Cambridge International Examinations Cambridge International General Certificate of Secondary Education
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1 Cambridge International Examinations Cambridge International General Certificate of Secondary Education * * CEMISTRY 0620/43 Paper 4 Theory (Extended) October/November hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ TESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use an B pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. A copy of the Periodic Table is printed on page 12. You may lose marks if you do not show your working or if you do not use appropriate units. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate. This document consists of 12 printed pages. IB17 11_0620_43/5RP [Turn over
2 2 1 Substances can be classified as elements, compounds or mixtures. State whether each of the following is an element, a compound or a mixture. (a) brass... [1] (b) gold... [1] (c) butane... [1] (d) air.. [Total: 4]
3 Cl 2 [3] 3 2 (a) Define the term molecule. Define the term element. (b) The table shows the composition of four atoms or ions, A, B, C and D. number of protons What is the atomic number of A? number of neutrons number of electrons A B C D What is the nucleon number of B? Which of A, B, C and D are isotopes of each other? (iv) Which of A, B, C and D are atoms? (v) Which of A, B, C and D are positive ions? (c) Complete the table. number of protons number of electrons Na S 2 [Total: 11] [Turn over
4 3 Iron is extracted from its ore using coke in a blast furnace. waste gases 4 raw materials: coke, iron ore, limestone air air slag molten iron (a) Name the ore of iron which is mainly iron(iii) oxide.... (b) Describe the reactions occurring in the blast furnace. In your answer, include two reasons for using coke in the blast furnace, a chemical equation for the reduction of iron(iii) oxide, an explanation for using limestone in the blast furnace [6]
5 5 (c) Describe the bonding in iron. Include a diagram in your answer.... [3] Use your diagram in (c) to explain why iron is malleable. Iron containing a small amount of carbon is known as steel. Explain why steel is less malleable than iron. (d) When iron is added to dilute sulfuric acid, an aqueous solution of iron(ii) sulfate is formed as one of the products. Write a chemical equation for the reaction. When iron(iii) oxide is added to dilute sulfuric acid, an aqueous solution of iron(iii) sulfate is formed as one of the products. Write a chemical equation for the reaction.... [3] [Turn over
6 6 (e) Aqueous sodium hydroxide, aqueous potassium iodide and aqueous acidified potassium manganate(vii) are added to aqueous solutions of iron(ii) sulfate and iron(iii) sulfate. Iron(II) ions, Fe 2+, are reducing agents in aqueous solution. Iron(III) ions, Fe 3+, are oxidising agents in aqueous solution. Complete the table. reagent aqueous sodium hydroxide observations with aqueous iron(ii) sulfate green precipitate observations with aqueous iron(iii) sulfate aqueous potassium iodide aqueous acidified potassium manganate(vii) no change [4] [Total: 22] 4 ydrogen and oxygen react together in a hydrogen fuel cell. A hydrogen fuel cell is shown in the diagram. V hydrogen 2 oxygen O 2 electrolyte water membrane (a) Name the process by which oxygen is obtained from air....
7 7 (b) In a hydrogen fuel cell, the hydrogen molecules are converted into hydrogen ions, +, according to the ionic half-equation shown e What type of reaction does this ionic half-equation represent? What type of substance reacts by donating hydrogen ions, +? (c) Write a chemical equation for the overall reaction that occurs in a hydrogen fuel cell.... (d) ydrogen fuel cells are being developed as alternatives to petrol engines in cars. Give one advantage of hydrogen fuel cells compared to petrol engines. Give one disadvantage of hydrogen fuel cells compared to petrol engines. (e) Some fuel cells use ethanol, C 2 5 O, instead of hydrogen. Carbon dioxide and water are products of the reaction in an ethanol fuel cell. Write a chemical equation for the overall reaction occurring in an ethanol fuel cell. State an environmental problem caused by the release of carbon dioxide into the atmosphere. Name the process by which ethanol can be manufactured from a renewable resource. (f) Name the process occurring when electrical energy is used to break down an ionic compound.... [Total: 11] [Turn over
