if something can be constructed out of its base properties, you have eveything you need - similarly to say that life is material begs the q why life does not form when every material requirement for its existence is met and why life ceases in the presenceof such a fully equipped environment
what is the chemical difference?
well for starters, the heart stopped working. or there's been an issue in the brain. or perhaps a disease, virus, etc., totally messed up a bodily process that lead to death.
cells are not chemicals
to be specific, an example of the red blood cell...
it is 97% hemoglobin without water.
meaning that the RBC has lots of iron (Fe), a heme portion, and a globin portion.
the globin are grouped up amino acids, while the heme portion will attach to albumin when the red blood cell dies and turn into bile.
..
or the fact that we carbon-based.
then the question is "why" since you advocate that life is essentially dull matter to begin with - what chemicals does a living person have that a dead person doesn't? Why can't dead persons be revived or persons expectant of death be saved by applying these chemicals?
dead persons can be revived, depending on how far into clinical death they're in. 4 minutes of oxygen-deprivation before the brain starts dying!
so since everyone knows they will die, why don't they keep a stock pile of living person chemicals on hand to avoid this scenario?
that's a question of the ability to attach the nerves to every part of the body properly, without a scratch, and ever-so-perfectly.. to be blunt.