ACSI 2020 Y6 Prelim Paper 1_QP

Additional materials: Multiple choice answer sheet Soft clean eraser Soft pencil (type 2B recommended) INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Shade your Candidate number on the multiple choice answer sheet provided. There are forty questions in this paper. Answer all the 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 multiple choice answer sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. A copy of the periodic table is provided for reference on Page 2 of the examination paper. Calculators are not allowed to be used in this paper. Anglo-Chinese School (Independent) YEAR 6 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 1 Monday 14 September 2020 1 hour This question paper consists of 19 printed pages, including the cover page.

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3 1. Which compound has the greatest percentage by mass of nitrogen atoms? A. N2H4 B. NH3 C. N2O4 D. NaNO3 2. What is the sum of the coefficients when the equation is balanced? _____ C6H14 (g) + ____O2 (g) → ____CO (g) + ____H2O (l) A. 30 B. 39 C. 41 D. 54 3. What is the total number of electrons in all the s orbitals found in Cu+? A. 0 B. 1 C. 5 D. 6

4 4. Which electron transition absorbs radiation with the shortest wavelength? 5. The first seven successive ionisation energies (in kJ mol −1) of an atom of element J are given below: 1020 1950 2730 4580 6020 12300 15400 Which of the following statements about element J is correct? A. It has a valence shell electronic configuration of ns2 np4. B. Its atomic radius is larger than its ionic radius. C. It forms a covalent chloride that has a trigonal pyramidal shape. D. It forms an ionic compound with sodium in a 1:1 mole ratio. 6. Which compound has the shortest C to O bond? A. CH3CHO B. CH3COOH C. CO2 D. CO

5 7. Which species has a molecular geometry that is different from the CO32− ion? A. BF3 B. PF3 C. SO3 D. NO3 − 8. Which pair of molecules can form intermolecular hydrogen bonding with each other? A. CH4 and HF B. CH3OCH3 and CF4 C. CH3OH and H2O D. CH4 and H2O 9. Which of the following information about the specified central atom is correct? Atom Number of electron domains about one central atom Molecular geometry Hybridisation A. C in C2F2 2 linear sp B. C in C2H6 4 square planar sp3 C. N in NH3 3 trigonal pyramidal sp3 D. O in H2O 4 bent sp2

6 10. Which species have resonance structures? I. azide ion, N3 − II. carbon dioxide, CO2 III. benzene, C6H6 A. I and II