Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. A B C D [1] 2. Successive ionisation energies of four elements in Period 3 are shown below. Which letter could represent magnesium? A B C D [1] 3. As per the aufbau principle, which of the following orbitals have the greatest energy? A) B) C) D) 3p 4s 3s 3d A B C D [1] 4. In this question you should assume methane behaves as an ideal gas. The gas laws can be summarised in the ideal gas equation below. pV = nRT The volume of a sample of methane is measured at a temperature of 60 °C and a pressure of 103 kPa. The volume measured is 5.37 × 10–3 m3. What is the mass of the sample of methane, given to two significant figures? A) 0.0032 g B) 0.018 g C) 3.2 g D) 18 g A B C D [1] 5. Which of the following molecule would have one unshared pair of electrons on the central atom. A) B) C) D) CH4 NH3 CO2 H2S A B C D [1] 6. From the statement below identify which one is incorrect A) Electronegativity is ability of an atom in molecule to attract electron density toward itself. B) Electronegativity is the tendency to attract shared electrons when formed chemical bonds. C) Electronegativity is the same thing as electron affinity. D) The numerical values for electronegativity have no units. A B C D [1] 7. Which diagram correctly shows the bonding in ammonium ion NH4+? A B C D [1] 8. The number of electrons involved in the bond formation of oxygen molecule A) B) C) D) 2 4 6 10 A B C D [1] 9. The Newlands relation is referred to as A) the Musical Law B) the Law of Octaves C) the Periodic Law D) the Atomic Mass Law A B C D [1] 10. Which atom has the following electron configuration: 1s22s22p63s23p64s23d104p65s24d2? A) B) C) D) Zr Nb Y W A B C D [1] Section B For each of the questions in this section, one or more of the three numbered statements 1 to 3 may be correct. Decide whether each of the statements is or is not correct (you may find it helpful to put a tick against the statements that you consider to be correct). The responses A to D should be selected on the basis of A B C D 1, 2 and 3 are correct. 1 and 2 only are correct. 2 and 3 only are correct. 1 only is correct. No other combination of statements is used as a correct response. 11. Which statements about the phosphide ion, 31P3- , and the chloride ion, 35Cl-, are correct? 1 They have the same number of electrons. 2 They have the same number of neutrons. 3 They have the same number of protons. A B C D [1] 12. Which statement/s about an atom of iron-56 ( 56 26饾惞饾憭 ) is/are correct? 1. It contains 30 neutrons 2. Its nucleus has a relative charge of 26+ 3. It has 4 fewer protons than neutrons A B C D [1] 13. Which pairs of compounds does not have hydrogen bonding between its molecules? 1. fluoromethane CH3F and hydrogen chloride HCl 2. hydrogen fluoride HF and hydrogen peroxide H2O2 3. methanol CH3OH and water H2O A B C D [1] 14. Give the reason why is water classified as a polar molecule? 1. in water molecule O-H bonds are non-polar 2. the oxygen more electronegative, than hydrogen 3. water molecule has bent (V) shape A B C D [1] 15. Within the s-block elements, the elements at the top of the table, compared with those at the bottom 1. have smaller size 2. have lower ionization energies 3. have same number of isotopes. A B C D [1] Section C 16. A mass spectrometer can be used to find relative atomic mass, Ar, and relative molecular mass, Mr. The diagram shows one type of mass spectrometer (i) (ii) On the diagram label the magnet. What process occurs in this part of the spectrometer? [1] ………………………………………………………………………………………………. [1] (iii) Explain what is happening in the mass spectrometer in the region labelled A …………………………………………………………………………………………….. ………………………………………………………………………………………………. [2] [Total 4 marks] 17. Metal A can be identified from its relative atomic mass. Analysis of a fifty pence coin showed that two isotopes of metal A were present with the following percentage abundances. Isotope Isotope 1 Isotope 2 Relative isotopic mass 63.0 65.0 % abundance 77.2 22.8 (i) What analytical method is used to obtain this information? ......................................................................................................................... [1] (ii) Define the term relative atomic mass. ........................................................................................................................................................... ........................................................................................................................................................... ............................................................................................................................................. (iii) [2] Calculate the relative atomic mass of the sample of metal A. Give your answer to three significant figures. answer ........................... [1] (iv) Use your answer to (iii) and the Data Sheet to suggest the identify of metal A. ......................................................................................................................... [1] [Total 5 marks] 18. (a) An unknown metal carbonate reacts with hydrochloric acid according to the following equation M2CO3(aq) + 2HCl(aq) → 2MCl(aq) + CO2(g) + H2O(l) A 3.44 g sample of M2CO3 was dissolved in distilled water to make 250 cm3 of solution. A 25.0 cm3 portion of this solution required 33.2 cm3 of 0.150 mol dm–3 hydrochloric acid for complete reaction. (i) Calculate the amount, in moles, of HCl in 33.2 cm3 of 0.150 mol dm–3 hydrochloric acid. Give your answer to 3 significant