Decomposition Reactions Quiz
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Questions and Answers

What happens to the colour of ferrous sulphate crystals upon heating?

  • It changes to yellow.
  • It remains green.
  • It changes to red.
  • It changes to brown. (correct)

    • Which of the following is a product of the decomposition of ferrous sulphate?

  • Carbon dioxide
  • Ferric oxide (correct)
  • Calcium carbonate
  • Hydrogen gas

    • What type of reaction is represented by the heating of ferrous sulphate?

  • Combustion reaction
  • Decomposition reaction (correct)
  • Single displacement reaction
  • Synthesis reaction

    • What is the characteristic smell produced when ferrous sulphate is heated?

    <p>Burning sulphur</p> Signup and view all the answers

    Which of the following gases is not produced from the thermal decomposition of ferrous sulphate?

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

    What is the solid product formed when calcium carbonate decomposes upon heating?

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

    What is another common name for calcium oxide?

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

    What is the process called when a compound decomposes upon heating?

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

    What is produced as a result of the double displacement reaction between sodium sulfate and barium chloride?

    <p>Sodium chloride and barium sulphate</p> Signup and view all the answers

    What is the term for a reaction that produces an insoluble substance?

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

    In the given reactions, what is the role of barium ions?

    <p>They combine with sulfate ions to form a precipitate</p> Signup and view all the answers

    What is formed on heating copper powder in the presence of oxygen?

    <p>Copper(II) oxide</p> Signup and view all the answers

    What is the primary gas emitted when lead nitrate is heated?

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

    Which of the following best describes a double displacement reaction?

    <p>A reaction that involves an exchange of ions between reactants</p> Signup and view all the answers

    Which component remains dissolved in the solution after mixing sodium sulfate and barium chloride?

    <p>Sodium chloride</p> Signup and view all the answers

    In the reaction where lead nitrate decomposes, what is produced alongside lead oxide?

    <p>Oxygen (O2)</p> Signup and view all the answers

    What does the presence of bubbles in the inverted test tubes indicate during the electrolysis of water?

    <p>Gas is being collected from the electrodes</p> Signup and view all the answers

    What is the appearance of the precipitate formed in the reaction between sodium sulfate and barium chloride?

    <p>White and insoluble</p> Signup and view all the answers

    During the copper oxidation process, what is the primary chemical change occurring?

    <p>Oxidation of copper by gaining oxygen</p> Signup and view all the answers

    What must be observed when a burning candle is brought near one of the test tubes after electrolysis?

    <p>The candle burns brighter, indicating the presence of oxygen</p> Signup and view all the answers

    What equipment is essential for performing the electrolysis of water?

    <p>Plastic mug with rubber stoppers</p> Signup and view all the answers

    What should be done cautiously during the test for gases produced in the electrolysis of water?

    <p>Bringing a burning candle close to the gas</p> Signup and view all the answers

    What change occurs when lead nitrate is heated?

    <p>It decomposes into lead oxide and gases</p> Signup and view all the answers

    What is the composition of the gas collectively produced during the electrolysis of water?

    <p>Hydrogen (H2) and oxygen (O2)</p> Signup and view all the answers

    What happens to the blue color of copper sulphate solution after immersing iron nails in it?

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

    Which chemical reaction takes place when iron is immersed in copper sulphate solution?

    <p>Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)</p> Signup and view all the answers

    What color does the iron nail acquire after being immersed in the copper sulphate solution?

    <p>It becomes brownish.</p> Signup and view all the answers

    Why does iron displace copper from copper sulphate solution?

    <p>Iron is more reactive than copper.</p> Signup and view all the answers

    Which of the following solutions acts as a source of copper in the displacement reaction?

    <p>Copper sulphate solution</p> Signup and view all the answers

    What type of reaction is demonstrated in the experiment with iron and copper sulphate?

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

    Which of these metals is likely to displace copper from copper sulphate solution?

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

    After performing the experiment, what should be compared in the test tubes?

    <p>The intensity of the blue color and the color of the iron nails.</p> Signup and view all the answers

    What is the primary cause of rusting in iron articles?

    <p>Exposure to moisture and acids</p> Signup and view all the answers

    What color is generally associated with the tarnishing of silver due to corrosion?

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

    What happens to fats and oils when they become rancid?

    <p>Their smell and taste change</p> Signup and view all the answers

    How can the oxidation process in food be slowed down?

    <p>By storing in airtight containers</p> Signup and view all the answers

    Which of the following is an example of corrosion?

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

    What is added to foods containing fats and oils to prevent rancidity?

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

    What is a likely outcome of corrosion on metal structures over time?

    <p>Financial costs due to damage</p> Signup and view all the answers

    What is the typical color of the coating formed on copper due to corrosion?

