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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: Zahta on April 21, 2012, 03:54:21 pm

Title: Just a quick help on a question :)
Post by: Zahta on April 21, 2012, 03:54:21 pm

Oh okay im having trouble with questions

Write  a balanced equation , including subscripts, for the combustion of ethanol  in a good air  supply ? okay  i dont get when its says good air supply  and i write etanol as  CH3CHOHCH2 but but the book writes it as C2H5OH(l).  So how do i write these kind of equations . that say a good air supply of e.g carbon monoxide


I would really appreciate  any help thank you :)

Title: Re: Just a quick help on a question :)
Post by: DisaFear on April 21, 2012, 04:11:10 pm

(http://www.charcoalproject.org/wp-content/uploads/2010/12/Ethanol-11.gif)

That happens to be ethanol, the thing that your book writes it as. The thing you believe to be ethanol, "CH3CHOHCH2", is actually no-clue-what *shrugs*. It has three carbons, so it cannot be ethanol. It is also missing a hydrogen (double bond?)

This?
(http://i.imgur.com/qh7jI.jpg)

By good supply of air, I'm assuming it undergoes complete combustion

This here would be your answer.

Title: Re: Just a quick help on a question :)
Post by: Zahta on April 21, 2012, 04:41:41 pm

thank you  i think i did the semi structural formula

Title: Re: Just a quick help on a question :)
Post by: DisaFear on April 21, 2012, 04:47:36 pm

Quote from: Zahta on April 21, 2012, 04:41:41 pm

thank you  i think i did the semi structural formula

Semi-structural formula of what? There's a whole carbon difference between...

Quote from: Zahta on April 21, 2012, 03:54:21 pm

and i write etanol as  CH3CHOHCH2 but but the book writes it as C2H5OH(l). 

Title: Re: Just a quick help on a question :)
Post by: Zahta on April 21, 2012, 05:22:27 pm

wow didn't realise i wrote ethanol like that i meant CH3CH2OH