Define a pure substance in strict chemical terms as a single element or a single compound that is entirely unmixed with any other substance.
Understand that chemically pure elements and compounds melt and boil at specific, singular temperatures.
Utilize provided melting point and boiling point data to accurately distinguish pure substances from physical mixtures.
Differentiate between the strict chemical definition of a pure substance and the more colloquial, everyday use of the term (e.g., describing unadulterated milk as 'pure').
