ACSI 2018 Prelim Paper 1

Anglo-Chinese School (Independent) Year 6 Preliminary Examination 2018 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 1 Tuesday 11th September 2018 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. Write your Candidate number and the subject on the separate 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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3 1. Group 2 ionic hydrides react with water as follows: CaH2 + 2H2O → Ca(OH) 2 + 2H2 In an experiment, a certain mass of calcium hydride was dissolved in excess water. The resulting solution required 20.0 cm 3 of a 2.00 mol dm −3 HCl solution for complete neutralization. What was the mass of calcium hydride? A. 0.421 g B. 0.571 g C. 0.741 g D. 0.842 g 2 How many molecules are present in 1 cm 3 of oxygen gas under room conditions? (1 mol of gas occupies 24000 cm3) A. 1 × 24000 6.02 × 1023 B. 1 × 6.02 × 1023 24000 C. 6.02 × 1023 × 24000 1 × 1000 D. 1 × 6.02 × 1023 ×16 3. What do the ions 34P3− and 34S2− have in common? A. Both ions contain the same number of neutrons in their nuclei. B. Both ions have more neutrons than electrons. C. Both ions have an electronic configuration of [Ne] 3s2 3p6. D. Both ions have 16 protons in their nuclei. 4. Which electron transition in the hydrogen atom emission spectrum emits radiation with the shortest wavelength? A. n = 2 → n = 1 B. n = 3 → n = 2 C. n = 3 → n = 1 D. n = 4 → n = 3

4 5. The successive ionization energies of two elements, Q and R, are given. Ionization energies / kJ mol−1 1st 2nd 3rd 4th 5th 6th 7th 8th Q 740 1450 7720 10540 13630 18020 21700 25660 R 1011 1907 2910 4960 6270 21270 25431 29872 What is the formula of the compound formed when Q reacts with R? A. Q3R2 B. Q2R3 C. Q3R4 D. Q2R5 6. Which compound will be diamagnetic? A. [Cr(H2O)6)]Cl3 B. [Fe(H2O)6)]Cl2 C. [Zn(H2O)6)]Cl2 D. [MnCl4]2− 7. Which compound is not a product of the reaction between an oxide of a period 3 element and water? A. NaOH B. Al(OH)3 C. H3PO4 D. H2SO3 8. Which element in period 3 is not correctly des