What is a chemical equation ?

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asked Apr 23 in Class VIII Science by navnit40 (-2,975 points)

(a) What is a chemical equation ?
(b) Why it is necessary to balance a chemical equation ?
(c) What are the limitations of a chemical equation ?

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1 Answer

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answered Apr 23 by aditya23 (-879 points)

(a) Chemical Equation— A chemical equation is the symbolic representation of a chemical reaction using the symbols and the formulae of the substances involved in the reaction.
(b) A chemical equation needs to be balanced so as to make the number of the atoms of the reactants equal to the number of the atoms of the products.
(c)

  1. It does not inform about the physical states of the reactants and the product i.e. whether they are solids, liquids and gases.
  2. It does not inform about the concentration of reactants and products.
  3. It does not inform about the time taken for the completion of the reaction.
  4. It does not inform about the rate at which a reaction proceeds.
  5. It does not inform about the heat changes during the reaction i. e. whether the heat is given out or absorbed.
  6. It does not inform about the conditions such as temperature, pressure, catalyst etc. which affect the reaction.
  7. It does not inform about the nature of the reaction i.e. whether it is reversible or irreversible.

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