Question

how can a chemical equation becomes more informative

Answer 1

Chemical equations can be made more informative by expressing the following characteristics of the reactants and products.
1) Physical state
ii) Heat exchange (exothermic or endothermic change)
iii) Gas evolved (if any)
iv) Precipitate formed (if any)
i) Expressing the physical state : The physical state of the substances may be mentioned along with their chemical formulae. The different states i.e., gaseous, liquid and solid states are represented by the notations (g), (Z) and (s) respectively. If the substance is present as a solution in water, it is represented as (aq).