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a pure substance contain only a single type of molecule 

There is a single type of molecule present in a pure substance unlike mixture.

  • Molecules can be regarded as the smallest particle of a substance which posses the physical as well as chemical properties of that particular substance. Molecules can be regarded as the combination of one or more atoms.
  • Pure substances can be regarded as substances which consists of only one kind of particles.
  • Pure substances can be categorized as either a  elements or a compounds.
  • A compound can be regarded as substance that consist more than one element and they are combined chemically.
  • Then when two or more pure substances is been added together then a mixture is been formed.
  • Mixtures can be categorized as either heterogeneous or homogeneous mixtures.

Therefore, pure substance contain single molecule.

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