What are the names of the reactions, as a result of which one complex substance is formed from two or more substances?

Compound reactions are such reactions, during the course of which one complex is obtained from two or more substances.
For example:

1.C + O2 = CO2; carbon, interacting with oxygen, form a complex substance carbon dioxide.

2. NH3 + CO2 + H2O = NH4HCO3; three substances: carbon dioxide, ammonia and water, interacting, form a new complex substance, ammonium bicarbonate.



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