Balancing Chemical Equations
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Questions and Answers

What type of reaction is represented by the chemical equation CaO(s) + H2O(l) → Ca(OH)2(aq) + Heat?

  • Double displacement reaction
  • Decomposition reaction
  • Single displacement reaction
  • Combination reaction (correct)
  • Which product is formed when calcium hydroxide reacts with carbon dioxide according to the chemical equation Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)?

  • Calcium oxide
  • Carbon monoxide
  • Carbonic acid
  • Calcium carbonate (correct)
  • What is the main purpose of using slaked lime (calcium hydroxide) for whitewashing walls?

  • To give a shiny finish to the walls (correct)
  • To remove dirt and grime from the walls
  • To create a chemical barrier on the walls
  • To prevent moisture absorption by the walls
  • Which general type of reaction is represented by the burning of coal according to the chemical equation C(s) + O2(g) → CO2(g)?

    <p>Combination reaction</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 remains the same before and after a chemical reaction</p> Signup and view all the answers

    What does a 'skeletal chemical equation' for a reaction represent?

    <p>An unbalanced chemical equation</p> Signup and view all the answers

    What is the law of conservation of mass as it applies to chemical reactions?

    <p>The total mass of elements in the products must be equal to the total mass of elements in the reactants</p> Signup and view all the answers

    What does the burning of magnesium in air produce, as represented by equation (1.2)?

    <p>Magnesium oxide</p> Signup and view all the answers

    What is the result when dilute hydrochloric acid is added to iron fillings?

    <p>Hydrogen gas and iron chloride are produced</p> Signup and view all the answers

    What is the purpose of balancing chemical equations?

    <p>To ensure conservation of mass</p> Signup and view all the answers

    What is the balanced chemical equation for the reaction: Hydrogen gas combines with nitrogen to form ammonia?

    <p>2H2 + N2 → 2NH3</p> Signup and view all the answers

    What is the balanced chemical equation for the reaction: Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate?

    <p>BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4</p> Signup and view all the answers

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