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Unit 3. Mixtures and Pure Substances
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Unit 3. Mixtures and Pure Substances

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  • 1. UNIT 3. MIXTURES AND PURE SUBSTANCES Pure substances Mixtures
  • 2. VOCABULARY  Complete as follows… Matter= Physical= Chemical= Means= Joined= Procedure= Retains= Distilled=
  • 3. Pure Substances  A portion of matter that has definite chemical and physical properties. carbon dioxide (CO2), water (H2O), nitrogen dioxide (NO2)…
  • 4. One kind of pure substance: Elements  Pure substance formed by one type of atom that cannot be separated into simpler substance by physical or chemical means • Ex. Physical means: distillation, filtration… • Ex. Chemical means: chemical reaction: substitution, reduction…  Its symbol in the periodic table is its chemical formula
  • 5. Other kind of pure substance: Compounds  Pure substance composed of two or more different elements joined by chemical bonds.  Has a chemical formula with at least two different letter.  Can only be separated by chemical procedures, not physically.
  • 6. Mixtures  A combination of two or more pure substances that are not chemically combined.  Each substance retains its properties in the mixture and has his own chemical formula.  They can be separated physically.  There are two types: homogeneous and heterogeneous, depending on the capacity of distinguish the different components or not.
  • 7. Can you identify the following? You are going to see a series of photos. Say if each photo represents an element, compound, or mixture. Review:  An element is a pure substance which contains just one type of atom.  A compound is a pure substance which contains two or more different atoms joined together.  A mixture contains two or more different substances that are only physically joined together, not chemically.
  • 8. Element, Compound, or Mixture? Rocks
  • 9. Element, Compound, or Mixture? Rocks
  • 10. Element, Compound, or Mixture? Copper
  • 11. Element, Compound, or Mixture? Copper
  • 12. Element, Compound, or Mixture? Jelly Beans
  • 13. Element, Compound, or Mixture? Jelly Beans
  • 14. Element, Compound, or Mixture? Table Sugar
  • 15. Element, Compound, or Mixture? Table Sugar
  • 16. Element, Compound, or Mixture? Diamond
  • 17. Element, Compound, or Mixture? Diamond
  • 18. Element, Compound, or Mixture? Tea
  • 19. Element, Compound, or Mixture? Tea
  • 20. Element, Compound, or Mixture? Salt
  • 21. Element, Compound, or Mixture? Salt
  • 22. Element, Compound, or Mixture? Neon Gas
  • 23. Element, Compound, or Mixture? Neon Gas
  • 24. Element, Compound, or Mixture? Salad
  • 25. Element, Compound, or Mixture? Salad
  • 26. Element, Compound, or Mixture? Distilled Water
  • 27. Element, Compound, or Mixture? Distilled Water
  • 28. Element, Compound, or Mixture? Aluminum
  • 29. Element, Compound, or Mixture? Aluminum
  • 30. Element, Compound, or Mixture? Lemonade
  • 31. Element, Compound, or Mixture? Lemonade
  • 32. Element, Compound, or Mixture? Silver
  • 33. Element, Compound, or Mixture? Silver
  • 34. Element, Compound, or Mixture? Sand
  • 35. Element, Compound, or Mixture? Sand
  • 36. exercises 1)Complete the statements in your notebook: a) b) c) d) e) f) g) A mixture is a group of two or more ……………. All pure substances have a constant chemical ……….. A mixture can be separated by ……………. means A pure substance like a compound can be separated by ………… means An element is a pure substance composed by one type of ………. A heterogeneous mixture can be identified using your ………. A homogeneous mixture needs a ………………… to distinguish all the components