= 1.2 Phases and Classification of Matter
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Online text: https://openstax.org/books/chemistry-2e/pages/1-2-phases-and-classification-of-matter
Section of Chemistry 2e by <Paul Flowers>, <Klaus Theopold>, <Richard Langley> and <William R. Robinson>. These are whole-book authors, with no separately credited chapter author. The book citation gives publication on 14 February 2019; no section revision date is inferred.
Cited passages: Chemistry 2e, §1.2: Classification of Matter, pure substances, mixtures, variable proportions, homogeneous and heterogeneous examples.
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