9.6. Extraction of metals
A subsection of Chemistry, 0620, through 9. Metals
Listing 10 of 311 questions
The diagram shows a blast furnace used in the extraction of iron. mixture of iron ore, coke and limestone molten slag molten iron E B C D Air is blown into the furnace. State which letter on the diagram, B, C, D or E, shows where air is blown into the furnace. Complete the chemical equation for the reduction of iron(oxide in the blast furnace. Fe2O3 + 3C → Fe + CO Explain how this equation shows that iron(oxide is reduced. Calciumcarbonate is added to the blast furnace. The calciumcarbonate undergoes thermal decomposition. Complete the word equation for this reaction. calcium carbonate → +  One of the products of this reaction reacts with impurities in the iron to form slag. Use the information in the diagram to suggest how you know that molten slag is less dense than molten iron. Use words from the list to complete these sentences about how steel is made from iron. acidic basic chlorides methane neutral nitrogen oxides oxygen sulfates A gas is blown through the molten iron. The name of this gas is . Acidic gases are formed. These acidic gases react with .  State one use of mild steel. Metals such as chromium are added to iron to make stainless steel. The symbol for an isotope of chromium is shown. 53Cr Deduce the number of electrons, neutrons and protons in one atom of this isotope of chromium. number of electrons number of neutrons number of protons  Chromium conducts electricity and is shiny. Give two other physical properties of chromium that are characteristic of all metals.  
0620_w21_qp_31
THEORY
2021
Paper 3, Variant 1
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Iron is extracted from iron ore in a blast furnace. Name an ore of iron. Complete the chemical equation for the reduction of iron(oxide in the blast furnace. Fe2O3 + CO → Fe + 3CO2 State the meaning of the term reduction. Calciumcarbonate is added to the blast furnace. The calciumcarbonate undergoes thermal decomposition. State the meaning of the term thermal decomposition. Iron can be made into stainless steel. Give one use of stainless steel. Describe one advantage of stainless steel compared with pure iron. The symbol for an isotope of iron is shown. 57Fe Deduce the number of electrons, neutrons and protons in one atom of this isotope of iron. number of electrons number of neutrons number of protons  Iron is a good conductor of heat and electricity. Give two other physical properties of iron that are characteristic of all metals.  Iron rusts. Name the two substances needed for iron to rust.  
0620_w21_qp_32
THEORY
2021
Paper 3, Variant 2
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This question is about metals. Table5.1 shows some properties of the Group I metals. Table 5.1 metal melting point in °C boiling point in °C atomic volume in cm3 / mol observations on reaction with water lithium 12.9 bubbles form slowly but no flame sodium 23.7 potassium bubbles form very rapidly and flame seen rubidium 55.8 explodes Use the information in Table5.1 to predict: the melting point of rubidium ���������������������������������������������������������������������������������������� the atomic volume of potassium ����������������������������������������������������������������������������������� the observations when sodium reacts with water the physical state of sodium at 1300 °C. Give a reason for your answer. physical state reason  Iron is extracted in a blast furnace by reduction of iron(oxide. In the first step, carbon burns in air to form carbondioxide. State the percentage of oxygen in clean, dry air. In the second step, carbonmonoxide is produced by the reaction of carbon dioxide with carbon. CO2 + C → 2CO Choose the correct statement about this reaction. Tick (✓) one box. the carbon dioxide is oxidised and the carbon is reduced both carbon dioxide and carbon are oxidised the carbon dioxide is reduced and the carbon is oxidised both carbon dioxide and carbon are reduced  In the third step, iron(oxide is reduced by carbon monoxide. The reaction is exothermic. State the meaning of the term exothermic. Calciumcarbonate is added to the blast furnace. The calciumcarbonate breaks down as shown. high temperature calcium carbonate calcium oxide + carbon dioxide Name the type of chemical reaction that takes place. Complete this sentence about the calciumoxide that is produced in the blast furnace. Calciumoxide reacts with impurities in the iron ore to form . Table5.2 gives the observations when four different metals react with air. Table 5.2 metal observations cerium forms an oxide layer slowly without heating copper forms an oxide layer only when heated gold does not form an oxide layer even when heated rubidium forms an oxide layer quickly without heating Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  
0620_w23_qp_33
THEORY
2023
Paper 3, Variant 3
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Questions Discovered
311