Formation of Slaked Lime
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Questions and Answers

What is the general name of the reaction where two or more substances combine to form a single product?

  • Exothermic reaction
  • Decomposition reaction
  • Respiration reaction
  • Combination reaction (correct)

    • What is the characteristic of an exothermic reaction?

  • No heat is involved
  • Heat is released (correct)
  • Heat is neither released nor absorbed
  • Heat is absorbed

    • What is the reaction in which glucose combines with oxygen to produce energy?

  • Photosynthesis
  • Combustion
  • Respiration (correct)
  • Decomposition

    • What is the type of reaction that occurs when vegetable matter decomposes into compost?

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

    What is the product of the reaction between hydrogen gas and oxygen gas?

    <p>Water liquid</p> Signup and view all the answers

    What type of reaction involves the breakdown of a single substance into two or more products?

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

    What is the byproduct of the reaction between glucose and oxygen in the human body?

    <p>All of the above</p> Signup and view all the answers

    What is the type of reaction that occurs when coal is burned?

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

    What is the colour of the iron nail before it reacts with copper sulphate solution?

    <p>No colour</p> Signup and view all the answers

    What is the type of reaction that occurs between iron and copper sulphate solution?

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

    Why do zinc and lead displace copper from its compounds?

    <p>Because they are more reactive</p> Signup and view all the answers

    What is the product formed when sodium sulphate solution reacts with barium chloride solution?

    <p>Barium sulphate</p> Signup and view all the answers

    What is the name of the reaction that produces a precipitate?

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

    What happens to the blue colour of copper sulphate solution when it reacts with iron?

    <p>It fades</p> Signup and view all the answers

    What is the formula for iron sulphate?

    <p>FeSO4</p> Signup and view all the answers

    What is the reactant in the reaction between iron and copper sulphate solution?

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

    What is the product formed when calcium oxide reacts with water?

    <p>Calcium hydroxide</p> Signup and view all the answers

    What type of reaction is the reaction between calcium oxide and water?

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

    What is the purpose of using a solution of slaked lime for whitewashing walls?

    <p>To create a thin layer of calcium carbonate on the walls</p> Signup and view all the answers

    What is the chemical formula for marble?

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

    What is the reactant that reacts slowly with carbon dioxide in air to form calcium carbonate?

    <p>Calcium hydroxide</p> Signup and view all the answers

    What is the byproduct of the reaction between calcium hydroxide and carbon dioxide?

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

    What is the time period required for calcium carbonate to form on the walls after whitewashing?

    <p>Two to three days</p> Signup and view all the answers

    What is the term for the reaction in which a single product is formed from two or more reactants?

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

    What is the correct statement about the reaction 2PbO(s) + C(s) → 2Pb(s) + CO2(g)?

    <p>Carbon is getting oxidised.</p> Signup and view all the answers

    What type of reaction is the equation 2Fe2O3 + 2Al → Al2O3 + 2Fe?

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

    What is produced when dilute hydrochloric acid is added to iron fillings?

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

    Why should chemical equations be balanced?

    <p>To conserve mass</p> Signup and view all the answers

    What is the product of the reaction between hydrogen sulphide gas and oxygen?

    <p>Water and sulphur dioxide</p> Signup and view all the answers

    What is the correct balanced equation for the reaction between barium chloride and aluminium sulphate?

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

    What is the product of the reaction between potassium metal and water?

    <p>Potassium hydroxide and hydrogen gas</p> Signup and view all the answers

    What type of reaction is the equation HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O?

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

    What happens to magnesium when it burns in air?

    <p>It is oxidised</p> Signup and view all the answers

    What is the process called when a metal is attacked by substances around it?

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

    What is the term for the process by which iron gets coated with a reddish brown powder?

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

    What is the purpose of adding antioxidants to food?

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

    What is the result of fats and oils being oxidised?

    <p>They become rancid</p> Signup and view all the answers

    Why do chips manufacturers flush bags of chips with gas?

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

    What is the common problem associated with iron?

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

    What is the colour of the coating formed on copper when it corrodes?

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

    Study Notes

    Chemical Reactions

    • Calcium oxide (quick lime) reacts with water to form calcium hydroxide (slaked lime) releasing heat, which is a combination reaction: CaO(s) + H2O(l) → Ca(OH)2(aq) + Heat
    • A solution of slaked lime is used for whitewashing walls, and it reacts with carbon dioxide in the air to form a thin layer of calcium carbonate, giving a shiny finish to the walls: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)

    Combination Reactions

    • Combination reactions involve two or more substances combining to form a single product.
    • Examples of combination reactions include:
    • Burning of coal: C(s) + O2(g) → CO2(g)
    • Formation of water from hydrogen and oxygen: 2H2(g) + O2(g) → 2H2O(l)
    • Burning of natural gas: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

    Exothermic Reactions

    • Exothermic reactions release heat along with the formation of products.
    • Examples of exothermic reactions include:
    • Burning of coal: C(s) + O2(g) → CO2(g)
    • Burning of natural gas: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
    • Respiration: C6H12O6(aq) + 6O2(aq) → 6CO2(aq) + 6H2O(l) + energy

    Displacement Reactions

    • Displacement reactions involve one element displacing another element from a compound.
    • Examples of displacement reactions include:
    • Iron displacing copper from copper sulphate solution: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
    • Zinc displacing copper from copper sulphate solution: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
    • Lead displacing copper from copper chloride solution: Pb(s) + CuCl2(aq) → PbCl2(aq) + Cu(s)

    Double Displacement Reactions

    • Double displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.
    • Example: Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + NaCl(aq)

    Corrosion and Rancidity

    • Corrosion is the process of a metal being attacked by substances around it, such as moisture and acids, resulting in damage.
    • Examples of corrosion include rusting of iron, tarnishing of copper and silver, and damage to car bodies and bridges.
    • Rancidity is the process of oxidation of fats and oils, resulting in a change in their smell and taste.
    • Antioxidants are added to foods containing fats and oils to prevent oxidation.
    • Keeping food in air-tight containers helps to slow down oxidation.

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    Description

    This quiz is about the reaction of calcium oxide with water to form slaked lime, releasing heat. It involves the chemical equation CaO + H2O → Ca(OH)2 + Heat.

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