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The physical states of the reactants and the products are indicated by using symbols like s, l, g and aq in brackets after their symbols or formulae where s stands for solid, aq stand for aqueous solution, l for liquid and g for gas.



If a gas is evolved in the reaction, it is shown by an upward arrow line (­) after the products. If a perceptible is formed, it is shown by a downward arrow line after the product.


Evolution or absorption of heat during the reaction is shown by writing the therm ochemical equation. For an exothermic reaction, i.e., a reaction in which heat is evolved, we write + heat on the product side. For an endothermic reaction, i.e., a reaction in which heat is absorbed we write + heat on the reactant side.


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