chem chap 5.1 elements, compounds and mixtures

• Element


  Made of only one element, pure substance
• Compound


  Made of two or more elements that are chemically combined
• Mixture


  Made of two or more elements and/or compounds that are not chemically combined
• Ratio of constituents

  • Elements have a fixed ratio
  • Compounds have a fixed ratio
  • Mixtures have no fixed ratio
• Properties

  • Elements have different properties from its constituent elements
  • Compounds have different properties from its constituent elements
  • Mixtures usually have similar properties to its constituent substances
• Melting and boiling points

  • Elements have fixed melting and boiling points
  • Compounds have fixed melting and boiling points
  • Mixtures melt and boil over a range of temperatures