if gases are released by a chemical reaction then the total mass of the product will be less than the total mass of the reactants
product is chemical. developing_chemical_weapons is not developing_product. propionic_acid is chemical_compound. developing_chemical_weapons is developing_product. chemical_reaction is not chemical_process. exothermic_reaction is not chemical_reaction. acid is chemical. propionate is chemical_compound. propionic_acid is not chemical_compound. chemical_reaction is chemical_process.