This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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You're on a roll — a) i) One of the substances in the slag Calcium silicate (CaSiO_3) ii) Another iron ore material used in the blast furnace Magnetite (Fe_3O_4) iii) One gas which is recycled Carbon monoxide (CO) b) Describe the process which leads to the formation of iron in the blast furnace Step 1: Coke reacts with hot air to form carbon dioxide. C(s) + O_2(g) CO_2(g) Step 2: Carbon dioxide reacts with more hot coke to form carbon monoxide, which is the main reducing agent. CO_2(g) + C(s) 2CO(g) Step 3: Carbon monoxide reduces the iron ore (haematite) to molten iron in stages. 3CO(g) + Fe_2O_3(s) 2Fe(l) + 3CO_2(g) At higher temperatures, coke can also directly reduce the iron oxide. 3C(s) + Fe_2O_3(s) 2Fe(l) + 3CO(g) c) State the purpose of limestone in the blast furnace Limestone (CaCO_3) decomposes to form calcium oxide (CaO), which acts as a flux. It reacts with acidic impurities like silicon dioxide (SiO_2) to form molten slag (calcium silicate, CaSiO_3), which can be easily removed. CaCO_3(s) CaO(s) + CO_2(g) CaO(s) + SiO_2(s) CaSiO_3(l) d) Give a reason why the melting point of iron obtained from the blast furnace is 1200^ while that of pure iron is 1535^ The iron obtained from the blast furnace (pig iron) contains impurities, mainly carbon (about 4%), which lower its melting point. Pure iron has a higher melting point because it lacks these impurities. e) State two uses of steel • Construction: Used in making beams, reinforcing bars, and structural frameworks for buildings and bridges. • Manufacturing: Used in making car bodies, machinery, tools, and household appliances. Mándame la siguiente 📸