SAJC Prelim P1

ST. ANDREW’S JUNIOR COLLEGE Higher 1 PRELIMINARY EXAMINATION 2009 CHEMISTRY PAPER 1 8872/ 01 17 September 2009 50 minutes Candidates answer all the questions on the Optical Answer Sheet Additional Materials: Optical Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name and civics group on the Answer Sheet. There are thirty questions in these sections. Answer all questions. For each question there are four possible answers A, B, C, and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. This paper consists of 12 printed pages and 1 blank page.

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3 Section A (25 marks) For each qu estion there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 Which of the following statements is not true? A One mole of water contains 2 moles of hydrogen atoms. B One mole of chlorine gas contains 6.02 × 1023 atoms of chlorine. C One mole of ammonia has a mass of 17.0 g. D One mole of sodium chloride contains 1.204 × 1024 ions. 2 In an experiment, 0.0013 mole of a metallic salt, reacted completely with 20.80 cm3 of 0.025 mol dm-3 MnO4 -. The half equation for the reduction of MnO4 - is shown below: MnO4 - + 8H+ + 5e → Mn2+ + 4H2O Given the final oxidation number of the metal in the salt was +5, what would the original oxidation number of the metal be? A +1 B +2 C +3 D +4 3 In which of the compound does sulfur show the lowest oxidation state? A H2S B SCl2 C SO3 2- D S2O3 2- [Turn Over

4 4 The use of t he Data Booklet is relevant to this question. Which of the following species has more electrons than protons and more protons than neutrons? [D = ] H2 1 A D- B OH- C OD- D He+ 5 The orbitals of a carbon atom may be represented as shown. 1s 2s 2p Which diagram represents the arrangement of electrons in the ground state of the atom? A B C D

5 6 The diagra m shows a liquid flowing from a burette and a charged rod is brought close to the flow. Which could not be a possible identity of the liquid? A CHCl3 B C2H6 C C2H5OH D C2H5Br 7 How many σ and π bonds are there in the molecule, CH3CH=CH2? σ π A 4 0 B 4 1 C 7 1 D 8 1 8 Which of the following compounds consists of atoms or molecules held together only by van der Waals’ forces? A Sodium B Silicon C Iodine D Water [Turn Over

6 9 The radius a nd charge of each of the five ions are shown in the table below. Ion M+ Q+ R 2+ T— W 2- radius / nm 0.13 0.19 0.16 0.13 0.16 The ionic solids MT, QT and RW are of the same lattice type. What is the correct order of their lattice energies placing the one wit