Chemical Reactions Overview
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Questions and Answers

What is produced when lead nitrate is heated?

  • Silver chloride and oxygen
  • Calcium carbonate and water
  • Barium iodide and potassium nitrate
  • Lead oxide and nitrogen dioxide (correct)

    • What causes silver chloride to turn grey upon sunlight exposure?

  • Reaction with potassium bromide
  • Decomposition of calcium hydroxide
  • Photodecomposition of silver chloride (correct)
  • Formation of lead iodide

    • What type of reaction is represented by the formation of barium sulfate as a white precipitate?

  • Decomposition reaction
  • Redox reaction
  • Combination reaction
  • Precipitation reaction (correct)

    • Which compound is formed when potassium iodide reacts with lead nitrate?

    <p>Lead iodide</p> Signup and view all the answers

    What is the result of the electrolysis of water?

    <p>Decomposition into oxygen and hydrogen</p> Signup and view all the answers

    What happens when an aqueous solution of sodium sulphate and barium chloride are mixed?

    <p>A white precipitate forms</p> Signup and view all the answers

    What is the color of ferrous sulphate crystals?

    <p>Light green</p> Signup and view all the answers

    What sound is produced when water is added to solid quick lime?

    <p>Hissing sound</p> Signup and view all the answers

    What observation is made when an iron nail is placed in a copper sulphate solution?

    <p>A brown deposit forms on the nail</p> Signup and view all the answers

    What is the result of adding potassium iodide solution to lead nitrate?

    <p>A yellow precipitate forms</p> Signup and view all the answers

    Which type of energy is required for decomposition reactions?

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

    What happens to silver chloride when exposed to sunlight?

    <p>It turns into silver</p> Signup and view all the answers

    What is produced when zinc reacts with silver nitrate?

    <p>Zinc nitrate and silver</p> Signup and view all the answers

    What is the mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water?

    <p>2:1</p> Signup and view all the answers

    Which statements are correct regarding the reaction 3Fe(s) + 4H2O (g) → Fe2O3(s) + 4H2(g)?

    <p>Water is acting as a reducing agent and iron is getting oxidized</p> Signup and view all the answers

    What gas is used to pack potato chips to prevent spoilage?

    <p>N2</p> Signup and view all the answers

    Which statement correctly describes the process of respiration?

    <p>An oxidation reaction which is exothermic</p> Signup and view all the answers

    What is an example of a double displacement reaction?

    <p>HCl + NaOH → NaCl + H2O</p> Signup and view all the answers

    Identify the reducing agent in the reaction 3 MnO2 + 4Al → 3 Mn + 2 Al2O3.

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

    What type of gas is evolved when lead nitrate crystals are heated?

    <p>Brown nitrogen dioxide</p> Signup and view all the answers

    Identify the type of reaction for ZnCO3(s) → ZnO(s) + CO2(g).

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

    Study Notes

    Chemical Reactions

    • Decomposition: A chemical reaction where one reactant breaks down to form multiple products.
      • Example: 2Pb(NO3)2 → 2PbO + 4NO2(g) + O2 (lead nitrate decomposes to lead oxide, nitrogen dioxide, and oxygen)
    • Double Displacement: A chemical reaction where two reactants exchange ions to form two new products.
      • Example: 2KI + Pb(NO3)2 → PbI2 + 2KNO3
      • Example: 2KBr + BaI2 → 2KI + BaBr2
    • Combination Reaction: A reaction where two or more reactants combine to form a single product.
      • Example: H2(g) + Cl2(g) → 2HCl (hydrogen gas and chlorine gas combine to form hydrochloric acid)
    • Displacement Reaction: A reaction where one element replaces another in a compound.
      • Example: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s) (iron replaces copper in copper sulfate)
    • Redox Reaction: A reaction involving the transfer of electrons.
      • Oxidation: Loss of electrons and increase in oxidation number.
      • Reduction: Gain of electrons and decrease in oxidation number.
      • Example: 3MnO2 + 4Al → 3Mn + 2Al2O3
        • Aluminum (Al) is the reducing agent, it reduces manganese oxide (MnO2) and gets oxidized.
        • Manganese oxide (MnO2) is the oxidizing agent, it oxidizes aluminum (Al) and gets reduced.

    Chemical Properties & Reactions

    • Silver Chloride: Turns gray when exposed to sunlight due to decomposition into silver and chlorine.
      • Chemical Equation: 2AgCl → 2Ag + Cl2
    • Lead Nitrate: When heated, it decomposes into lead oxide, nitrogen dioxide (brown gas), and oxygen gas.
      • Chemical Equation: 2Pb(NO3)2 → 2PbO + 4NO2 (g) + O2
    • Quicklime (Calcium Oxide): Reacts vigorously with water, releasing heat and forming calcium hydroxide.
      • Chemical Equation: CaO + H2O → Ca(OH)2
    • Iron Nail in Copper Sulfate Solution: Iron displaces copper in the solution, forming iron sulfate and depositing copper on the nail.
      • Chemical Equation: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
    • Calcium Carbonate: Decomposes when heated into calcium oxide and carbon dioxide gas.
      • Chemical Equation: CaCO3(s) → CaO(s) + CO2(g)

    Silver Chloride Properties

    • Silver chloride (AgCl) is a white, insoluble compound (precipitate) that turns grey when exposed to light.
      • Stored in dark-colored bottles to prevent decomposition.

    Iron Properties

    • Iron displaces copper from copper sulfate solution (Fe is more reactive than Cu).
      • Chemical Equation: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)

    Respiration

    • A chemical reaction that releases energy by breaking down glucose with oxygen.
      • Exothermic Reaction: Releases heat and light energy

    Miscellaneous

    • Potato chips: Packed in nitrogen gas (N2) to prevent spoilage and oxidation.
    • Barium sulfate: A white precipitate formed in a precipitation reaction.
    • Ferrous sulfate (FeSO4) A bluish-green colored crystal.

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    Chemical Reactions And Equations PDF

    Description

    Explore the different types of chemical reactions through this quiz. You'll learn about decomposition, double displacement, combination, displacement, and redox reactions with specific examples. Test your understanding of these fundamental concepts in chemistry.

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