Elements, Compounds and Mixtures

• Elements - made up of atoms
• Atom - the smallest particle of an element
• Elements consist of only one type of atom
• An example of an element are?

  • Carbon
  • Nitrogen
  • Hydrogen
• Compounds - made up of two or more different elements
• The elements of a compound are chemically bonded to one another
• An example of a compound?

  • Carbon (C) and Oxygen (O2) react with each other it will form Carbon Dioxide (CO2)
• Mixtures - a combination of 2 or more different elements
• mixtures are not chemically bonded to one another, instead they are physically near to each other
• An example of a Mixture?

  When sand and water form with each other it forms a mixture
• Elements such as hydrogen, consist of only one type of ATOM
• Gold (au) - unreactive

  - exist on its own as an element
• Properties of compounds are often very different to their original elements
• mixtures will show the properties of both elements
• pure substance - is one that contains only one element or compound
• Pure substances have boiling points that does not change
• Mixtures are not pure substances

  • contain a number of different elements / compounds
  • will melt and boil over a range of temperatures