Give examples of physical and chemical phenomena known to you. How are these phenomena used in human practice?

Give examples of physical and chemical phenomena known to you. How are these phenomena used in human practice? Give an example when a physical phenomenon accompanies a chemical one.

A physical-chemical phenomenon occurs – the dissolution and dissociation of the acid into ions.
Chemical phenomena: the appearance of rust on a nail, yellowing of leaves in autumn, cloudier than lime water, burning of a candle, sour milk, fermentation of juice.
Physical phenomena: evaporation and freezing of water, the spread of the smell of perfume, the formation of frost, melting of metal, the glow of an electric bulb.
An example of a chemical phenomenon in human practice:
The combustion process is chemical, because as a result of it new substances are formed, the original substance is converted into other substances. The practical application of combustion processes can be found when burning organic substances – fuel: natural gas, gasoline, fuel oil, etc., as a result of which carbon dioxide and water are formed, a huge amount of heat is released, which is used to heat heat exchangers or is converted into mechanical energy.
An example of a physical phenomenon that accompanies a chemical:
The appearance of an unpleasant smell of rotten eggs when hydrochloric acid is added to iron sulfide (II).

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