ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: lacoste on June 03, 2009, 05:39:37 pm

Title: stav 09 qst
Post by: lacoste on June 03, 2009, 05:39:37 pm

question 9 bi:

glucose can be broken down to produce alcohol.

name this type of chemical reaction?

i said fermentation.

the solution is redox or oxidation

what is the correct answe/best one to give?


thanks :)

Title: Re: stav 09 qst
Post by: TrueTears on June 03, 2009, 05:41:09 pm

It can be redox or oxidation or fermentation or even anaerobic respiration!

Title: Re: stav 09 qst
Post by: lacoste on June 03, 2009, 05:45:33 pm

thanks TT.

i read the question again and the context is (at the very start of qst):
flowers produce nectar ... contains glucose and sucrose.
therefore, that does mean that yeast will be abesent hence fermentation isnt considered an ans.?

cheers :)

Title: Re: stav 09 qst
Post by: shinny on June 03, 2009, 05:52:47 pm

I'm not sure whether the flower thing is relevant, since the question's just saying that the sugar from plant nectar can be turned into alcohol, but the plant itself doesn't do this as far as I know. So fermentation might be correct, but it's probably not a universal answer for all situations involving glucose oxidation. As for anaerobic respiration, that's actually wrong. Fermentation and anaerobic respiration are two separate processes.

Title: Re: stav 09 qst
Post by: TrueTears on June 03, 2009, 05:59:38 pm

Yea, /0 put anaerobic respiration for his answer in trial exam and teacher marked it correct. :\

Title: Re: stav 09 qst
Post by: shinny on June 03, 2009, 06:03:02 pm

Not surprised your chem teacher didn't know since it's more of a bio thing and I only found out this year, but yeh, they are actually two different processes =\ Have a look at the equations here for 'real' anaerobic respiration and you'll see what I mean.

Title: Re: stav 09 qst
Post by: lacoste on June 03, 2009, 06:04:40 pm

thanks!!!!!!!!!

also for CSE 09 May test

MC question 5 ... how do you do it? can't get the right answer after trying to find the limiting reagent.


cheeeeeers!

Title: Re: stav 09 qst
Post by: TrueTears on June 03, 2009, 06:04:46 pm

Quote from: shinny on June 03, 2009, 06:03:02 pm

Not surprised your chem teacher didn't know since it's more of a bio thing and I only found out this year, but yeh, they are actually two different processes =\ Have a look at the equations here for 'real' anaerobic respiration and you'll see what I mean.

ahhhh thanks shinny!