Answer :

Ways in which a chemical reaction can be informative:

(i) Indicating the physical state of reactants and products. Example: (g) denotes the gaseous state.

Zn (s) + H2SO4 (aq.) ZnSO4 (aq.) + H2 (g)

(ii) Indicating Heat change. For example: writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation denotes exothermic reaction.

C(s) + O2 (g) CO2 (g) + Heat

(iii) Indication of the "conditions" under/in which the reaction takes place.

Example: Heat is denoted by delta which is written over the arrow in an equation.

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