Balancing Chemical Equations: Step-by-Step Guide
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Questions and Answers

What is the first step in balancing a chemical equation?

  • Multiply Fe by 3 on the left-hand side
  • Balance the hydrogen atoms first
  • Check the number of atoms of each element on the reactants and products side (correct)
  • Multiply the molecules of H2O by 4

    • In the equation Fe + 4(H2O) ⟶ Fe3O4 + 4(H2), how many hydrogen atoms are there on the products side?

  • 8 (correct)
  • 4
  • 16
  • 12

    • Which of the following equations is already balanced according to the text?

  • Al + H2SO4 ⟶ AL2(S04)3 + H2
  • CO(g) + O2(g) ⟶ CO2(g) (correct)
  • ZnCO3 ⟶ ZnO + CO2
  • Pb(NO3)2 + KI ⟶ KNO3 + PbI2

    • What type of reaction is represented by the equation Al + H2SO4 ⟶ AL2(S04)3 + H2?

    <p>Combination reaction</p> Signup and view all the answers

    In the equation 4Zn + 10HNO3 ⟶ 4Zn(NO3)2 + 5H2O + N2O, how many molecules of water (H2O) are produced?

    <p>5</p> Signup and view all the answers

    What is the last step in balancing the equation Fe + 4(H2O) ⟶ Fe3O4 + 4(H2)?

    <p>Balancing Fe by multiplying by 3 on LHS</p> Signup and view all the answers

    What is the black substance formed when silver articles turn black after reacting with hydrogen sulphide?

    <p>Silver sulphide</p> Signup and view all the answers

    Which phenomenon is involved when silver articles develop a black layer over time?

    <p>Corrosion of silver</p> Signup and view all the answers

    What type of decomposition reaction requires energy in the form of heat to break down the reactants?

    <p>Thermal decomposition reaction</p> Signup and view all the answers

    In a decomposition reaction requiring light energy, what type of energy-driven reaction is it known as?

    <p>Photochemical decomposition reaction</p> Signup and view all the answers

    Which compound decomposes into calcium oxide and carbon dioxide when heat energy is supplied?

    <p>CaCO3</p> Signup and view all the answers

    What products are formed when the electrolytic decomposition of water occurs?

    <p>$H_2$ and $O_2$</p> Signup and view all the answers

    What is the primary reason for using nitrogen gas instead of air to pack food items like potato wafers?

    <p>To prevent oxidation of fats and oils</p> Signup and view all the answers

    How does rancidity impact food items?

    <p>It results in a foul taste and smell</p> Signup and view all the answers

    Why is it recommended to avoid keeping cooked food and food materials in direct sunlight?

    <p>To prevent rancidity</p> Signup and view all the answers

    Which metal object is particularly susceptible to damage caused by environment factors like oxidation?

    <p>Iron railing</p> Signup and view all the answers

    What is the color change observed when iron nails are dipped in copper sulphate solution for 30 minutes?

    <p>Brownish for iron nails, light green for copper sulphate solution</p> Signup and view all the answers

    Why is respiration classified as an exothermic process?

    <p>Energy is released during respiration</p> Signup and view all the answers

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