8 5 (a) Name the products formed when sodium nitrate is heated. 8 When copper(ii) nitrate, Cu(NO 3 ) 2, undergoes thermal decomposition, three products are formed. One of the products is nitrogen dioxide, NO 2. Write a chemical equation for the thermal decomposition of copper(ii) nitrate. (b) The chemical equation shows the equilibrium between dinitrogen tetroxide (N 2 O 4, a colourless gas) and nitrogen dioxide (NO 2, a brown gas). N 2 O 4 (g) colourless 2NO 2 (g) brown A mixture of dinitrogen tetroxide and nitrogen dioxide is allowed to reach equilibrium in a closed gas syringe. In chemistry, what is meant by the term equilibrium? If the equilibrium mixture is heated at constant pressure, a darker brown colour is seen inside the gas syringe. What does this information indicate about the decomposition of dinitrogen tetroxide? Explain your answer in terms of the position of the equilibrium. Suggest what you would see if the pressure on the equilibrium mixture were increased at constant temperature. Explain your answer in terms of the position of the equilibrium. [Total: 10]
9 6 (a) Alkanes and alkenes are two homologous series of hydrocarbons. 9 What is meant by the term hydrocarbon? What is the general formula of the homologous series of alkanes,... alkenes?... [2] Other than having a general formula, state two characteristics of a homologous series [2] (iv) The structure of an alkene molecule with the molecular formula C 4 8 is shown. C C C C Draw the structure of a different alkene molecule with the molecular formula C 4 8. Show all of the atoms and all of the bonds. [1] (v) What term describes molecules with the same molecular formula but different structural formulae? [Turn over
10 10 (b) 25 cm 3 of a gaseous hydrocarbon, C x y, were burnt in 150 cm 3 of oxygen. This was an excess of oxygen. After cooling, the volume of the gases remaining was 100 cm 3. This consisted of 75 cm 3 of carbon dioxide and 25 cm 3 of unreacted oxygen. The water that was produced in the reaction was liquid. All volumes were measured at the same temperature and pressure. What is meant by an excess of oxygen? What was the volume of oxygen that reacted with the hydrocarbon?... cm 3 [1] Complete the table to show the smallest whole number ratio of volumes. volume of hydrocarbon reacted : volume of oxygen reacted : volume of carbon dioxide produced smallest whole number ratio of volumes : : [1] (iv) Use your answer to (b) to balance the chemical equation. Deduce the formula of the hydrocarbon. C x y (g) +...O 2 (g)...co 2 (g) O(l) formula of the hydrocarbon =... [2] [Total: 12]
11 7 (a) Carbon and silicon are elements in Group IV of the Periodic Table. Carbon dioxide from the air moves into green plants and is converted into carbohydrates. 11 Name the process by which carbon dioxide molecules move through the air into green plants. Explain why silicon(iv) oxide cannot move through the air in the same way that carbon dioxide can. Name the process by which carbon dioxide is converted into glucose, C 6 12 O 6, in green plants. Give two conditions required for this process to occur. Write a chemical equation for the reaction which occurs. name of process... condition 1... condition 2... chemical equation... [5] (b) Starch is a natural polymer made from glucose. What type of polymerisation occurs when glucose is converted into starch? What type of reaction occurs when starch is converted into glucose? Starch can be represented as shown. O O O O Complete the diagram below to represent the structure of the glucose monomer. [1] [Total: 10] To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at after the live examination series.
12 12 Group The Periodic Table of Elements 1 hydrogen 1 2 e helium 4 I II III IV V VI VII VIII 3 Li lithium 7 4 Be beryllium 9 atomic number atomic symbol Key name relative atomic mass 11 Na sodium Mg magnesium K potassium Ca calcium Rb rubidium Sr strontium Cs caesium Ba barium Fr francium 88 Ra radium 5 B boron Al aluminium Ga gallium In indium Tl thallium C carbon Si silicon Ge germanium Sn tin Pb lead Ti titanium Zr zirconium f hafnium Rf rutherfordium 23 V vanadium Nb niobium Ta tantalum Db dubnium 24 Cr chromium Mo molybdenum W tungsten Sg seaborgium 25 Mn manganese Tc technetium 75 Re rhenium Bh bohrium 26 Fe iron Ru ruthenium Os osmium s hassium 27 Co cobalt Rh rhodium Ir iridium Mt meitnerium 28 Ni nickel Pd palladium Pt platinum Ds darmstadtium 29 Cu copper Ag silver Au gold Rg roentgenium 30 Zn zinc Cd cadmium g mercury Cn copernicium 114 Fl flerovium 116 Lv livermorium 7 N nitrogen P phosphorus As arsenic Sb antimony Bi bismuth O oxygen S sulfur Se selenium Te tellurium Po polonium 9 F fluorine Cl chlorine Br bromine I iodine At astatine 10 Ne neon Ar argon Kr krypton Xe xenon Rn radon 21 Sc scandium Y yttrium lanthanoids actinoids 57 La lanthanum Ac lanthanoids actinoids The volume of one mole of any gas is 24 dm 3 at room temperature and pressure (r.t.p.). actinium 58 Ce cerium Th thorium Pr praseodymium Pa protactinium Nd neodymium U uranium Pm promethium 93 Np neptunium 62 Sm samarium Pu plutonium 63 Eu europium Am americium 64 Gd gadolinium Cm curium 65 Tb terbium Bk berkelium 66 Dy dysprosium Cf californium 67 o holmium Es einsteinium 68 Er erbium Fm fermium 69 Tm thulium Md mendelevium 70 Yb ytterbium No nobelium 71 Lu lutetium Lr lawrencium
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