Gr 9 NATURAL SCIENCES: CH 4.3 Refining minerals
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Questions and Answers

What is the primary purpose of refining minerals?

  • To separate and purify the desired minerals from the ore (correct)
  • To convert iron into steel
  • To create a final product with a specific composition
  • To extract only iron from iron ore

    • What is the reducing agent used in the early technique of extracting iron?

  • Iron ore
  • Limestone
  • Charcoal (correct)
  • Coke

    • What is the approximate percentage of carbon in iron extracted from the blast furnace?

  • 1%
  • 4% (correct)
  • 7%
  • 10%

    • What is the chemical reaction for the reduction of iron ore in the blast furnace process?

    <p>2Fe₂O₃ + 3C → 4Fe + 3CO₂</p> Signup and view all the answers

    What happens to the carbon dioxide gas produced during the refining process?

    <p>It escapes as a gas</p> Signup and view all the answers

    What is the purpose of hot air blast in the blast furnace process?

    <p>To provide the oxygen needed for combustion</p> Signup and view all the answers

    What is the purpose of blowing pure oxygen through the molten iron during refining?

    <p>To reduce the carbon content</p> Signup and view all the answers

    What is the reacting material that forms slag in the blast furnace process?

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

    Where is the refined iron sent to after the refining process?

    <p>Steel manufacturing plants</p> Signup and view all the answers

    What is the final product of the blast furnace process?

    <p>Molten iron</p> Signup and view all the answers

    What is the primary use of slag in construction?

    <p>Building roads</p> Signup and view all the answers

    Which country is mentioned as one of the largest producers of iron ore globally?

    <p>South Africa</p> Signup and view all the answers

    What is the main purpose of the refining process?

    <p>To decrease the carbon content of iron</p> Signup and view all the answers

    Where is coal distributed to after the blast furnace process?

    <p>Coal power stations</p> Signup and view all the answers

    What is the primary industry that uses steel?

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

    What is the reason for reducing the carbon content in the iron extracted from the blast furnace?

    <p>To reduce its brittleness</p> Signup and view all the answers

    What is the byproduct of the reaction between carbon and oxygen during the refining process?

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

    What is the primary industry that uses the refined minerals as raw materials?

    <p>Multiple industries, including construction and manufacturing</p> Signup and view all the answers

    What happens to the molten iron during the refining process?

    <p>It is heated and pure oxygen is blown through it</p> Signup and view all the answers

    What is the purpose of the blast furnace process?

    <p>To extract pure iron from ore</p> Signup and view all the answers

    What is the fate of the carbon dioxide gas produced during the refining process?

    <p>It escapes into the atmosphere</p> Signup and view all the answers

    What is the use of coal in the blast furnace process?

    <p>To distribute to power stations</p> Signup and view all the answers

    What is the final product sent to steel manufacturing plants?

    <p>Refined iron</p> Signup and view all the answers

    What is the main difference between the early technique of extracting iron and the modern blast furnace process?

    <p>The temperature at which the reaction occurs</p> Signup and view all the answers

    What is the purpose of limestone in the blast furnace process?

    <p>To form slag</p> Signup and view all the answers

    What is the final product of the blast furnace process?

    <p>Molten iron</p> Signup and view all the answers

    What is the equation for the reduction of iron ore in the early technique of extracting iron?

    <p>2Fe₂O₃ + 3C → 4Fe + 3CO₂</p> Signup and view all the answers

    What is the name of the massive structure used in modern iron extraction?

    <p>Blast furnace</p> Signup and view all the answers

    What is the type of rock that contains iron atoms?

    <p>Both A and B</p> Signup and view all the answers

    What is the historical period associated with the early techniques of iron extraction?

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

    What is the primary function of the limestone in the blast furnace process?

    <p>To react with impurities and form slag</p> Signup and view all the answers

    What is the main difference between the reduction of iron ore in the early technique and the blast furnace process?

    <p>The temperature of the reaction</p> Signup and view all the answers

    What is the purpose of the bloomery in the early technique of extracting iron?

    <p>To facilitate the reduction of iron ore using charcoal</p> Signup and view all the answers

    What is the primary reason for the use of coke in the blast furnace process?

    <p>To facilitate the reduction of iron ore</p> Signup and view all the answers

    What is the fate of the molten slag in the blast furnace process?

    <p>It is used for road construction</p> Signup and view all the answers

    What is the primary advantage of the blast furnace process over the early technique of extracting iron?

    <p>It allows for mass production of iron</p> Signup and view all the answers

    What is the chemical state of the iron ore before the blast furnace process?

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

    What is the primary advantage of reducing the carbon content in iron extracted from the blast furnace?

    <p>To make iron more suitable for steel-making</p> Signup and view all the answers

    What is the primary role of pure oxygen in the refining process?

    <p>To react with carbon to form carbon dioxide</p> Signup and view all the answers

    What is the primary consequence of not refining the iron extracted from the blast furnace?

    <p>The iron becomes too brittle for use</p> Signup and view all the answers

    What is the primary purpose of distributing coal to power stations?

    <p>To generate electricity for the steel-making process</p> Signup and view all the answers

    What is the primary difference between the iron extracted from the blast furnace and the refined iron?

    <p>The refined iron has a lower carbon content</p> Signup and view all the answers

    What is the primary industry that uses the refined iron as a raw material?

    <p>Steel industry</p> Signup and view all the answers

    What is the primary reason for the distribution of slag to construction sites?

    <p>To use as a building material for roads</p> Signup and view all the answers

    What is the primary benefit of using steel in the construction industry?

    <p>It increases the strength of buildings</p> Signup and view all the answers

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