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Chemical Reaction Formula

Chemical reactions, in which compounds are formed or transformed, are represented by chemical equations. Chemical reaction is "any combination of two or more chemical substances if the combination does not occur in nature and is not, in whole or in part, the result of a chemical reaction."The following are the steps involvedĀ  in writing a Chemical Reaction Formula.
  1. Write the word equation of the reaction.
  2. Write the formula of the reactants on the left side in equation.
  3. Write the formula of the products on the right side in equation.
  4. If there are two or more reactants or products then write plus (+) sign in between them.
  5. Show the direction of the reaction with an arrow($\rightarrow$) between reactants and products.
  6. The equation thus obtained is called the skeleton equation.

  • Thus the chamical reaction can be represented by an equation using symbols, formulas and signs.

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    Chemical Reaction Examples

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    Example problems based on the concept chemical reaction are given below.

    Solved Examples

    Question 1: Form the chemical equation for the formation of sulfur from the reaction of hydrogen sulphide and sulfur dioxide.
    • The word equation for this reaction is
    Hydrogen sulphide + Sulfur dioxide $\rightarrow$ Sulfur + water
    • The skeleton equation is
    H2S + SO2 $\rightarrow$ S + H2O
    • The balanced equation is
    16H2S + 8SO2 $\rightarrow$ 3S + 2H2O


    Question 2: Write the chemical equation for the formation of potassium chloride and manganese chloride from potassium permanganate and balance the equation.
    • The word equation for the reaction is
    Potassium permanganate + Hydrogen chloride $\rightarrow$ Potassium chloride + Manganese chloride + water + chlorine
    • The skeleton equation for this chemical reaction is
    KMnO4 + HCl $\rightrrow$ KCl + MnCl2 + H2O + Cl2
    • The balanced equation for this chemical reaction is
    2KMnO4 + 16HCl $\rightrrow$ 2KCl + 2MnCl2 + 8H2O + 5Cl2

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