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9.6. Extraction of metals
A subsection of Chemistry, 0620, through 9. Metals
Listing 10 of 311 questions
This question is about iron and iron compounds. Name the main ore of iron. In a blast furnace used for the extraction of iron, carbon reacts with oxygen from the air to form carbon monoxide. Complete the chemical equation for this reaction. C + 2CO  In the hotter parts of the furnace, carbon reacts with the iron(oxide present in the iron ore. 3C + Fe2O3 3CO + 2Fe How does this equation show that carbon is oxidised? Limestone is added to the blast furnace. The limestone is converted into calcium oxide and carbon dioxide. The reaction is endothermic. heat CaCO3 CaO + CO2 What type of chemical reaction is this? What type of oxide is calcium oxide? Give a reason for your answer. Iron is a metal. Give three physical properties that are characteristic of metals.  The structure of a compound of iron is shown. C O C O O C CO OC CO OC CO OC Fe Fe Deduce the molecular formula of this compound to show the number of iron, carbon and oxygen atoms. 
0620_s19_qp_31
THEORY
2019
Paper 3, Variant 1
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This question is about iron and compounds of iron. Iron can be converted into steel in a basic oxygen converter. Oxygen is blown into the impure molten iron to remove some of the impurities. Oxygen reacts with the carbon in the impure iron to form carbon dioxide. Write a chemical equation for this reaction. Basic oxides in the lining of the converter react with impurities such as sulfurdioxide to form slag. What type of oxide is sulfur dioxide? Give a reason for your answer. Iron(chloride, Fe2Cl 6, is produced when iron is heated with chlorine. The diagram shows the apparatus used. Draw an arrow on the diagram to show where the apparatus is heated. dry chlorine iron wire in a ceramic boat flask iron(chloride collects here drying agent  Iron(chloride undergoes sublimation. What is meant by the term sublimation ? Suggest why the iron(chloride is collected in the flask and not in the ceramic boat. At higher temperatures, iron(chloride decomposes. heat Fe2Cl 6 2FeCl 2 + Cl 2 Explain why this is a decomposition reaction. Iron reacts with chlorine and other halogens. Name two other substances which react with iron.  Describe a test for iron(ions. test observations  
0620_s19_qp_32
THEORY
2019
Paper 3, Variant 2
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This question is about iron and iron compounds. Iron can be extracted from iron ore by reduction with carbon in a blast furnace. Which one of these substances is an ore of iron? Draw a circle around the correct answer. bauxite graphite hematite limestone  The equation shows one of the reactions occurring in the blast furnace. 2Fe2O3 + 3C 4Fe + 3CO2 How does this equation show that Fe2O3 is reduced? The carbon dioxide formed can be reduced by carbon. CO2 + C 2CO The energy level diagram for this reaction is shown. energy progress of reaction CO2 + C 2CO Explain how this diagram shows that the reaction is endothermic. Explain why iron is extracted by reduction with carbon and not by electrolysis. Refer to the position of iron in the reactivity series in your answer. Describe three properties of iron that show that it is a transition element and not a GroupI element. 1 2 3  Iron reacts with chlorine to form iron(chloride, Fe2Cl 6. Balance the chemical equation for this reaction. Fe + Cl 2 Fe2Cl 6  At 400 °C Fe2Cl 6 molecules decompose. Fe2Cl 6 2FeCl 3 What is meant by the symbol ? The structure of an ion is shown. Fe CN CN CN CN NC NC 4– Deduce the molecular formula of this ion to show the number of iron, carbon and nitrogen atoms. 
0620_s19_qp_33
THEORY
2019
Paper 3, Variant 3
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Questions Discovered
311