Balanced Chemical Equations in Class IX
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Questions and Answers

What is the primary principle that a balanced chemical equation must obey?

  • Law of conservation of mass (correct)
  • Law of multiple proportions
  • Law of reciprocal proportions
  • Law of definite proportions

    • What is the purpose of balancing a chemical equation?

  • To change the reactants into products
  • To ensure the number of atoms of each element is the same on both sides (correct)
  • To make the equation more complex
  • To make the equation look simple

    • What is the process of representing a chemical reaction using chemical formulas?

  • Chemical equation representation (correct)
  • Stoichiometry
  • Chemical reaction notation
  • Chemical formula representation

    • What is the term for the study of the quantitative relationships between reactants and products in chemical reactions?

    <p>Stoichiometry (D)</p> Signup and view all the answers

    What is the correct step in balancing a chemical equation?

    <p>Draw boxes around each formula (C)</p> Signup and view all the answers

    What is a skeletal chemical equation?

    <p>A chemical equation with formulas of reactants and products (C)</p> Signup and view all the answers

    What is the number of atoms of hydrogen in the reactants in the initial equation?

    <p>8 (A)</p> Signup and view all the answers

    What is the coefficient of Fe in the balanced equation?

    <p>3 (A)</p> Signup and view all the answers

    What is the name of the method used to balance the chemical equation in this example?

    <p>Hit-and-trial method (A)</p> Signup and view all the answers

    What is the purpose of writing symbols of physical states in a chemical equation?

    <p>To make the equation more informative (C)</p> Signup and view all the answers

    What is the number of atoms of iron in the reactants in the balanced equation?

    <p>3 (D)</p> Signup and view all the answers

    What is the final step in balancing a chemical equation using the hit-and-trial method?

    <p>Counting the atoms of each element on both sides of the equation (B)</p> Signup and view all the answers

    What is the purpose of including the notation (aq) in a chemical equation?

    <p>To specify that the reactant or product is present as a solution in water (C)</p> Signup and view all the answers

    What is the significance of including the physical state of reactants and products in a chemical equation?

    <p>It is necessary to specify them only when it is required to understand the reaction (D)</p> Signup and view all the answers

    What do the symbols above and/or below the arrow in a chemical equation represent?

    <p>The reaction conditions such as temperature, pressure, and catalyst (C)</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure that the number of atoms of each element is the same on both the reactant and product sides (C)</p> Signup and view all the answers

    What is the significance of the symbol (g) in the equation 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)?

    <p>It indicates that water is used in the form of steam (B)</p> Signup and view all the answers

    Why is it necessary to clean a magnesium ribbon before burning it in air?

    <p>To remove any impurities that may affect the reaction (A)</p> Signup and view all the answers

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