A pure substance is a substance with only one type of molecule
A mixture is a substance with multiple types of molecules.
Each substance is identifiable by its properties.
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Three phases
A substance is encountered in daily life in one of the three phases.
either it is: Solid, Liquid or Gaseous.
somtimes we also use substances dissolved in water
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Slide 5 - Tekstslide
Points and ranges
If you have a mixture, it has substance properties of both materials. It no longer has a set boiling temperature (point) or melting temperature (point) but it now has a range of boiling and melting temperature. You can use this to see if a substance is a pure substance or mixture.