revison on redox-2

Camp science part 2 chemistry july 2011

Q6.RUSTING= SM 2007 no.6 ,[object Object],P PRESENCE OF WATER AND OXYGEN

(ii) labelled diagram the rusting of iron. Anode: Fe  Fe 2+ + 2e Cathode : O 2 + 2H 2 O + 4e  4OH - 2 O 2 drop of water A piece of iron O 2 O 2 rust 1 2 3 4 e e Fe 2+

(b) (i) Describe the reactions that occur after the Fe 2+ and OH - ions are formed . ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],+ 2 to +3

c(i) Explain how the zinc plates protect the iron ship from rusting. ,[object Object],[object Object],[object Object],[object Object]

( ii) Write the half equation for the reaction in 6(c)(i). Zn  Zn +2 + 2e

(a) The following are the formulae of two compounds. Al 2 O 3 Cu 2 O ,[object Object]

Al 2 O 3 = 0 2Al + 3O =0 2Al + 3(-2) =0 2Al = +6 Al =+3 Cu 2 O = 0 2Cu + O =0 2Cu -2 =0 2Cu = -2 Cu =+1 oxidation number of Al is +3 oxidation number of copper is +1

[object Object],Compound IUPAC nomenclatre system Al 2 O 3 Aluminium Oxide Cu 2 O Copper(I) Oxide

[object Object],[object Object]

[object Object],[object Object],[object Object],Answer:

[object Object],[object Object],[object Object],Acidified Potassium manganate(VII) solution Answer:

Half equation at positive terminal MnO 4 - + 8H + + 5e - Mn 2+ + 4H 2 O Half equation at negative terminal Fe 2+ Fe 3+ + e -

[object Object],[object Object],[object Object],[object Object],Answer :

[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],Changes after 10 minutes

revison on redox-2

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