9.6. Extraction of metals
A subsection of Chemistry, 0620, through 9. Metals
Listing 10 of 311 questions
Iron is extracted from its ore using a blast furnace. In the blast furnace, coke burns in oxygen to produce heat energy and carbon dioxide. How is this carbon dioxide converted into carbon monoxide in the blast furnace? Calcium carbonate added to the blast furnace decomposes to form calcium oxide. Calcium oxide removes silicon(oxide impurities from the iron in a neutralisation reaction. Write a chemical equation for the reaction of calcium oxide with silicon(oxide. Suggest why it is a neutralisation reaction. The main impurity in iron obtained from the blast furnace is carbon. Why must the high levels of carbon be lowered before the iron becomes a useful material? How is the carbon removed from the iron? Zinc is extracted from its ore. The ore contains zinc sulfide. The zinc sulfide is roasted in air to produce zinc oxide and sulfur dioxide. Zinc is then obtained from the zinc oxide using a blast furnace. Give the name of the ore of zinc that contains zinc sulfide. Write a chemical equation for the reaction that takes place when zinc sulfide is roasted in air. Suggest why the sulfur dioxide should not be released into the atmosphere. The temperature inside the blast furnace in which zinc is extracted is about 1000 °C. The table gives some information about substances in the blast furnace in which zinc is extracted. substance melting point / °C boiling point / °C carbon sublimes at 4330 °C silicon(oxide zinc Use the data in the table to explain why the zinc obtained does not contain high levels of impurities such as silicon(oxide and carbon.
0620_m17_qp_42
THEORY
2017
Paper 4, Variant 2
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This question is about iron and its compounds. A student investigates the rate of reaction of 1 g of iron powder with 25 cm3 of hydrochloricacid of concentration 2.0 mol / dm3. The temperature is 20 °C. What effect do the following have on the initial rate of this reaction? Using hydrochloric acid of concentration 1.2 mol / dm3. All other conditions are kept the same. Using a piece of iron of mass 1 g. All other conditions are kept the same. Carrying out the experiment at 25 °C. All other conditions are kept the same. Siderite is an ore of iron. State the name of one other ore of iron. Siderite contains mainly iron(carbonate. Describe how to show that siderite contains a carbonate. Iron can be extracted from its oxide by reduction with carbon. The table shows how easy it is to reduce four metal oxides by heating with carbon. metal oxide ease of reduction with carbon bismuth(oxide only reduced above 250 °C iron(oxide only reduced above 650 °C tin(oxide only reduced above 500 °C titanium(oxide not reduced at 700 °C Use this information to put the metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  
0620_m18_qp_32
THEORY
2018
Paper 3, Variant 2
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Use Iron is a transition element. Which of the following statements about transition elements are correct? Tick three boxes. The metals are highly coloured e.g. yellow, green, blue. The metals have low melting points. Their compounds are highly coloured. Their compounds are colourless. The elements and their compounds are often used as catalysts. They have more than one oxidation state. In which Period in the Periodic Table is iron to be found? Use the Periodic Table to work out the number of protons and the number of neutrons in one atom of iron. number of protons = number of neutrons = Iron is extracted in a blast furnace. The list below gives some of the substances used or formed in the extraction. carbon monoxide coke iron ore limestone slag Which substance is a mineral containing largely calcium carbonate? Which substance is formed when impurities in the ore react with calcium oxide? Which substance is also called hematite? Examiner's Use State two functions of the coke used in the blast furnace. Most of the iron is converted into mild steel or stainless steel. Give one use for each. mild steel stainless steel
0620_s06_qp_3
THEORY
2006
Paper 3, Variant 0
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For Examiner's Use Choose from the list of compounds to answer questions to . calcium carbonate carbon dioxide hydrogen chloride iron(oxide lead(bromide methane sodium hydroxide Each compound can be used once, more than once or not at all. Name the compound which is a transition metal compound, produces brown fumes at the anode when electrolysed, is used to manufacture lime, dissolves in water to form an alkaline solution, is the main constituent of natural gas. For Examiner's Use At a high temperature iron(oxide is reduced by carbon. Fe2O3 + 3C 2Fe + 3CO Explain how the equation shows that iron(oxide is reduced by carbon. Complete these sentences about the extraction of iron using words from the list. bauxite blast converter haematite lime limestone sand slag Iron is extracted from by mixing the ore with coke and in a furnace. The iron ore is reduced to iron and impurities in the ore react with calcium oxide to form .
0620_s09_qp_2
THEORY
2009
Paper 2, Variant 0
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Questions Discovered
311