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After a chemical reaction _____________
1. number of molecules remain same as before
2. number of compounds is same
3. number of atoms of each element is same
4. Both (1) and (2)

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Correct Answer - Option 3 : number of atoms of each element is same

Explanation:

  • Matter cannot be created or destroyed, according to the Law of conservation of matter.
  • Hence, the number of atoms of each element in the reactants must match the number of atoms of each element in the products in chemical equations.
  • In a chemical equation, there are no new atoms formed, and there are no atoms destroyed.
  • All atoms of the reactant(s), thus must equal the atoms of the product, according to the Law of Conservation.
  • As a result, chemical equations must be balanced.
  • This is accomplished by including coefficients into the reactants and/or products.
  • This addition of coefficients is a method called stochiometry
    • Stoichiometry is a branch of chemistry that studies the proportions of reactants and products in chemical processes.
    • Whole numbers (coefficients) are used to illustrate the quantities (usually in moles) of both the reactants and products in any balanced chemical reaction.
  • Unbalanced chemical equations (also known as skeleton equations) violate the law and should never be employed in chemical calculations.
  • The number of atoms of a chemical equation remains the same in a chemical reaction, so the correct answer to this question is - number of atoms of each element is the same.

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