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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 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
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
C C + O O O O Types: Synthesis Example C + O2 CO2 General: A + B AB
+ Na Na Cl Cl Types: Decomposition Example: NaCl Na + Cl General: AB A + B
Hg Hg Hg Hg + O O O O Types: Decomposition Example 2HgO 2Hg + O2 General: AB A + B
+ + Cl Cl Cl Cl Zn Zn Cu Cu Types: Single displacement Example: Zn + CuCl2 ZnCl2 + Cu General: AB + C AC + B
Ca Ca + + Mg Mg S S O O Types: Double displacement Example: MgO + CaS MgS + CaO General: AB + CD AD + CB
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