figures. ............................................................................................................. ............................................................................................................. [1] (ii) Calculate the amount, in moles, of M2CO3 that reacted with this amount of HCl. Give your answer to 3 significant figures. ............................................................................................................. ............................................................................................................. [1] (iii) Calculate the amount, in moles, of M2CO3 in the 3.44 g sample. Give your answer to 3 significant figures. ............................................................................................................. ............................................................................................................. [1] (iv) Calculate the relative formula mass, Mr, of M2CO3 Give your answer to 1 decimal place. ............................................................................................................. ............................................................................................................ [1] (v) Hence determine the relative atomic mass, Ar, of the metal M and deduce its identity. Ar of M ................................................................................................. Identity of M ........................................................................................ [2] [Total 6 marks] 19. 0.52 g of sodium was added to 100 cm3 of water. Calculate: a) The volume of hydrogen evolved at 298 K and 100 kPa [2] b) A compound of sodium and oxygen contains 58.97% sodium. (i) Calculate the empirical formula of this compound, using the data above and the periodic table. [1] (ii) 0.25 moles of this compound have mass 19.5g. Use this information to help you deduce the molecular formula of this compound. [2] [Total 5 marks] 20. Sodium sulphide, Na2S, is a high melting point solid which conducts electricity when molten. Carbon disulphide, CS2, is a liquid which does not conduct electricity. (i) Deduce the type of bonding present in Na2S and that present in CS2 Bonding in Na2S .................................................................................. Bonding in CS2..................................................................................... [1] [1] (ii) By reference to all the atoms involved explain, in terms of electrons, how Na2S is formed from its atoms. ............................................................................................................................................. .............................................................................................................................................. [2] (iii) Draw a diagram, including all the outer electrons, to represent the bonding present in CS2 [2] (iv) State one property of carbon disulphide that depend on its structure. ............................................................................................................................................. [1] [Total 7 marks] 21. The table below shows two physical properties of the element strontium. Explain these physical properties of strontium, in terms of bonding and structure. Include a labelled diagram in your answer. Diagram [2] Explanation ............................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [2] [Total 4 marks] 22. Predict which one of the following has the highest boiling temperature. Compound A: CH3COOCH2CH3 Compound B: CH3CH2CH2CH2OH Compound C: CH3CH2CH2CH2CH3 Explain your choice in terms of types and strength of the intermolecular forces. Compound: ………………… [1] Explanation: ………………………………………………………………………………………. ……………………………………………………………………………………………………. ……………………………………………………………………………………………………. …………………………………………………………………………………………………….. [3] [Total 4 marks] 23. This question is about shapes of molecules a) Draw the shape of BCl3 and of 小小l2. Include any lone pairs of electrons that influence the shape. Name the shape of BCl3 and of 小小l2. Shape of 小小l2. Shape of BCl3 Name of shape of BCl3 ……………………………………………………………………………… Name of shape of 小小l2 ………………………………………………………………………………… [4] b) Predict the bond angle in CCl2 and explain why this angle is different from that in BCl3 Predicted bond angle ......................................................................... Explanation .................................................................................................................................... ....................................................................................................................................................... [2] [Total 6 marks] 24. (a) State and explain the trend in atomic radius of the Period 3 elements from sodium to chlorine. Trend ........................................................................................................... Explanation ........................................................................................................................... ............................................................................................................................................... [2] (b) State and explain the general trend in the values of the first ionisation energies of the elements Na to Ar. Trend ........................................................................................................... Explanation ........................................................................................................................... ....................................... ........................................................................................................ [2] [Total 4 marks] [Total 60 marks]
