Iodine forms a molocule that looks like 'I-I', with I representing iodine (or in written form, I subscript 2). As for the starch thing, what the hell is the question?
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a souluble starch is just sugar (C6H12O6) combined. I dont know how many you put together befor it becomes unsoulble though... its probaly not alot, like more than 3 and it probaly wouldnt disolve in water because of its size.