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 CHEMISTRY 0620/42 Paper 4 Theory (Extended) October/November hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE 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 HB 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 16. 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 15 printed pages and 1 blank page. IB16 11_0620_42/4RP [Turn over
2 1 Particles behave differently when in different physical states. (a) Solids have a fixed volume and a definite shape. Gases have no fixed volume and take the shape of the container. Describe the volume and shape of liquids [1] (b) Complete the table to show the separation, arrangement and movement of particles in each physical state. state separation of particles arrangement of particles movement of particles solid liquid touching one another randomly arranged move over one another gas [6] (c) Name the following changes of state. (i) Ice turning into water.... [1] (ii) Solid carbon dioxide turning directly into gaseous carbon dioxide at room temperature.... [1] [Total: 9]
3 3 2 This question is about atoms, ions and isotopes. (a) Define the term nucleon number.... [2] (b) Give the electronic structure of the following atom and ion. Na... P 3... [2] (c) State one medical use of radioactive isotopes.... [1] (d) What is meant by the term relative atomic mass?... [2] (e) Suggest why the relative atomic mass of chlorine is not a whole number.... [2] [Turn over
4 4 (f) Aluminium is a metal in Group III. Describe the bonding in aluminium. Include a labelled diagram and any appropriate charges in your answer. [3] [Total: 12]
5 5 3 Clean, dry air contains a small amount of carbon dioxide. (a) The percentages of the other gases present in clean, dry air are shown in the table. Complete the table by inserting the names of these gases. name of gas percentage present [2] (b) Oxides of nitrogen are atmospheric pollutants which can cause acid rain. Describe the formation of oxides of nitrogen and suggest how they can cause acid rain.... [3] (c) Methane contributes to the greenhouse effect. State two sources of methane [2] (d) Combustion and respiration add carbon dioxide to the atmosphere. Name one natural process which removes carbon dioxide from the atmosphere.... [1] [Total: 8] [Turn over
6 4 Dilute nitric acid behaves as a typical acid in some reactions but not in other reactions. 6 (a) Dilute nitric acid behaves as a typical acid when reacted with copper(ii) oxide and with copper(ii) carbonate. Describe what you would see if excess dilute nitric acid is added separately to solid samples of copper(ii) carbonate and copper(ii) oxide followed by warming the mixtures. copper(ii) carbonate copper(ii) oxide [4] (b) When dilute nitric acid is added to pieces of copper and heated, a reaction takes place and copper(ii) nitrate is formed. (i) Part of the chemical equation for the reaction between copper and dilute nitric acid is shown. Complete the chemical equation by inserting the formula of copper(ii) nitrate and balancing the equation....cu(s) + 8HNO 3 (aq)...(aq) + 4H 2 O(l) + 2NO(g) [2] (ii) How is the reaction of dilute nitric acid with copper different from that of a typical metal with a typical acid? [1] [Total: 7]
7 7 5 Chlorine, bromine and iodine are halogens. (a) Chlorine can be made in the laboratory by heating manganese(iv) oxide with concentrated hydrochloric acid. MnO 2 (s) + 4HCl (aq) MnCl 2 (aq) + 2H 2 O(l) + Cl 2 (g) Calculate the volume of 8.00 mol / dm 3 HCl (aq) needed to react with 3.48 g of MnO 2. moles of MnO 2 used moles of HCl needed... mol volume of HCl needed... mol... cm 3 [4] (b) A student bubbled chlorine gas into a test-tube containing aqueous potassium bromide. (i) Describe the colour change seen in the test-tube. from... to... [2] (ii) Complete the ionic equation for this reaction. Include state symbols. Cl 2 (g) +...Br (aq) [3] [Turn over
8 8 (c) When one mole of bromine, Br 2, reacts with one mole of propene, one organic product is formed. (i) Which part of the propene molecule reacts with bromine?... [1] (ii) What is the name of the type of reaction which takes place between bromine and propene?... [1] (d) When one mole of chlorine, Cl 2, reacts with one mole of propane, a mixture of two structural isomers is formed. (i) What is the name of the type of reaction which takes place between chlorine and propane?... [1] (ii) Explain what is meant by the term structural isomers [2] (iii) Draw the structure of two structural isomers formed when one mole of chlorine reacts with one mole of propane. [2]
9 (e) Iodine forms an oxide which has the composition by mass: I, 76.0%; O, 24.0%. 9 (i) Use this information to determine the empirical formula of this oxide of iodine. empirical formula... [3] (ii) The oxide of iodine in (e)(i) dissolves in water. Predict and explain the effect of adding Universal Indicator to an aqueous solution of this oxide of iodine. effect on Universal Indicator... explanation... [2] [Total: 21] [Turn over
10 10 6 Aluminium is a very important metal. Aluminium is extracted from its ore, bauxite, by electrolysis. Bauxite is an impure form of aluminium oxide, Al 2 O 3. (a) Describe how aluminium is extracted from bauxite. Include an ionic half-equation for the reaction at each electrode. description... ionic half-equation for the anode reaction... ionic half-equation for the cathode reaction... [5] (b) Explain why the anodes have to be replaced regularly.... [2] (c) Give two uses of aluminium and give a reason why aluminium is suitable for each use. use 1... reason... use 2... reason... [4] [Total: 11]
11 11 Question 7 starts on the next page. [Turn over
12 12 7 Proteins are a major constituent of food. Proteins are polymers. (a) What is a polymer?... [2] (b) Proteins can be converted into amino acids. (i) Name the type of chemical reaction which occurs when proteins are converted into amino acids.... [1] (ii) Suggest a condition needed to convert proteins into amino acids.... [1] (c) A colourless mixture of amino acids was separated by chromatography. Amino acid X has an R f value of 0.8. The chromatogram of the mixture after treatment with a locating agent is shown. solvent front baseline (i) How is an R f value calculated? R f = [1] (ii) On the diagram put a ring around the spot caused by amino acid X. [1]
13 13 (iii) Describe how you would perform a chromatography experiment to produce the chromatogram shown in (c). Assume you have been given the mixture of amino acids and a suitable locating agent. You are provided with common laboratory apparatus [3] [Turn over
14 14 (d) When one molecule of an amino acid A combines with one molecule of another amino acid B, two different dipeptide molecules could be formed. Draw the structures of the two different dipeptide molecules. Show all of the atoms and all of the bonds in the linkages. amino acid A amino acid B H O H O N C N C H O H H O H [3] [Total: 12]
15 15 BLANK PAGE Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. 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. Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.
16 16 Group The Periodic Table of Elements 1 H hydrogen 1 2 He 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 Hf 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 Hs 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 Hg 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 Ho holmium Es einsteinium 68 Er erbium Fm fermium 69 Tm thulium Md mendelevium 70 Yb ytterbium No nobelium 71 Lu lutetium Lr lawrencium PMT
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