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

    Study Notes

    Ferrous Sulphate and its Decomposition

    • Ferrous sulphate crystals turn white upon heating due to the loss of water of crystallization.
    • The decomposition of ferrous sulphate produces ferric oxide (Fe2O3), sulphur dioxide (SO2) gas, and sulphur trioxide (SO3) gas.
    • The reaction represented by heating ferrous sulphate is a decomposition reaction.
    • The characteristic smell produced when ferrous sulphate is heated is a pungent, suffocating odor, characteristic of sulphur dioxide (SO2) gas.
    • Nitrogen gas (N2) is not produced from the thermal decomposition of ferrous sulphate.
    • The solid product formed when calcium carbonate (CaCO3) decomposes upon heating is calcium oxide (CaO).
    • Another common name for calcium oxide is quicklime.
    • The process called when a compound decomposes upon heating is called thermal decomposition.

    Reactions with Barium Chloride

    • The double displacement reaction between sodium sulfate (Na2SO4) and barium chloride (BaCl2) produces barium sulfate (BaSO4) as a precipitate and sodium chloride (NaCl) in solution.
    • A reaction that produces an insoluble substance is called a precipitation reaction.
    • In the reaction, barium ions (Ba2+) act as the cation in the precipitate formed, reacting with sulfate ions (SO42-) to form the insoluble barium sulfate.

    Reactions of Metals and Heat

    • When copper powder (Cu) is heated in the presence of oxygen (O2), copper oxide (CuO) is formed.
    • The primary gas emitted when lead nitrate (Pb(NO3)2) is heated is nitrogen dioxide (NO2).
    • A double displacement reaction involves the exchange of ions between two reactants, forming new products.
    • Sodium chloride (NaCl) remains dissolved in the solution after mixing sodium sulfate (Na2SO4) and barium chloride (BaCl2).
    • When lead nitrate (Pb(NO3)2) decomposes, lead oxide (PbO) is produced alongside nitrogen dioxide (NO2) and oxygen gas (O2).

    Electrolysis of Water

    • The presence of bubbles in the inverted test tubes during the electrolysis of water indicates the production of gases.
    • The precipitate formed in the reaction between sodium sulfate (Na2SO4) and barium chloride (BaCl2) is white in appearance.
    • The primary chemical change occurring during the copper oxidation process is the formation of copper oxide (CuO) on the copper surface.
    • When a burning candle is brought near one of the test tubes after electrolysis, a "pop" sound should be observed, signifying the presence of hydrogen gas (H2).
    • Electrolysis of water requires a DC power source, electrodes (usually platinum), and a container filled with water.
    • During the test for gases produced in the electrolysis of water, handling the test tubes containing the evolved gases should be done cautiously to avoid potential hazards.
    • When lead nitrate (Pb(NO3)2) is heated, it decomposes into lead oxide (PbO), nitrogen dioxide (NO2), and oxygen gas (O2).
    • The gas collectively produced during the electrolysis of water is a mixture of hydrogen gas (H2) and oxygen gas (O2), with hydrogen being produced at the cathode and oxygen at the anode.

    Displacement Reaction with Iron and Copper Sulphate

    • The blue color of copper sulfate solution (CuSO4) fades after immersing iron nails in it due to the displacement of copper ions (Cu2+) by iron ions (Fe2+).
    • The chemical reaction taking place when iron is immersed in copper sulfate solution is a displacement reaction where iron (Fe) displaces copper (Cu) from the copper sulfate solution.
    • The iron nail acquires a reddish-brown coating after being immersed in the copper sulfate solution, indicating the deposition of copper metal.
    • Iron displaces copper from copper sulfate solution because iron is more reactive than copper in the reactivity series.
    • Copper sulfate solution (CuSO4) acts as a source of copper in the displacement reaction.
    • The experiment with iron and copper sulfate demonstrates a single displacement reaction.
    • Zinc (Zn) is more reactive than copper (Cu) and can potentially displace copper from copper sulfate solution.
    • After performing the experiment, the color of solutions in the test tubes should be compared to observe the displacement of copper from the copper sulfate solution.

    Corrosion and its Effects

    • Rusting in iron articles is primarily caused by the reaction of iron (Fe) with oxygen (O2) in the presence of water (H2O).
    • The tarnishing of silver due to corrosion is generally associated with a black or dark grey coating.
    • When fats and oils become rancid, they undergo oxidation, which results in the formation of unpleasant odors and flavors.
    • The oxidation process in food can be slowed down by limiting exposure to air, moisture, and light.
    • An example of corrosion is the formation of rust on iron.
    • Antioxidants are often added to foods containing fats and oils to prevent rancidity.
    • Corrosion on metal structures over time can lead to weakening and eventually damage or failure of the structure.
    • The coating formed on copper due to corrosion is typically green in color, known as verdigris.

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    Jesc101 Chemical Reactions and Equations PDF

    Description

    Test your knowledge on various decomposition reactions including ferrous sulphate, calcium carbonate, and lead nitrate. Explore the thermal decomposition process and learn about the products formed during these reactions. This quiz will also touch on the electrolysis of water, further broadening your understanding of chemical reactions.

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