or all of these:
-C (soot)
-CO
-CO2
-H2O

sometimes u may not get C, other times u may

So how would you know which equation to write for incomplete combustion if you could get any or all of the above products? E.g. question from HSC 2005 Q23. (b) Write a balanced equation for the incomplete combustion of methane.

The answer given in the success one book is 2CH4 + 3O2 --> 2CO + 4H2O . how would you know that CO is being released and not C or CO2 aswell? I know CO2 is for complete combustion but it is also released for incomplete combustion; this is what confuses me... If we're not told soot formed on the bottom of the beaker or anything, how are we supposed to know if the equation we write down is correct?

fayad158 · 31 Oct 2009, 7:42 PM

Quote:

Originally Posted by mrhorseham

just answered the question on other thread

Complete Combustion ur products will be CO2 and H2O

Incomplete Combustion your products could be any or all of these:
-C (soot)
-CO
-CO2
-H2O

sometimes u may not get C, other times u may

for example the combustion of methane

complete
ch4 + 202 = co2 + 2h2o

incomplete
ch4 + 3/2 o2 = co + 2h2o
and
ch4 + 02 = c + 2h2o

mrhorseham · 31 Oct 2009, 7:45 PM

if the question does not so (like you said) that soot is formed...then the hsc examiners will have to accept all possible incomplete eqns

hermand · 31 Oct 2009, 7:48 PM

you don't put co2 in because co2 indicates complete combustion, and all the co2 produced will come from complete combustion.

as mrhorseham said, it's either CO or C. and they'd accept either unless specifics about soot were given.

lili.bykerk · 31 Oct 2009, 7:51 PM

Quote:

Originally Posted by hermand

you don't put co2 in because co2 indicates complete combustion, and all the co2 produced will come from complete combustion.

as mrhorseham said, it's either CO or C. and they'd accept either unless specifics about soot were given.

Sweet as. Thanks for clearing that up everyone

and GOOD LUCK FOR MONDAY!!!

4lettersdown · 1 Nov 2009, 6:21 PM

incomplete combustion is pretty random in its products, it varies. as long as it balances out, just bung in CO or C

nosh22 · 1 Nov 2009, 7:00 PM

The products vary on the fuel to air ratio. For example for octane:
Good fuel to air ratio: O8H18 + O2 -> CO2 + H20
Insufficent air: O8H18 + O2 -> CO + H20
Even less oxygen: O8H18 + O2 -> C + H20

Cbf balancing.

31 Oct 2009, 7:15 PM	#1 (permalink)
lili.bykerk Lils1991 HSC: 2009 Gender: Female Join Date: Jun 2008 Posts: 9 Last Activity: 19 Nov 2009, 10:20 AM	Incomplete Combustion You can hide this advertisement by registering. What's the go with incomplete combustion? When I learnt it in class I was told the products are CO2 and CO, but then after doing questions from the success one book and looking in the answers the product is only CO? Which one is actually correct cause its doing my head in right now!!! I'd also appreciate if anyone can answer my other questions on this thread: http://community.boredofstudies.org/...hsc-paper.html

31 Oct 2009, 7:19 PM	#2 (permalink)
mrhorseham Junior Member HSC: 2009 Gender: Male Join Date: Oct 2009 Posts: 27 Last Activity: 18 Dec 2009, 1:37 PM	Re: Incomplete Combustion just answered the question on other thread Complete Combustion ur products will be CO2 and H2O Incomplete Combustion your products could be any or all of these: -C (soot) -CO -CO2 -H2O sometimes u may not get C, other times u may

31 Oct 2009, 7:45 PM	#5 (permalink)
mrhorseham Junior Member HSC: 2009 Gender: Male Join Date: Oct 2009 Posts: 27 Last Activity: 18 Dec 2009, 1:37 PM	Re: Incomplete Combustion if the question does not so (like you said) that soot is formed...then the hsc examiners will have to accept all possible incomplete eqns

31 Oct 2009, 7:48 PM	#6 (permalink)
hermand je t'aime. HSC: 2009 Gender: Female Join Date: Aug 2008 Posts: 1,380 Last Activity: 27 Feb 2010, 11:57 PM	Re: Incomplete Combustion you don't put co2 in because co2 indicates complete combustion, and all the co2 produced will come from complete combustion. as mrhorseham said, it's either CO or C. and they'd accept either unless specifics about soot were given. __________________ bachelor of science at usyd. 2o1o bachelor of pharmacy at usyd. 2o11 i wish i did the stat test .

1 Nov 2009, 7:00 PM	#9 (permalink)
nosh22 Assistant Member HSC: 2009 Gender: Female Join Date: Mar 2009 Posts: 85 Last Activity: 13 Mar 2010, 8:23 PM	Re: Incomplete Combustion The products vary on the fuel to air ratio. For example for octane: Good fuel to air ratio: O8H18 + O2 -> CO2 + H20 Insufficent air: O8H18 + O2 -> CO + H20 Even less oxygen: O8H18 + O2 -> C + H20 Cbf balancing.

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