Frequent Questions

What is the difference between a mixture and a compound?


When a compound is formed, the identities of the reactant chemicals are lost, but in a mixture, the individual components retain their own identity and could be separated again.  For example, polyethylene is a compound, not a mixture (and is not subject to reporting under section 313).  Commercial xylene, however, is a mixture that contains different xylene isomers and ethyl benzene (all listed chemicals).  Additional information regarding compounds and mixtures can be found in Directive #4 of the Addendum to 1998 Question and Answer Document.

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