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Chemical Changes (Color Changes (Color Changes are indication of a…

- - - - This does not necessarily mean that all chemical changes involve a change of color.
- - - - This does not mean that all chemical changes involve smell
- - - - There a changes in gas transformation that are liquid or solid at the same temperature.
- - - - Not all chemical changes occur with obvious changes of temperature
- - - - As a rule physical changes such as changes of state and expansion and contraction phenomena can easily be reverted.
    - - In general chemical changes are harder to revert than physical ones.
        
        As a rule the retrieval of original substances after a chemical change requires highly complex processes.