Mixed and pure substances

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We can distinguish pure and mixed substances. The difference is that the first have well defined specific properties, while the mixtures do not. This is explained in this presentation.

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Mixed and pure substances

  1. 1. Matter: Pure and Mixed substances http://iespebilingue.wikispaces.com
  2. 2. http://iespebilingue.wikispaces.com Classification SUBSTANCES MIXED SUBSTANCES OR MIXTURES PURE SUBSTANCES HETEROGENEOUS HOMOGENEOUS LIQUID SOLUTIONS GAS SOLUTIONS SOLID SOLUTIONS COMPOUNDS ELEMENTS
  3. 3. http://iespebilingue.wikispaces.com SUBSTANCES PURE SUBSTANCES: they have well defined specific properties: density, fusion, boiling temperatures… MIXTURES: they are made up of two or more different substances. They do NOT have well defined Specific properties.
  4. 4. Concrete, conglomerate rock, as well as oil and vinegar are all heterogeneous mixtures. The particles are large enough to be seen and can be separated from the mixture. Homogeneous mixtures are very well mixed. A salt solution is a homogeneous mixture.  http://iespebilingue.wikispaces.com MIXTURES HETEROGENEOUS: we can clearly distinguish the different components. Some examples include salads, soups, and cookies.   HOMOGENEOUS: we cannot see the different substances that make up a mixture.   Some of examples include alcohol and water.
  5. 5. Have you ever put sugar in a glass of milk? After you stir, you can no longer see the sugar. The sugar is still there, as you can taste it. A mixture of sugar and milk is called as solution . By evaporation we can separate the different kinds of matter in solution. http://iespebilingue.wikispaces.com HOMOGENEOUS MIXTURES LIQUID SOLUTIONS: we usually speak of solutions for liquid mixtures. GAS SOLUTIONS: like the air. SOLID SOLUTIONS: like steel which is a mixture of iron and carbon.
  6. 6. http://iespebilingue.wikispaces.com PURE SUBSTANCES COMPOUNDS: They can be decomposed into simpler substances using chemical methods. ELEMENTS: They can’t be decomposed. There are 109 elements.
  7. 7. The Periodic Table of Elements http://iespebilingue.wikispaces.com
  8. 8. http://iespebilingue.wikispaces.com Separating components SEPARATION TECHNIQUES DECANTATION FILTRATION MAGNETISM SIEVING DISTILLATION CRYSTALIZATION
  9. 9. Decantation  is a process for the separation of mixtures. This is achieved by carefully pouring a solution from a container in order to leave the sediments in the bottom of the original container. Decantation http://iespebilingue.wikispaces.com
  10. 10. Filtration Filtration  is commonly the mechanical or physical operation which is used for the separation of solids from fluids (liquids or gases) by interposing a medium through which only the fluid can pass.  http://iespebilingue.wikispaces.com
  11. 11. Magnetism Magnetism is a process in which magnetically susceptible material is extracted from a mixture using a magnetic force. http://iespebilingue.wikispaces.com
  12. 12. Sieving A  sieve separates wanted elements from unwanted material. http://iespebilingue.wikispaces.com
  13. 13. Crystalization : this technique is used for obtaining a compound in pure solid form of well-defined geometrically shaped crystals.  http://iespebilingue.wikispaces.com Crystallization
  14. 14. Distillation  is a method of separating mixtures. It is a   process in which a liquid or vapour mixture of two or more substances is separated into its component fractions, by the application and removal of heat. http://iespebilingue.wikispaces.com Distillation
  15. 15. <ul><li>http :// explore.ecb.org /videos/ VLC_media?P1=VLC077 & REFERER=OTHER </li></ul><ul><li>http :// www.differencebetween.net / science / difference - between - heterogeneous - and - homogeneous / </li></ul><ul><li>http :// www.rpdp.net / sciencetips_v3 /P8A3. htm </li></ul><ul><li>http :// chemsite.lsrhs.net / Intro / Pure_vs_mixtures.html </li></ul><ul><li>http :// www.wineloverspage.com /vino101/decant07. phtml </li></ul><ul><li>http :// chemistry.tutorvista.com / inorganic - chemistry / properties - of - solutions - and - types - of - mixtures.html </li></ul><ul><li>http :// fphoto.photoshelter.com / image / I0000nrYPvzifous </li></ul><ul><li>http :// chemsite.lsrhs.net / Intro / Pure_vs_mixtures.html </li></ul><ul><li>http ://64.224.111.143/ handbook / periodic / </li></ul>http://iespebilingue.wikispaces.com References

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