Question

2.
Giving an example list two Information
which make chemical equation more
useful informative).​

Answer 1

a) The various ways in which a chemical equation can be made more informative are :

(i) By indicating the physical states of the reactants and products. Example: Gaseous state is indicated by the symbol (g).

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

(ii) By indicating the heat changes taking place in the reaction. For xxample: An exothermic reaction is indicated by writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation.

C (s) + O2 (g) CO2 (g) + Heat

(iii) By indicating the "conditions" under which the reaction takes place.

Example: Delta stands for heat which is written over the arrow of the equation.

(b) Ca(OH)2 (aq) + CO2 (g)  CaCO3 (s) + H2O (l)

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