Q. 20 A3.9( 14 Votes )
What are the various
(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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