Chemical Reactions Involving Oxygen 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. sulfur + oxygen  sulfur dioxide phosphorus + oxygen  diphosphorus pentoxide magnesium + oxygen  magnesium oxide iron + oxygen  iron(III) oxide

Chemical Reactions Involving Oxygen 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

Types: Synthesis General: A + B  AB Example C + O2  + O O O O O O O

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

Types: Decomposition Example 2HgO  O Hg Hg O + General: AB  A + B

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

Types: Double displacement Example: MgO + CaS S O  Mg Ca + O S Mg Ca + General: AB + CD  AD + CB

Chemical Reactions Involving Oxygen 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 Part 1 reactions can be described as both combustion and synthesis Litmus turned red. Non-metal oxides react with water to form acids. Oxygen (O2). A chemical change. If it were a physical change of state it would keep bubbling until it all evaporated (not turn solid)

Chemical Reactions Involving Oxygen This is a decomposition reaction potassium chlorate  potassium chloride + oxygen Single displacement Decomposition Synthesis Double displacement Combustion (and double displacement?) For more lessons, visit www.chalkbored.com