9.4. Reactivity series
A subsection of Chemistry, 0620, through 9. Metals
Listing 10 of 452 questions
This question is about metals. Iron is extracted from its main ore in a blast furnace. waste gases slag air air A Coke and iron ore are added at the top of the blast furnace. Name one other substance that is added at the top of the blast furnace. Name the substance that leaves the blast furnace at A. Iron ore is mainly iron(oxide, Fe2O3. Name a substance that reduces iron(oxide to iron in the blast furnace. Temperatures inside a blast furnace can reach 2000 °C. Name two substances that react together, in the blast furnace, to produce this high temperature. Name two waste gases that leave the blast furnace.  Zinc is extracted from zinc blende. Name the main zinc compound that is present in zinc blende. When zinc is extracted, it is formed as a gas. The gaseous zinc is then converted into molten zinc. State the name of this physical change. Name the alloy that contains zinc and copper only. Copper has the following properties. ● It has a high melting point. ● It has a high density. ● It is a good conductor of electricity. ● It has variable oxidation states. ● It forms a basic oxide. ● It forms soluble salts. Give two properties from the list in which copper differs from GroupI elements.  Give two properties from the list in which copper is similar to GroupI elements.  
0620_s21_qp_43
THEORY
2021
Paper 4, Variant 3
View
This question is about zinc and compounds of zinc. Zinc is a metal. Give three physical properties of metals.  Zinc reacts with phosphorus to form zinc phosphide, Zn3P2. Complete the equation for this reaction. Zn + P → Zn3P2 Molten zinc chloride is electrolysed. The incomplete apparatus is shown. + – Complete the diagram by: ● completing the circuit to show the wires and power pack ● labelling the anode. Name the products formed at each electrode. positive electrode negative electrode  Zinc chloride reacts with water as shown. The solution formed is acidic. ZnCl 2 + 2H2O Zn(OH)2 + 2HCl State the meaning of the symbol . Choose the pH value which is acidic. Draw a circle around your chosen answer. pH 3 pH 7 pH 9 pH 14 A compound of zinc has the formula ZnC4H10. Complete the table to calculate the relative molecular mass of ZnC4H10. atom number of atoms relative atomic mass zinc 1 × 65 = 65 carbon hydrogen  relative molecular mass = 
0620_s22_qp_31
THEORY
2022
Paper 3, Variant 1
View
This question is about zinc and its compounds. Zinc is extracted from its ore which is mainly zincsulfide, ZnS. The steps for this extraction are shown. step 1 Zinc sulfide is converted into zinc oxide. step 2 The zincoxide is then reduced to zinc in a furnace. The zinc formed becomes a gas. step 3 The zinc gas is cooled to form molten zinc. Name the ore of zinc, which is mainly zincsulfide. Describe how zincsulfide is converted into zincoxide in step 1. Name the reducing agent used in step2. Explain why the zinc forms a gas in step2 inside the furnace. State the name of the physical change occurring when zinc gas is converted into molten zinc. Zinc sulfate crystals, ZnSO4•7H2O, are hydrated. Zinc sulfate crystals are made by reacting zinc carbonate with dilute sulfuric acid. The equation for the overall process is shown. ZnCO3 + H2SO4 + 6H2O → ZnSO4•7H2O + CO2 step 1 Large pieces of solid zinc carbonate are added to dilute sulfuric acid until the zinc carbonate is in excess. This forms aqueous zinc sulfate. step 2 The excess zinc carbonate is separated from the aqueous zinc sulfate. step 3 The aqueous zinc sulfate is heated until a saturated solution is formed. step 4 The saturated solution is allowed to cool and crystallise. step 5 The crystals are removed and dried. In step1, zinccarbonate is in excess when no more zinccarbonate dissolves. State one other observation that indicates the zinccarbonate is in excess in step1. Name a different substance, other than zinc carbonate, that can be added to dilute sulfuricacid to produce aqueous zincsulfate in step1. Step1 is repeated using powdered zinccarbonate instead of large pieces. All other conditions are kept the same. The rate of reaction increases. Give a reason why the rate of reaction increases. Explain your answer in terms of particles. Suggest what is observed when the solution is saturated in step3. The formula of zincsulfate crystals is ZnSO4•7H2O. Give the formula of the solid formed if the crystals are heated to dryness in step3. 
0620_s22_qp_41
THEORY
2022
Paper 4, Variant 1
View
Questions Discovered
452