2023 SOTA Yr 6 Chem HL Prelim Exam P1

Yr6/4/CHEM/HP1/Aug2023 17 pages © School of the Arts, Singapore CHEMISTRY Higher Level Paper 1 Preliminary Examinations Tuesday 29 August 2023 1 hour INSTRUCTIONS TO CANDIDATES • Write your name, class and index number in the blanks below. • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question, choose the answer you consider to be the best and indicate your choice on the answer sheet provided. • The periodic table is provided for reference on page 2 of this examination paper. • The maximum mark for this examination paper is [40 marks]. Name: Class: Index: 40

- 2 - Yr6/4/CHEM/HP1/Aug2023 The periodic table

- 3 - Yr6/4/CHEM/HP1/Aug2023 Turn Over 1. What is the sum of coefficients when the following equation is balanced using the smallest whole number? ….Fe2+ + ….Cr2O72− + ….H+ → ….Fe3+ + ….Cr3+ + ….H2O A. 26 B. 28 C. 31 D. 36 2. What is the final concentration, in mol dm-3, of hydrochloric acid when 200 cm3 of 0.100 mol dm-3 hydrochloric acid is mixed with 300 cm3 0.200 mol dm-3 hydrochloric acid? A. 0.140 B. 0.150 C. 0.160 D. 0.190 3. 2.00 g of an alcohol, when vaporized, has a volume of 426 cm3 at 400 K and 100 kPa. Which equation shows its molar mass in g mol-1? A. 2.00 × 8.31 × 400100 × 426 B. 2.00 × 8.31 × 400 × 106 100 × 426 C. 2.00 × 8.31 × 400 106 × 426 × 100 D. 2.00 × 8.31 × 400 × 106100 × 103 × 426

- 4 - Yr6/4/CHEM/HP1/Aug2023 4. Which of these statements cannot be deduced from the periodic table on page 2? A. Each chromium atom has 28 neutrons. B. There are a few isotopes of neon in nature. C. There are 15 lanthanoids and 15 actinoids. D. The oxides of chlorine are acidic. 5. The first six ionization energies, in kJ mol-1, of an element are given below. IE1 IE2 IE3 IE4 IE5 IE6 578 1816 2744 11 576 14 829 18 375 Which group in the periodic table is this element found? A. Group 2 B. Group 13 C. Group 15 D. Group 16 6. The graph shows a set of data for the elements in period 3. What is the label on the vertical axis of this graph? A. First ionization energy B. Electrical conductivity C. Electronegativity D. Melting point Na Mg Al Si P S Cl Ar

- 5 - Yr6/4/CHEM/HP1/Aug2023 Turn Over 7. Which oxide does not dissolve in water but reacts with an alkali? A. MgO B. SiO2 C. P4O10 D. SO3 8. What is the overall charge, x, of this iron(III) complex? [Fe(H2O)4(OH)2]x A. 3+ B. 1+ C. 1- D. 2- 9. Which combination leads to a strong metallic bond? Charge on the metal ion Radius of ion A. high large B. high small C. low small D. low large 10. Which series shows molecules in order of increasing bond angles? A. NH3 < CH4 < CO2 B. NH3 < CH4 < H2O C. CH4 < BF3 < NH3 D. H2O < CO2 < BF3

- 6 - Yr6/4/C