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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: vexx on November 15, 2009, 04:05:53 pm

Title: Corrosion?
Post by: vexx on November 15, 2009, 04:05:53 pm

Hi,

We have to know these two following points for the exam, however we have not done any corrosion in class/missed two classes due to my 3/4.

* Describe the significance of corrosion of iron in social and economic terms
* Explain the chemistry involved in the corrosion of iron and the subsequent formation of rust including the electrochemical nature of the process.

Any help will be much appreciated.

Thanks,

Vexx.

Title: Re: Corrosion?
Post by: vexx on November 15, 2009, 08:21:08 pm

Anyone?

Title: Re: Corrosion?
Post by: VeryCrazyEdu. on November 15, 2009, 08:31:19 pm

welll for the first point- in economic terms it can cause a lot of damage. If not properly protected against through paint, alloys or placement with a more reactive metal rust can cause entire structures to be replaced, costing a lot of course.

For the second point, im fairly certain but dont take my work for it that the equation I learnt for it was the combined redox equation of the oxidation and reduction of iron with water and oxygen.

Thats all i got...lol my exam is tomorrow... :S

Title: Re: Corrosion?
Post by: vexx on November 15, 2009, 10:08:48 pm

thanks for that though:)
perhaps someone else can be a bit more specific with the second part?
goodluck for exam!

Title: Re: Corrosion?
Post by: Potter on November 16, 2009, 12:10:42 am

Corrosion of iron..Hmmmm..

I think it's something like this..

Fe ---> Fe2+ + 2e- - oxidation#1
Fe2+ ---> Fe3 + e- - oxidation#2
2H2O + O2 + 4e- --> 4OH- - Reduction.

Oxidation #1 and Reduction combined eq -

Fe + 2H2O + O2 --->  Fe(OH)2

4Fe(OH)2 + 2H2O + O2 ---> 4Fe(OH)3

And magically somehow Fe(OH)3 becomes..

Fe2O3.xH2O

Btw, are you planning to do muep chem at scotch college?

Title: Re: Corrosion?
Post by: vexx on November 16, 2009, 04:06:16 pm

thanks for that, i sort of get it but still a but fuzzy but my teacher said she'd go over it tomorrow :)

hmmm, i'm unsure, most likely scotch though just the time isn't so good. you doing it next year?

Title: Re: Corrosion?
Post by: Potter on November 16, 2009, 05:33:58 pm

Yeah, at scotch college too. The time is a bit of a bitch.. I think I'll just be able to make it on time..

Title: Re: Corrosion?
Post by: vexx on November 16, 2009, 05:39:10 pm

Quote from: Potter on November 16, 2009, 05:33:58 pm

Yeah, at scotch college too. The time is a bit of a bitch.. I think I'll just be able to make it on time..

hmm hopefully it works out, otherwise i'll have to deal with monash each week >_>

Title: Re: Corrosion?
Post by: kenhung123 on November 25, 2009, 07:30:39 am

How far do you live from scotch?

Title: Re: Corrosion?
Post by: vexx on November 25, 2009, 10:59:07 am

^ me? i live about 15min'ish. are you thinking of scotch enhancement too?

Title: Re: Corrosion?
Post by: kenhung123 on November 25, 2009, 01:41:38 pm

My teacher recommended Scotch seminars...not sure though

Title: Re: Corrosion?
Post by: vexx on November 25, 2009, 01:44:03 pm

scotch seminars o_o?