elements, compounds and mixtures

• Element

  All of the atoms are the same
• Elements

  • Magnesium
  • Sulfur
• Compound

  Two or more different elements chemically combined in fixed proportions
• Compounds usually have totally different properties to the elements they are made from</b>
• Mixture

  Different elements or compounds, not chemically combined
• Mixture components

  • Magnesium atoms
  • Sulfur atoms
  • Magnesium sulfide
• Separation techniques for mixtures

  • Filtration
  • Distillation
  • Crystallization
  • Chromatography
• Molecule

  Any elements chemically combined, even if they are the same element
• Molecules

  • Methane
  • Water
  • Ammonia
  • Chlorine
  • Oxygen
• Molecules that are not compounds contain the same element</b>