ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: Destiny on January 17, 2012, 01:22:52 pm

Title: Redox equations with only one overall reactant/Product...?
Post by: Destiny on January 17, 2012, 01:22:52 pm

They're driving me up the wall.
I have two questions from the Heinemann Workbook 2 that look like this:  :'(
(http://img819.imageshack.us/img819/5387/problematicch.png)
I googled for help, but one website said that I should just duplicate the product or reactant for both half equations.  So that method worked for the first equations, where I duplicated the S204(2-) ion.  But it doesn't work for the second questions, I attempted to duplicate HCOOH(aq) and it didn't work with the O2

The answers say this:
(http://img687.imageshack.us/img687/8949/answerproblematic.png)
It looks as if for the second question O2 simply didn't react with anything, and became nothing, which they then balanced :/
Could you guys give me any tips as to how to approach these sorts of questions?  Would be much appreciated....

Title: Re: Redox equations with only one overall reactant/Product...?
Post by: ggxoxo on January 31, 2012, 12:02:32 am

Yea... lol I saw the qn in Heinemann 2!!!

Title: Re: Redox equations with only one overall reactant/Product...?
Post by: Destiny on February 02, 2012, 04:20:52 pm

:(
I still don't get it...

Title: Re: Redox equations with only one overall reactant/Product...?
Post by: ggxoxo on February 03, 2012, 11:28:09 pm

Ask your teacher... :)

Title: Re: Redox equations with only one overall reactant/Product...?
Post by: Destiny on February 05, 2012, 08:37:06 pm

I will, she's an examiner Dx