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HELP NEEDED WITH CHEM P3 NOV 08 VARIANT 2!

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Hey everyone, so could someone plz help me out, i was doing nov.08 v2 p3 and i don't get some stuff.
Here's a link to the paper, go to Variant 2:
http://www.xtremepapers.me/CIE/Cambridg ... _qp_03.pdf

Here's a link to the mark scheme, again go to variant 2:
http://www.xtremepapers.me/CIE/Cambridg ... 8_ms_3.pdf

Q4a.iii) I wrote sodium nitrate and sodium chloride. in the mark scheme it says sodium carbonate/oxide/hydrogencarbonate. Why?

Q4b.ii) I don't get the answer in the mark scheme. I wrote 12:1 :S ??

Q7a.i) I don't get how to do this one at all :mad: could someone please explain?!
 
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