pure and impure substances

• most materials that we use are mixtures, and just a few are pure elements
• pure substances single substance made of only one particle
• impurities change the temperature at which a substance boils and melts
• an impure substance contains more than one element it has a compound
• pure particles 


  made of only one chemical element or compound meaning its a mixture
• impure substances


  a substance is made of more than one element or compound meaning its a mixture
• impurities


  a label of bottled water will often include a small list of small amounts of other substances
• particle diagrams

  element, compound & mixture