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A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions..

A mixture is a material system made up by two or more different substances which are combined physically together but are not combined chemically.
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Compound of Methane Gas Carbon (4 Valence or Outer Electrons) combined with 4 Hydrogens (1 Valence or Outer Electron on Each Hydrogen)
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