2 Exercise 7: The Conditions in the Blast Furnace 1. What is the role of coke in the blast furnace?2. What is the role of limestone in the blast furnace?3. Which ore of iron is commonly used in the blast furnace?4. Why is it called a blast furnace?5. What do we call the layer of impurities that forms at the base of the blast furnace above the liquid iron?It acts as a reducing agentLimestone helps to remove acidic impuritiesHaematiteBecause hot air is ‘blasted into the furnace’Slag
3 Exercise 8: Direct Reduction 1. Which compound does haematite mainly consist of?2. What is the chemical formula of this compound?3. A small amount of this compound is directly reduced by the coke, what does reduced mean in this instance?4. Write a word equation for this reaction.5. Write a chemical equation for the word equation above.Iron (III) oxideFe2O3The oxygen is removed from the compoundCarbon(s) + iron (III) oxide(s) iron(l) + carbon dioxide(g)2Fe2O3(s) + 3C(s) 4Fe(l) + 3CO2(g)
4 Exercise 9: Limestone1. Limestone is added to the blast furnace to remove acidic impurities. What is the name and chemical formula of the compound that limestone mainly consists of?2. In the blast furnace this compound undergoes thermal decomposition. Write a word equation for this reaction.3. What is the chemical equation for this reaction?4. Calcium oxide reacts with the impurity silicon dioxide. Write the chemical equation for this chemical reaction.Calcium carbonate - CaCO3Calcium carbonate(s) calcium oxide(s) + carbon dioxide(g)CaCO3(s) CaO(s) + CO2(g)CaO(s) + SiO2(s) CaSiO3(l)
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