Balanced Chemical Equations
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Questions and Answers

What is the fundamental principle behind balancing a chemical equation?

  • The law of conservation of energy
  • The law of definite proportions
  • The law of multiple proportions
  • The law of conservation of mass (correct)

    • What is the purpose of drawing boxes around each formula in a chemical equation?

  • To identify the reactants and products
  • To balance the chemical equation (correct)
  • To calculate the molecular weight
  • To determine the pH of the reaction

    • What is the term for the process of a metal reacting with oxygen to form a compound?

  • Oxidation
  • Corrosion (correct)
  • Reduction
  • Rancidity

    • What is the term for the process of a substance gaining oxygen?

    <p>Oxidation (C)</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure the number of atoms of each element is equal on both sides (A)</p> Signup and view all the answers

    What is a characteristic of a balanced chemical equation?

    <p>The number of atoms of each element is the same on both sides (B)</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure the number of atoms of each element is equal on both sides (D)</p> Signup and view all the answers

    What is the method of balancing chemical equations described in the text?

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

    What is the purpose of adding symbols of physical states to a chemical equation?

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

    What is the oxidation state of iron in the product Fe3O4?

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

    What is the reaction represented by the equation 3Fe + 4H2O → Fe3O4 + 4H2?

    <p>Oxidation reaction (B)</p> Signup and view all the answers

    What is the coefficient of Fe in the balanced equation 3Fe + 4H2O → Fe3O4 + 4H2?

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

    What is the primary concern when balancing a chemical equation?

    <p>Ensuring the number of atoms of each element is equal (D)</p> Signup and view all the answers

    Why is it convenient to start balancing with the compound that contains the maximum number of atoms?

    <p>To identify the element with the maximum number of atoms (A)</p> Signup and view all the answers

    What is the purpose of adding a coefficient '4' to H2O in the partly balanced equation?

    <p>To balance the oxygen atoms (B)</p> Signup and view all the answers

    How can the number of hydrogen atoms be balanced in the partly balanced equation?

    <p>By making the number of molecules of hydrogen as four on the RHS (A)</p> Signup and view all the answers

    What is the result of balancing the oxygen atoms in the equation?

    <p>Fe + 4H2O → Fe3O4 + H2 (D)</p> Signup and view all the answers

    What is the purpose of listing the number of atoms of different elements present in the unbalanced equation?

    <p>To determine the elements that require balancing (C)</p> Signup and view all the answers

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