Elements, compounds & mixtures

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  • 1. D. Crowley, 2007
  • 2. To understand the difference between an element, a compound and a mixture
  • 3. Look at the pictures below - is it an element or a compound? Element Element Compound Element Compound
  • 4. How about this - element or compound?  Actually this is neither an element or a compound - it is a mixture!
  • 5. How can we describe a mixture? Remember: an element is made up of just one type of atom A compound is two or more elements which are chemically bound together… A mixture is made from different substances which are not chemically bound
  • 6.  Imagine coloured sweets which can be mixed together in a packet, but are not chemically joined together  You could easily separate these into their different colours - without needing a chemical reaction… Mixture Element 1 Element 2 Element 3 Element 4
  • 7. A mixture is made from different substances, which are not chemically bound E.g. air is a mixture of gases The gases (oxygen; nitrogen; argon; and carbon dioxide) can be easily separated The properties of the mixture are just a mixture of the properties of the separate parts!!!
  • 8. Remember, in a compound a chemical reaction binds the substances together. This means the properties of the newly formed compound are different from the original elements In a mixture no chemical reaction occurs So the properties of the mixture is a mixture of all the properties that make the mixture up!
  • 9.  E.g. a mixture of iron powder and sulphur powder will show properties of both iron and sulphur!  This means our mixture will contain grey magnetic bits of iron + yellow bits of sulphur
  • 10. Look at the following - copy down the particle boxes, and decide if it represents an element, compound or mixture Element Element Compound Mixture Mixture
  • 11.  An element contains just one type of atom  A compound contains two or more types of atoms that are chemically bound  A mixture contains two or more different substances, that are not chemically bound  The different substances in a mixture can be elements or compounds
  • 12.  Copy out the table, given a description of the diagram (e.g. pure element, mixture of elements, compound etc…)  Add an example to your description Diagram Description Example Pure element Oxygen Pure compound Carbon dioxide Mixture of elements Oxygen & Helium Mixture of compounds Alcohol & Water Mixture of elements & compounds Air
  • 13. Try the online quiz: http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_test.shtml