why 43 is b????

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why 43 is b????

Post by nurul amira on Thu Sep 02, 2010 8:33 am

explain to me, plezzzz.... bounce
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Re: why 43 is b????

Post by adriana naziha on Thu Sep 02, 2010 8:35 am

yeap2!!
pliz also explain 2 me..isnt it supposed 2 be D? Question
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Re: why 43 is b????

Post by Mimi Fazzlinda on Thu Sep 02, 2010 8:37 am

i want to know 2...
someone help us..
y the question is b??? cheers
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43..??

Post by auni on Thu Sep 02, 2010 8:39 am

yeah..y the answer B not A...? Sad
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Re: why 43 is b????

Post by amirazaidat on Thu Sep 02, 2010 8:46 am

pehal lak kau dpt A ayin???
aku dpt D..
bukan ke coating iron ngan gold boleh prevent it from rusting???
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Prevent rusting of iron

Post by Admin on Thu Sep 02, 2010 8:47 am

Coating it with less electropositive metal can protect iron from rusting.

For example like food can. Food can actually is iron coated thoroughly by tin. Tin is less electropositive than iron. It helps to protect iron rusting.

When when tin is scratched and exposed the iron beneath, rusting of iron will be sped up.
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Last edited by Admin on Sat Sep 04, 2010 2:30 am; edited 1 time in total

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Re: why 43 is b????

Post by NUR ATIQQAH SALLEHUDDIN on Thu Sep 02, 2010 8:51 am

err .. bukan ke carbon is more reactive electropositive than iron..?
so i tink betolla B.. ;d Laughing


Last edited by Admin on Sat Sep 04, 2010 2:29 am; edited 1 time in total (Reason for editing : Incorrect term used. Carbon is not used to control iron rusting. Carbon is used to reduce metal oxide to metal)
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