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Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Atomic Structure Question Paper 1 Level IGCSE Subject Chemistry (4402) Exam Board AQA Unit C2 Topic Sub-Topic Atomic Structure; Analysis and Quantitative Chemistry Atomic Structure Booklet Question Paper 1 Time Allowed: 55 Score: / 55 Percentage: /100 minutes Grade Boundaries: Page 1 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Q1.This question is about magnesium. (a) (i) The electronic structure of a magnesium atom is shown below. Use the correct answer from the box to complete each sentence. electrons neutrons protons shells The nucleus contains protons and .................. The particles with the smallest relative mass that move around the nucleus are called .................. Atoms of magnesium are neutral because they contain the same number of electrons and .................. (3) (ii) A magnesium atom reacts to produce a magnesium ion. Which diagram shows a magnesium ion? Tick ( ) one box. Page 2 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (1) (b) Magnesium and dilute hydrochloric acid react to produce magnesium chloride solution and hydrogen. Mg(s) + 2 HCl(aq) (i) MgCl2(aq) + H2(g) State two observations that could be made during the reaction. 1 ............................................................................................................ ............................................................................................................... 2 ............................................................................................................ ............................................................................................................... (2) (ii) In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate. Describe a method for making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acid. In your method you should name the apparatus you will use. You do not need to mention safety. ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... Page 3 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... (6) (Total 12 marks) Q2.This question is about atoms. Atoms contain electrons, neutrons and protons. (a) (i) Which of these particles has a positive charge? Tick ( ) one box. Electron Neutron Proton (1) (ii) Which of these particles does not have an electrical charge? Tick ( ) one box. Electron Page 4 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Neutron Proton (1) (b) How are the elements in the periodic table arranged? Tick ( ) one box. In order of increasing atomic number In order of increasing mass number In order of increasing reactivity (1) (c) The diagram shows the arrangement of the electrons in an atom of fluorine. (i) How many protons are in an atom of fluorine? Page 5 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Tick ( ) one box. 2 7 9 (1) (ii) The boiling point of fluorine is −188 °C. What is the state of fluorine at room temperature? Tick ( ) one box. Solid Liquid Gas (1) (d) Fluorine reacts with copper to form an ionic compound. (i) Explain, in terms of electrons and electronic structure, what happens to a fluorine atom when it reacts with copper. Use the diagram above to help you to answer this question. Page 6 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... (2) (ii) Describe a chemical test which would show that a solution contains copper(II) ions. ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... (2) (Total 9 marks) Q3.Some students were investigating the rate at which carbon dioxide gas is produced when metal carbonates react with an acid. One student reacted 1.00 g of calcium carbonate with 50 cm 3, an excess, of dilute hydrochloric acid. The apparatus used is shown in Diagram 1. Diagram 1 Page 7 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Dilute hydrochloric acid (a) Complete the two labels for the apparatus on the diagram. (2) (b) The student measured the volume of gas collected every 30 seconds. The table shows the student’s results. Time in seconds Volume of carbon dioxide collected in cm3 30 104 60 (i) 90 198 120 221 150 232 180 238 210 240 240 240 Diagram 2 shows what the student saw at 60 seconds. Diagram 2 Page 8 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ What is the volume of gas collected? Volume of gas = .................... cm3 (1) (ii) Why did the volume of gas stop changing after 210 seconds? ............................................................................................................... ............................................................................................................... (1) (c) Another student placed a conical flask containing 1.00 g of a Group 1 carbonate (M2CO3) on a balance. He then added 50 cm3, an excess, of dilute hydrochloric acid to the flask and measured the mass of carbon dioxide given off. The equation for the reaction is: M2CO3 + 2HCl 2MCl + H2O + CO2 The final mass of carbon dioxide given off was 0.32 g. (i) Calculate the amount, in moles, of carbon dioxide in 0.32 g carbon dioxide. Relative atomic masses (Ar): C = 12; O = 16 ............................................................................................................... ............................................................................................................... ............................................................................................................... Moles of carbon dioxide = .................... moles (2) Page 9 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (ii) How many moles of the metal carbonate are needed to make this number of moles of carbon dioxide? ............................................................................................................... ............................................................................................................... Moles of metal carbonate = .................... moles (1) (iii) The mass of metal carbonate used was 1.00 g. Use this information, and your answer to part (c) (ii), to calculate the relative formula mass (Mr) of the metal carbonate. If you could not answer part (c) (ii), use 0.00943 as the number of moles of metal carbonate. This is not the answer to part (c) (ii). ............................................................................................................... ............................................................................................................... Relative formula mass (Mr) of metal carbonate = .................... (1) (iv) Use your answer to part (c) (iii) to calculate the relative atomic mass (Ar) of the metal in the metal carbonate (M2CO3) and so identify the Group 1 metal in the metal carbonate. If you could not answer part (c) (iii), use 230 as the relative formula mass of the metal carbonate. This is not the answer to part (c) (iii). To gain full marks, you must show your working. ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... Relative atomic mass of metal is ......................................................... Identity of metal ..................................................................................... (3) Page 10 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (d) Two other students repeated the experiment in part (c). (i) When the first student did the experiment some acid sprayed out of the flask as the metal carbonate reacted. Explain the effect this mistake would have on the calculated relative atomic mass of the metal. ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... (3) (ii) The second student used 100 cm3 of dilute hydrochloric acid instead of 50 cm3. Explain the effect, if any, this mistake would have on the calculated relative atomic mass of the metal. ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... (3) (Total 17 marks) Q4.(a) Figure 1 shows an atom of element G. Page 11 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Figure 1 Draw a ring around the correct answer to complete each sentence. (i) Label A shows an electron an ion a nucleus (1) (ii) The particle labelled B is an isotope a molecule a neutron (1) (iii) The mass number of element G is 5 6 11 (1) (iv) Use the periodic table to identify element G. Element G is boron carbon sodium (1) (b) Figure 2 shows a compound of G and hydrogen. Figure 2 Page 12 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Draw a ring around the correct answer to complete each sentence. (i) The formula of the compound in Figure 2 is GH3 G3H 3HG (1) (ii) The type of bonding shown in Figure 2 is covalent ionic metallic (1) (Total 6 marks) Q5.(a) The symbols for seven different elements are shown in Figure 1. Figure 1 He Be Na S Ca Fe Choose the correct symbol from Figure 1 to answer each question. You may use each symbol once, more than once or not at all. Write the symbol that represents: Page 13 Ar Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (i) a Group 1 element ............................................................ (1) (ii) a transition metal ............................................................ (1) (iii) an element with electrons in the same number of energy levels as an atom of argon (Ar) ............................................................ (1) (iv) an element which forms an oxide that dissolves in water to form an acidic solution ............................................................ (1) (v) an element that forms a chloride with the formula XCl ............................................................ (1) (b) A teacher put a cube of sodium metal into water containing universal indicator, as shown in Figure 2. Figure 2 The equation for the reaction is: Page 14 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (i) 2Na(s) + 2H2O(l) 2NaOH (aq) + H2(g) sodium + water sodium hydroxide + hydrogen The sodium floated on the surface of the water. The universal indicator turned purple. Give three other observations that would be seen during the reaction. 1 ............................................................................................................ ............................................................................................................... 2 ............................................................................................................ ............................................................................................................... 3 ............................................................................................................ ............................................................................................................... (3) (ii) Name the ion that made the universal indicator turn purple. ............................................................................................................... (1) (c) Figure 3 represents the electronic structure of a sodium atom. Figure 3 In the space below, draw the electronic structure of a sodium ion. Include the charge on the ion. Page 15 Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (2) (Total 11 marks) Page 16