9. Metals
A section of Chemistry, 0620
Listing 10 of 1272 questions
This question is about metals and compounds of metals. Iron reacts with dilute hydrochloricacid to form an iron(salt and a gas which pops with a lighted splint. Complete the word equation for this reaction. iron + hydrochloric acid +  Identify two correct statements about iron. Tick two boxes. Iron forms an alloy called steel. The commonest ore of iron is called bauxite. Iron is usually extracted from its ore by electrolysis. Iron is oxidised by carbon in the blast furnace. Both oxygen and water are needed for iron to rust.  The table compares the reactions of four metals with warm water and with steam. metal reaction with warm water reaction with steam chromium no reaction slow reaction copper no reaction no reaction iron very slow reaction slow reaction magnesium very slow reaction rapid reaction Put the four metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  Crystals of cobalt(chloride, CoCl 2•6H2O, can be prepared by reacting excess cobalt(carbonate powder with dilute hydrochloricacid. Describe how to prepare a sample of pure dry cobalt(chloride crystals after the reaction is complete. In your answer describe how to: ● ● remove the excess cobalt(carbonate from the reaction mixture ● ● crystallise the cobalt(chloride ● ● dry the crystals. A few drops of water were added to a sample of solid anhydrous cobalt(chloride, CoCl 2. The equation for the reaction is shown. CoCl 2 + 6H2O CoCl 2•6H2O State the meaning of the symbol . State the colour change observed when water is added to anhydrous cobalt(chloride. from to 
0620_w20_qp_32
THEORY
2020
Paper 3, Variant 2
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This question is about elements. aluminium carbon iron hydrogen oxygen silicon sodium sulfur Answer the following questions about these elements. Each element may be used once, more than once or not at all. Name the element that can be used as a fuel. Name the element that forms an oxide with a similar structure to diamond. Name the element that forms an amphoteric oxide. Name the element that has oxidation states of +2 and +3. Name the element extracted from bauxite. Name the element that has atoms with the electronic structure 2,6. Iron rusts when it is in contact with oxygen and water. Explain how sacrificial protection prevents rusting. State one other method of rust prevention. 
0620_w20_qp_41
THEORY
2020
Paper 4, Variant 1
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GroupI metals are very reactive. Transition elements are also metals but are less reactive than GroupI metals. State two physical properties of GroupI metals which are similar to those of transition metals.  Describe two ways in which the physical properties of GroupI metals are different from those of transition metals.  When GroupI metals are added to water they fizz and an alkaline solution forms. Name the gas given off. Identify the ion present in the solution which makes the solution alkaline. Write the chemical equation for the reaction between sodium and water. When the transition element iron is added to water the iron rusts. When an iron object is coated with a layer of zinc, rusting is prevented. Name this process of coating iron objects with a layer of zinc. Explain how completely coating an iron object with a layer of zinc prevents rusting. Rusting of iron ships can be prevented by attaching zinc blocks to the hull of the ship. Explain how this prevents rusting. 
0620_w20_qp_42
THEORY
2020
Paper 4, Variant 2
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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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