ACSI 2019 Y6 Prelim Paper 1_QP

1 Anglo-Chinese School (Independent) YEAR 6 PRELIMINARY EXAMINATION 2019 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 1 Wednesday 18th September 2019 1 hour 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. This question paper consists of 16 printed pages, including the cover page.

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4 1. Which coefficients would balance this equation? _HCl + _MnO2 → _MnCl2 + _Cl2 + _H2O HCl MnO2 MnCl2 Cl2 H2O A. 4 1 1 2 2 B. 4 1 1 1 2 C. 3 1 1 1 1 D. 2 1 1 1 1 2. 150 cm3 of water is added to a solution of 100 cm 3 of 0.50 mol dm −3 potassium nitrate. What is the concentration of potassium nitrate, in mol dm−3, in the new solution? A. 0.05 B. 0.10 C. 0.15 D. 0.20 3. Which statement correctly describes the atomic emission spectrum of hydrogen? A. It is a continuous spectrum converging at low frequency. B. It is a continuous spectrum converging at high frequency. C. It is a line spectrum converging at low frequency. D. It is a line spectrum converging at high frequency. 4. What is the condensed electron configuration of the telluride ion, Te2−? A. [Kr]5s25d105p6 B. [Kr]5s24d105p2 C. [Kr]5s24d105p6 D. [Kr]5s24d105p4

5 5. Which statement explains one of the decreases in first ionization energy (I.E.) across period 3? A. The nuclear charge of element Al is greater than element Mg. B. A new sub-level is being filled at element S. C. The p orbital being filled in element Al is at a lower energy than the s orbital in element Mg. D. There is electron-electron repulsion for the paired electrons in element S. 6. Which definition of electronegativity is correct? A. The attraction of an atom for a bonded pair of electrons in a covalent bond. B. The attraction between the nucleus and the outermost electron of an atom. C. The energy required for an atom in the gaseous state to gain one electron. D. The energy required for an atom to form a negative ion with a noble gas electron configuration. 7. Which is correct when the ionic or atomic radii are compared? A. Mg2+ > Al B. S2− > Cl− C. K < K+ D. B < C