Pure Chemical substances

Pure Substances– a sample of matter, either a single element or a single compound that has definite chemical and physical properties
Element– a substance that cannot be separated or broken down into simpler substances by chemical means; all atoms of an element have the same atomic number

Types of pure substances:

  1.  
    1.  
      • Elements

      • Compounds

  1. Elements- 

                     elements are pure substances that contain only one kind of atom
    1. Has its own unique set of physical and chemical properties
    2. Has its own chemical symbol
    3. Molecule– the smallest of a unit of substance that keeps all of the physical and chemical properties that of the substance; it can consist of one atom or two or more atoms bonded together
    4. Diatomic elements- two of the same atom bonded together chemically
  1. Pure Substances

-Some elements have more than one form
Allotrope– one of a number of different molecular forms of an element
-Compounds are Pure Substances
Compound– a substance made up of atoms of two or more different elements joined by chemical bonds

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