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Quìmica primero curso del paula

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Quìmica primero curso del paula

  1. 1. Lecciòn 1Recognizing Four Types ofChemical Reactions St. Anne` School
  2. 2. Today we shall look at four types of chemicalreactions ……1.Synthesis2.Decomposition3.Singlereplacement4.Double replacement
  3. 3.  A chemical reaction takes place when two or more substances combine and yield one or more other substances with different characteristics.
  4. 4. Today we shall look at four types of chemicalreactions ……1.Synthesis2.Decomposition3.Singlereplacement4.Double replacement
  5. 5. Today we shall look at four types of chemicalreactions ……1.Synthesis2.Decomposition3.Singlereplacement4.Double replacement
  6. 6. Synthesis occurs when two substances combinechemically to yield a new substance withdifferent properties.For exampleSodium plus Chlorine yield Salt Na + Cl  NaCl
  7. 7. Decomposition takes place when a substance isbroken down into two or more substances withdifferent properties.For example 2H2O  O2 + 4HWater yields Oxygen and Hydrogen
  8. 8. Single replacement takes place when a substance takes the place of another substance in a compound.For example 2Al + 3Ag2 S  3Ag + Al2S3Aluminum plus Silver sulfide yields Silver plus Aluminum sulfide
  9. 9. Double Replacement takes place when substances exchange places.For example NaOH + H2SO4  Na2SO4 + H2OSodium hydroxide and Sulfuric acid yield Sodium sulfate and water
  10. 10. See if you can tell what the following type ofReaction is 4Fe + 3O2  2Fe2O3

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