H = q for condition I in an open vessel at constant atmospheric pressure and E = q for condition II in a closed vessel.
When one or even more atoms are transformed into one or several other compounds, a chemical reaction takes place. Example: the formation of rust when iron and oxygen combine. Sodium acetate, nitrous oxide, and water are produced when vinegar and washing soda are combined. When substances or molecules undergo a chemical transformation to create new substances or compounds, a chemical reaction takes place.
When atoms establish or break carbon - carbon bonds, chemical processes take place. Reactants are also the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.
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