Iron ore contains iron(III) oxide, $$\(\mathrm{Fe}_{2} \mathrm{O}_{3}\)$$. A blast furnace is used to extract iron from $$\(\mathrm{Fe}_{2} \mathrm{O}_{3}\)$$. Equations for some of the reactions in the blast furnace are shown. Iron(III) oxide, $$\(\mathrm{Fe}_{2} \mathrm{O}_{3}\)$$, in iron ore is converted to iron when it reacts with carbon monoxide, CO , in the blast furnace. (i) Calculate the percentage by mass of iron in iron(III) oxide, $$\(\mathrm{Fe}_{2} \mathrm{O}_{3}\)$$. percentage = .......................... (ii) State the name of the iron ore which consists mainly of iron(III) oxide. ................................................................................................................................... 1] (iii) Describe how carbon monoxide is formed in the blast furnace. ................................................................................................................................... (iv) Write the symbol equation to show the reaction that occurs when iron(III) oxide is converted to iron in the blast furnace. ................................................................................................................................... (v) Name the chemical process which happens to iron when iron(III) oxide is converted to iron in the blast furnace. ...................................................................................................................................
Exam No：0620_m24_qp_42 Year：2024 Question No：1(b)
Answer:
Knowledge points:
3.2.1. Describe relative atomic mass, Ar, as the average mass of the isotopes of an element compared to 1/12th of the mass
3.2.2. Define relative molecular mass
3.2.3. Calculate reacting masses in simple proportions. Calculations will not involve the mole concept
9.6.1. Describe the ease in obtaining metals from their ores, related to the position of the metal in the reactivity series
9.6.2.1. the burning of carbon (coke) to provide heat and produce carbon dioxide
9.6.2.2. the reduction of carbon dioxide to carbon monoxide
9.6.2.3. the reduction of iron(III) oxide by carbon monoxide
9.6.2.4. the thermal decomposition of calcium carbonate / limestone to produce calcium oxide
9.6.2.5. the formation of slag Symbol equations are not required
9.6.3. State that the main ore of aluminium is bauxite and that aluminium is extracted by electrolysis
9.6.4.1.
9.6.4.2.
9.6.4.3.
9.6.4.4.
9.6.4.5.
9.6.5.1. the role of cryolite
9.6.5.2. why the carbon anodes need to be regularly replaced
9.6.5.3. the reactions at the electrodes, including ionic half-equations
Solution:
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