Thermal Decomposition Reactions
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Questions and Answers

Which of the following decomposes to ferric oxide, sulphur dioxide, and sulphur trioxide?

  • Lead nitrate
  • None of these
  • Calcium carbonate
  • Ferric sulphate (correct)
  • What is the name of the product formed in the thermal decomposition of calcium carbonate?

  • Washed lime
  • Cement
  • Slaked lime
  • Lime or quick lime (correct)
  • What is the term used to describe a decomposition reaction carried out by heating?

  • Electrolytic decomposition
  • Chemical decomposition
  • Physical decomposition
  • Thermal decomposition (correct)
  • What is the gas produced in the thermal decomposition of lead nitrate?

    <p>Nitrogen dioxide (NO2)</p> Signup and view all the answers

    What is the purpose of drilling holes at the base of a plastic mug in Activity 1.7?

    <p>To insert electrodes</p> Signup and view all the answers

    What is the product formed in the thermal decomposition of calcium carbonate that has many uses, including in the manufacture of cement?

    <p>Lime or quick lime</p> Signup and view all the answers

    What type of reactions are decomposition reactions classified as?

    <p>Endothermic reactions</p> Signup and view all the answers

    What is the source of energy for decomposition reactions?

    <p>Heat, light, or electricity</p> Signup and view all the answers

    What is the purpose of the activity involving barium hydroxide and ammonium chloride?

    <p>To demonstrate an endothermic reaction</p> Signup and view all the answers

    What is the characteristic of a reaction that absorbs energy?

    <p>It absorbs energy</p> Signup and view all the answers

    What is the name of the reaction that occurs when glucose combines with oxygen in the cells of our body?

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

    What is the type of reaction that occurs when a more reactive metal displaces a less reactive metal from its solution?

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

    What type of reaction is the decomposition of vegetable matter into compost?

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

    What is the purpose of cleaning the iron nails with sandpaper in Activity 1.9?

    <p>To remove the rust from the iron nails</p> Signup and view all the answers

    What is the result of heating ferrous sulphate crystals in Activity 1.5?

    <p>The colour of the crystals changes and a characteristic odour is released</p> Signup and view all the answers

    What is the general characteristic of a decomposition reaction?

    <p>A single reactant breaks down to give simpler products</p> Signup and view all the answers

    What is the formula for ferrous sulphate in Activity 1.5?

    <p>FeSO4.7H2O</p> Signup and view all the answers

    What is the product of the decomposition of ferrous sulphate in Activity 1.5?

    <p>Fe2O3 + SO2 + SO3</p> Signup and view all the answers

    Study Notes

    Decomposition Reaction

    • A decomposition reaction is a reaction where a single reactant breaks down into simpler products.
    • Example: Ferrous sulphate (FeSO4) decomposes into ferric oxide (Fe2O3), sulphur dioxide (SO2), and sulphur trioxide (SO3) on heating.
    • Ferric oxide is a solid, while SO2 and SO3 are gases.

    Thermal Decomposition

    • Thermal decomposition is a decomposition reaction carried out by heating.
    • Example: Decomposition of calcium carbonate (CaCO3) to calcium oxide (CaO) and carbon dioxide (CO2) on heating.
    • Calcium oxide is also known as lime or quick lime and has many uses, such as in the manufacture of cement.

    Decomposition Reaction Examples

    • Decomposition of lead nitrate (2Pb(NO3)2) to lead oxide (2PbO), nitrogen dioxide (4NO2), and oxygen (O2) on heating.
    • Decomposition of barium hydroxide with ammonium chloride to produce heat.

    Energy and Reactions

    • Decomposition reactions require energy, which can be in the form of heat, light, or electricity.
    • Reactions that absorb energy are known as endothermic reactions.
    • Example: Decomposition of barium hydroxide with ammonium chloride is an endothermic reaction.

    Displacement Reaction

    • Displacement reaction is a type of reaction where a more reactive element displaces a less reactive element from a compound.
    • Example: Iron nails (Fe) displacing copper from copper sulphate solution (CuSO4) to form iron sulphate and copper.

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    Description

    Learn about thermal decomposition reactions, including the decomposition of ferric oxide, calcium carbonate, and more. Understand the products formed and their uses in various industries.

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