What are the Properties of a Mixture?
Describing Matter            Lesson 1.1

Pure Substances & Mixtures
  • Elements and compounds are pure substances, but most of the materials you see every day are not.
  • Instead, they are mixtures.
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Mixtures
  • A mixture is made of two or more substances that are together in the same place, but are not chemically combined.
   Mixtures differ from compounds in two ways.
  1. Each substance in a mixture keeps its individual properties.
  2. The parts of a mixture are not combined in a set ratio.
Hetero & Homo Geneous
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Heterogeneous
  • In a heterogeneous mixture, you can see the different parts.
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Homogeneous
  • The substances in a homogeneous mixture are so evenly mixed that you cannot see the different parts.
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Solution
  • A solution is an example of a homogeneous mixture.
  • Air is a solution of nitrogen, oxygen, plus small amounts of other gasses.
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Mixtures
  • Unlike compounds, mixtures are easily separated into their components.
  • For example, iron filings can be easily removed from salt with a magnet.