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Explanation:
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Class 10
PHYSICS
CHEMICAL REACTIONS AND EQUATIONS
What are the conventions used in writing a chemical equation?
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Text Solution
Solution
Conventions used in written a chemical equation : <br> (1) The reactants are written on the left hand side (LHS) , While the products are written on the right hand side (RHS) . <br> (2) Whenever there are two or more reactants , a plus sign (+) is written between each two of them. Similarly , If there are two or more products , a plus sign is written between each two of them . <br> (3) Reactant side and product side are connected with an arrow
pointing from reactants to products . The arrow represents the direaction of the reaction . Heat is to be given from outside to the reaction , it is indicated the sign
written above the arrow. <br> (4) The cinditions like temperature , pressure, catalyst etc., are mentioned above the arrow
pointing towards the product side. <br> (5) The physical states of the reatants and products are also mentioned in a chemical equation . The notations g , l, s, and aq are written in brackets as a subscript along with the symbols / formulae of reactants and products. The symbols g, l, s, and aq stand for gaseous , liquid , solid and aqueous respectively. <br> If the product is gaseous , instead of (g) it can be indicated by an arrow
pointing upwards. If the product formed is insoluble solid , then instead of (s) it can be indicated by an arrow
pointing downwards . <br> (6) Special information or names of reactants/ products are written below their formulae.