Chemical Reaction in Whitewashing Walls
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Questions and Answers

What is the chemical formula for marble?

  • H2O
  • CO2
  • Ca(OH)2
  • CaCO3 (correct)

    • In the burning of coal, what is the product when carbon combines with oxygen?

  • H2O
  • CO
  • CH4
  • CO2 (correct)

    • Which process releases heat along with the formation of products?

  • Photosynthesis
  • Respiration
  • Combustion (correct)
  • Decomposition

    • Which type of reactions are combination reactions?

    <p>Exothermic</p> Signup and view all the answers

    What is the product formed when hydrogen gas reacts with oxygen gas?

    <p>H2O</p> Signup and view all the answers

    Where does respiration get the energy from?

    <p>Food we eat</p> Signup and view all the answers

    In Step II, which element was selected to start balancing the chemical equation?

    <p>Oxygen (O)</p> Signup and view all the answers

    How many oxygen atoms are there on the right-hand side (RHS) of the unbalanced equation?

    <p>4</p> Signup and view all the answers

    What is the coefficient placed before H₂O to balance the number of hydrogen atoms in the partly balanced equation?

    <p>2</p> Signup and view all the answers

    Which element's atoms are still not balanced even after balancing the hydrogen atoms?

    <p>Iron (Fe)</p> Signup and view all the answers

    What is changed when balancing chemical equations according to the text?

    <p>The formulae of compounds or elements</p> Signup and view all the answers

    Why is it convenient to start balancing with a compound containing the maximum number of atoms?

    <p>To simplify the balancing process</p> Signup and view all the answers

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