I think the mix. of iron and alminum is number 5 and the homogenous gaseous mixture is number 6.
My reasoning is as follows: the iron and almunium is not uniform throughout, and that's what we're seeing here I think... to different substances marked in there own little "sections". As for the homogenous haseous mixture I reason its number 6 because its a gas (they're far spread apart) and it appears like they're all in one (even though I know there's two different colors.... this is where I'm unsure).
Thanks for the reply.