9.6. Extraction of metals
A subsection of Chemistry, 0620, through 9. Metals
Listing 10 of 311 questions
Iron ore contains iron(oxide, Fe2O3. A blast furnace is used to extract iron from Fe2O3. Equations for some of the reactions in the blast furnace are shown. equation 1 C + O2 → CO2 equation 2 CaCO3 → CaO + CO2 equation 3 CaO + SiO2 → CaSiO3 Equation 1 shows the combustion of carbon in the blast furnace. Name the substance which provides the carbon for this reaction. State the purpose of the combustion of carbon in the blast furnace. Iron(oxide, Fe2O3, in iron ore is converted to iron when it reacts with carbon monoxide, CO, in the blast furnace. Calculate the percentage by mass of iron in iron(oxide, Fe2O3.  percentage = % State the name of the iron ore which consists mainly of iron(oxide. Describe how carbon monoxide is formed in the blast furnace. Write the symbol equation to show the reaction that occurs when iron(oxide is converted to iron in the blast furnace. Name the chemical process which happens to iron when iron(oxide is converted to iron in the blast furnace. State the type of reaction shown by equation 2. Explain why the reaction in equation 3 can be described as an acid–base reaction. State: ● the chemical name of SiO2 ● the common name given to CaSiO3 when it is formed in the blast furnace.  Aluminium cannot be extracted from its ore using a blast furnace. State why aluminium is not extracted from its ore using a blast furnace. Name the process used to extract aluminium from its ore. Both iron(oxide and aluminium oxide contain metal ions with a 3+ charge. Write the electronic configuration of an Al 3+ ion. Deduce the number of protons and electrons in an Fe3+ ion. protons electrons  
0620_m24_qp_42
THEORY
2024
Paper 4, Variant 2
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Use Iron is extracted from iron ore by heating the iron ore with coke and limestone. State the name of the ore from which iron is extracted. The coke burns in a blast of hot air to form carbon monoxide. Complete the equation for this reaction. C + O2 CO State an adverse effect of carbon monoxide on human health if it were to escape from the blast furnace. Near the top of the blast furnace, carbon monoxide reacts with iron ore. Fe2O3 + 3CO 2Fe + 3CO2 Write a word equation for this reaction. What type of chemical reaction is the conversion of Fe2O3 to 2Fe? Examiner's Use The limestone is converted to calcium oxide and carbon dioxide by the intense heat in the furnace. CaCO3 CaO + CO2 What type of chemical reaction is this? Name a use of limestone other than in the blast furnace. The calcium oxide reacts with silica and alumina in the iron ore. The product of this reaction collects on top of the molten iron at the bottom of the furnace. What is the name of this product? Put a ring around the correct answer. bauxite sand slag slaked lime The iron obtained from the blast furnace contains the following impurities. carbon manganese phosphorus silicon Which one of these elements is a transition element? What type of oxide is phosphorus oxide? Put a ring around the correct answer. acidic amphoteric basic neutral 50 tonnes of impure cast iron from the blast furnace contains 47 tonnes of iron. Calculate the percentage of the impurities in the cast iron.
0620_s06_qp_2
THEORY
2006
Paper 2, Variant 0
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Questions Discovered
311