1. 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

2. 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

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

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

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

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

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

8. 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)

9. Chemical Reactions Involving Oxygen
This is a decomposition reaction
potassium chlorate  potassium chloride + oxygen
Single displacement
Decomposition
Synthesis
Double displacement
Combustion (and double displacement?)
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