Wood - Compound or Mixture
Is wood a compound or a mixture?
I would call it a mixture, if only because it has water and structured
voids (air) and a modest content of biological molecules other than cellulose.
If it is sufficiently shredded to pulp, bleached and dried, you might have
an almost homogeneous cellulose powder,
consisting of only a few slightly differing compounds.
Strictly, wood is a mixture, in as much as it is possible to separate it
into various components. Having said that, I think that there is too much
emphasis placed on "compound" vs. "mixture" classifications, since it is
always possible to find systems that are not clearly one or the other.
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Update: June 2012