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Types of Chemical Reactions
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Types of Chemical Reactions

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  • 1. Product or Reactant? • H2SO4 + BaCl2 1. BaCl2 Reactant Product 2. HCl 3. BaSO4 4. H2SO4 Product Reactant 2HCl + BaSO4
  • 2. Review Chemical Reactions Law of Conservation of Matter
  • 3. 1. Synthesis Reactions Combining of several simple substances to form a more complicated substance
  • 4. Synthesis Reactions A + B  AB A = element B = element AB = compound
  • 5. Synthesis Reactions 2Mg + O  2MgO 2 Magnesium (A) + Oxygen (B) Magnesium oxide (AB)
  • 6. 2. Decomposition Reactions The break down of a compound into simpler substances AB  A + B Opposite of synthesis
  • 7. Decomposition Reactions 2H O  2 2H2 + O2 Done by electrolysis
  • 8. 3. Single Replacement A free element takes the place of, or replaces, another element Takes place between an element and a compound
  • 9. Single Replacement A + BC  AC + B A – free element BC - compound AC – new compound B - new free element
  • 10. Single Replacement Zn + 2HCl  ZnCl2 + H2 Hydrogen is set free
  • 11. 4. Double Replacement  Two elements in two different compounds switch places with each other  Takes place between two compounds  Two new compounds form
  • 12. Double Replacement AB + CD  AD + CB AB – compound 1 CD – compound 2 AD – new compound 1 CB – new compound 2
  • 13. Double Replacement  Na(OH) + HCl  NaCl + H(OH)  (OH) and Cl change places  2 new compounds form  NaCl and H O 2
  • 14. These reactions can be… ExothermicHeat is given off It feels hot!
  • 15. These reactions can be… EndothermicHeat is absorbed It feels cold!