ACSI 2021 Y6 Prelim Paper 1_QP

1 Anglo-Chinese School (Independent) YEAR 6 PRELIMINARY EXAMINATION 2021 INTERNATIONAL BACCALAUREATE DIPLOMA PROGRAMME CHEMISTRY HIGHER LEVEL PAPER 1 Monday 13th September 2021 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 17 printed pages, including the cover page.

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3 1. 0.10 mol of sulfuric acid is mixed with 0.10 mol of sodium metal. H2SO4 (aq) + 2Na (s) → Na2SO4 (aq) + H2 (g) Which is correct? Limiting Reagent Maximum yield of H2 /mol A. H2SO4 0.05 B. H2SO4 0.10 C. Na 0.05 D. Na 0.10 2. A 100 cm3 of gas has a pressure of 400 kPa. What would be the new pressure of the gas when the volume of the gas is compressed to half its original volume at constant temperature? A. 100 kPa B. 200 kPa C. 400 kPa D. 800 kPa 3. Which is correct for Se34 79 2– ? protons neutrons electrons A. 34 45 34 B. 34 45 36 C. 36 43 32 D. 79 34 36 4. What is the total number of sub-levels that are occupied in a Cr+ ion? A. 3 B. 4 C. 6 D. 7

4 5. Which statements are correct for the emission spectrum of hydrogen? I. The lines converge at higher frequencies. II. Electron transitions to n = 1 correspond to the ultraviolet region. III. Lines are produced when electrons move from higher to lower energy levels. A. I and II only B. I and III only C. II and III only D. I, II and III 6. Consecutive elements X, Y and Z are in Period 3 of the Periodic Table. Element Y has the highest first ionisation energy and the lowest melting point of these three elements. What are the identities of X, Y and Z? A. Sodium, magnesium, aluminium B. Magnesium, aluminium, silicon C. Aluminium, silicon, phosphorus D. Silicon, phosphorus, sulfur 7. Sulfur is converted to SF6 by fluorine, to SCl2 by chlorine and to S2Br2 by bromine. Which best explains this observation? A. Bond energy of F2 < Cl2 > Br2 B. Oxidising ability of F2 > Cl2 > Br2 C. Electronegativity of F > Cl > Br D. First ionisation energy of F > Cl > Br

5 8. Which complex is colourless in solution? A. [Fe(H2O)6]Cl2 B. [Ni(NH3)6]Cl2 C. [Zn(H2O)6