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UK GCSE 2009 : Foundation Tier, Chemistry Paper 1

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Centre Number 71 Candidate Number General Certificate of Secondary Education 2009 Paper 1 Foundation Tier G1401 Science: Chemistry [G1401] THURSDAY 4 JUNE, MORNING TIME 1 hour. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Write your answers in the spaces provided in this question paper. Answer all five questions. INFORMATION FOR CANDIDATES The total mark for this paper is 90. Quality of written communication will be assessed in question 4(b)(iv). Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each question or part question. A Data Leaflet which includes a Periodic Table of the Elements is provided. For Examiner s use only Question Number 1 2 3 4 5 Total Marks 4535 Marks 1 (a) All playstations and games consoles contain a microchip made from the element silicon which has the symbol Si and atomic number 14. Examiner Only Marks Remark AP/Press Association Images (i) What is meant by the term element? ______________________________________________________ ___________________________________________________ [2] (ii) What is meant by the term atomic number? ___________________________________________________ [1] (b) (i) An atom of silicon contains protons, electrons and neutrons. Complete the table below to show the relative mass and relative charge of each particle and their position in the atom. Particle Relative mass Relative charge Position proton electron neutron [6] 4535 2 [Turn over (ii) Draw the electronic structure of a silicon atom. Examiner Only Marks Remark [2] (c) Silicon has 3 stable isotopes, 28Si, 29Si and 30Si. (i) Complete the table below to give the number of protons, electrons and neutrons present in one atom of each of the isotopes of silicon. Isotope Number of protons Number of electrons Number of neutrons 28Si 29Si 30Si [3] (ii) Explain what you understand by the term isotope. ______________________________________________________ ___________________________________________________ [2] (d) Silicon is rarely found in nature in its uncombined form but is found as silicon dioxide (sand). Silicon dioxide contains covalent bonds. (i) Suggest a formula for silicon dioxide. ___________________________________________________ [1] (ii) What is a covalent bond? ______________________________________________________ ___________________________________________________ [2] 4535 3 [Turn over (e) Silicon dioxide is heated with sodium carbonate and magnesium oxide to make glass. Sodium carbonate and magnesium oxide contain ionic bonding. Examiner Only Marks Remark Explain using full electronic structures how atoms of magnesium and atoms of oxygen form ions and bond to produce magnesium oxide. _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ _________________________________________________________ ______________________________________________________ [6] 4535 4 [Turn over 2 (a) Two iron nails were placed in separate test tubes containing water. The nail in test tube A was galvanised but the nail in test tube B was not. After a few days, the nail in test tube B had rusted. Examiner Only Marks Remark test tube rack A B (i) State one observation which would indicate that rusting is a chemical reaction. ______________________________________________________ ___________________________________________________ [1] (ii) What material is used to galvanise iron? ___________________________________________________ [1] (iii) State two other methods which could be used to prevent iron from rusting. 1. _________________________________________________ [1] 2. _________________________________________________ [1] (iv) The chemical name for rust is hydrated iron(III) oxide. What is meant by the term hydrated? ______________________________________________________ ___________________________________________________ [1] 4535 5 [Turn over (b) Copper metal is used for roofing. Copper reacts over time forming copper(II) oxide which reacts further with carbon dioxide in the air to form copper(II) carbonate. Acids will react with copper(II) carbonate. Examiner Only Marks Remark (i) Write a balanced symbol equation for the reaction of copper with oxygen in the air forming copper(II) oxide. ___________________________________________________ [3] (ii) Write a balanced symbol equation for the reaction of copper(II) oxide with carbon dioxide forming copper(II) carbonate. ___________________________________________________ [2] (iii) State the colours of: copper _________________________________ copper(II) oxide _________________________________ copper(II) carbonate _________________________________ [3] (iv) Name the acid which reacts with copper(II) carbonate to form a solution of copper(II) sulphate. ___________________________________________________ [1] 4535 6 [Turn over (c) Magnesium reacts with copper(II) sulphate solution. Examiner Only Marks Remark (i) Write a balanced symbol equation for the reaction. ___________________________________________________ [2] (ii) State one term used to describe this type of reaction. ___________________________________________________ [1] (iii) State two observations you would make during this reaction. ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] (iv) Name one other metal which reacts safely with copper(II) sulphate solution. ___________________________________________________ [1] 4535 7 [Turn over 3 (a) The diagram below shows the apparatus used to carry out the electrolysis of copper(II) sulphate solution. Graphite electrodes are used. Examiner Only Marks Remark + A copper(II) sulphate solution (i) What is meant by the term electrolysis? ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] (ii) State the name given to electrode A. ____________________________________________________ [1] (iii) What term is used to describe the copper(II) sulphate solution in this experiment? ___________________________________________________ [1] (iv) State two reasons why graphite is used for the electrodes. 1. ____________________________________________________ 2. _________________________________________________ [2] 4535 8 [Turn over (b) During the electrolysis of copper(II) sulphate solution, the ions present in the solution are attracted to the electrodes where they may be discharged. Examiner Only Marks Remark The table below gives some of the details of the ions and the electrode to which they are attracted. Complete the table. You may find your Data Leaflet useful in answering this question. Name of ion Attracted to positive electrode Attracted to negative electrode Formula of ion (including charge) Copper(II) SO2 4 H+ Hydroxide [6] 4535 9 [Turn over 4 Group VII of the Periodic Table is a group of reactive non-metals known as the halogens. Examiner Only Marks Remark (a) (i) Complete the table below giving the colour and physical state at room temperature of some of the halogens. Element Physical state at room temperature Colour Fluorine Chlorine gas Bromine red-brown Iodine [6] (ii) All of the halogens exist as diatomic molecules. What is meant by the term diatomic? ___________________________________________________ [1] (iii) Why is chlorine added to drinking water? ___________________________________________________ [1] (iv) Which of the elements in the table above is the least reactive? ___________________________________________________ [1] 4535 10 [Turn over (b) Chlorine gas reacts with hydrogen gas to form hydrogen chloride. Examiner Only Marks Remark (i) Write a balanced symbol equation for the reaction between chlorine gas and hydrogen gas. ___________________________________________________ [3] (ii) Suggest two safety measures which should be taken when carrying out the reaction. 1. ____________________________________________________ 2. _________________________________________________ [2] (iii) Hydrogen chloride is an acidic gas. What colour will damp universal indicator paper change to in the presence of hydrogen chloride? ___________________________________________________ [1] (iv) Describe a chemical test for hydrogen chloride gas and state the result for a positive test. ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [4] Quality of written communication 4535 [2] 11 [Turn over 5 (a) The table below shows information about different minerals. Examiner Only Marks Remark (i) Complete the table. (Relative atomic masses: C = 12; O = 16; S = 32; Ca = 40; Fe = 56; Hg = 201) Mineral Name of compound Calcite Formula of compound calcium carbonate Haematite Fe2O3 Cinnabar Relative Formula Mass HgS [6] (ii) The mineral titania is mainly composed of titanium oxide, TiO2. The calculation below shows how the percentage of titanium in titania may be calculated. Relative atomic mass of Ti % Titanium in titania = 100 Relative formula mass of TiO2 Calculate the percentage of titanium in titania. (Relative atomic masses: O = 16; Ti = 48) ___________________________ [2] 4535 12 [Turn over (b) The element silver forms many compounds containing the silver(I) ion, Ag+. Silver(I) oxide is used in batteries for submarines and in torpedoes. An atom of silver may be written: Examiner Only Marks Remark 108 Ag 47 (i) Write the formula of silver(I) oxide. ___________________________________________________ [1] (ii) What is the atomic number of silver? ___________________________________________________ [1] (iii) State the name and mass of the atom to which the mass of all other atoms is compared. Name ________________________________________________ Mass ______________________________________________ [2] THIS IS THE END OF THE QUESTION PAPER 4535 13 [Turn over Permission to reproduce all copyright material has been applied for. In some cases, efforts to contact copyright holders may have been unsuccessful and CCEA will be happy to rectify any omissions of acknowledgement in future if notified. 938-019-1 [Turn over

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