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Chemical Reactions

Chemical Reactions. A chemical change is any change in which a new substance is formed. Evidence: Release of energy as heat and light, change in colour, formation of gas, change in odour, etc. Examples: sulfur + oxygen  sulfur dioxide phosphorus + oxygen  diphosphorus pentoxide

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Chemical Reactions

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  1. Chemical Reactions A chemical change is any change in which a new substance is formed. Evidence: Release of energy as heat and light, change in colour, formation of gas, change in odour, etc. Examples: sulfur + oxygen  sulfur dioxide phosphorus + oxygen  diphosphorus pentoxide magnesium + oxygen magnesium oxide iron + oxygen  iron(III) oxide

  2. Types of Chemical Reactions combustion: AB + oxygen oxides of A & B synthesis: A + B  C decomposition: AB  A + B single displacement: A + BC  AC + B double displacement: AB + CD  AD + CB

  3. C C + O O O O Types: Synthesis Example C + O2 CO2 General: A + B  AB

  4. + Na Na Cl Cl Types: Decomposition Example: NaCl  Na + Cl General: AB  A + B

  5. Hg Hg Hg Hg  + O O O O Types: Decomposition Example 2HgO  2Hg + O2 General: AB  A + B

  6. + +  Cl Cl Cl Cl Zn Zn Cu Cu Types: Single displacement Example: Zn + CuCl2 ZnCl2 + Cu General: AB + C  AC + B

  7. Ca Ca  + + Mg Mg S S O O Types: Double displacement Example: MgO + CaS  MgS + CaO General: AB + CD  AD + CB

  8. Chemical Reactions combustion: AB + oxygen oxides of A & B Example: 2C8H18 + 25O2 16CO2 + 18H2O Combustion occurs when a carbon containing substance burns and creates CO2 and H2O Cellular Respiration is a controlled combustion reaction: Glucose + Oxygen  Carbon dioxide + Water

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