Chem Y3 EOY RVHS P1 2023 with ans

River Valley High School Pg 1 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 RIVER VALLEY HIGH SCHOOL SEC 3 END-OF-YEAR EXAMINATION CHEMISTRY PAPER 1 9 OCTOBER 2023 45 MINUTES NAME CLASS 3 INDEX NO. READ THESE INSTRUCTIONS FIRST DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number in the spaces provided. There are thirty questions in this paper. 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 provided. 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 printed on page 12. The use of an approved scientific calculator is expected, where appropriate. _________________________________________________________________________ This document consists of 11 printed pages and 1 blank page.

River Valley High School Pg 2 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 1 Which piece of apparatus would be most suitable for measuring 25.5 cm3 of a liquid? A conical flask B volumetric flask C measuring cylinder D pipette 2 The Health Sciences Authority (HSA) tested a weight loss product which is suspected to contain harmful ingredients. The chromatogram of the weight loss product is obtained as shown below, along with a reference table of Rf values of some harmful ingredients. What are the harmful ingredients present in the weight loss product? A dexamethasone only B chlorpheniramine and dexamethasone only C frusemide and sibutramine only D chlorpheniramine, dexamethasone and sibutramine only 3 In an experiment, the melting point of an unknown solid was found to be 60 °C, the same as cyclohexene. To check its identity, the experiment was repeated by using equal parts of the solid and pure cyclohexene. The melting point of the mixture was found to be 50 – 53 °C. What can be deduced from the experimental results? A The unknown solid is a mixture. B The unknown solid is pure cyclohexene. C The unknown solid may contain cyclohexene. D The unknown solid is not cyclohexene.

River Valley High School Pg 3 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 4 Three separations are listed. 1 obtaining water from sodium chloride solution 2 obtaining iodine from a mixture of iodine and sodium chloride 3 obtaining solid sodium chloride from aqueous sodium chloride Which techniques would be involved in these separations? 1 2 3 A distillation sublimation evaporation B distillation sublimation filtration C filtration crystallisation evaporation D sublimation crystallisation filtration 5 Two gases, H2S (Mr = 34.1) and SO2 (Mr = 64.1) were separately released from one end of a laboratory on a cold day. The experiment was repeated on a hot day. The time taken for the gases to reach the opposite end of the laboratory was recorded for each experiment. Which gas on which day would take the longest to reach the end of the laboratory? gas day A H2S cold B H2S hot C SO2 cold D SO2 hot 6 Which statement correctly describes the particles of a liquid as it boils? A The particles lose heat energy. B The spaces between the particles increase. C The particles vibrate faster about their fixed positions. D A chemical change occurs as particles combine to form products.

River Valley High School Pg 4 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 7 The boiling points of three gases are given in the table below. gas argon nitrogen oxygen boiling point /oC −186 −196 −183 If a mixture of these gases at −180 oC is allowed to cool gradually to −190 oC, which of the following will happen? A Argon, nitrogen and oxygen will exist in the liquid state. B Argon and oxygen will remain in gaseous state. C Argon and nitrogen will remain in the gaseous state. D Nitrogen will remain in the gaseous state. 8 Which statement about the particles of ‘fluorine’ and ‘fluoride’ is correct? A They are chemically identical. B They are isotopes. C They have the same number of electrons. D They have the same number of protons. 9 The diagram shows the structure of an atom. Which diagram shows the structure of an isotope of this atom? A B C D + ─ n ─ n + Key = electron = neutron = proton + + ─ n + ─ n + ─ n + ─ n ─ +

River Valley High School Pg 5 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 10 In the lattice structure of ionic compounds, the coordination number of each ion is the number of neighbouring ions of opposite charge. The table below shows the ions present and the coordination number of ions in some ionic compounds. Taking sodium chloride for instance, each sodium ion is surrounded by 6 chloride ions, while each chloride ion is surrounded by 6 sodium ions. Hence, the coordination number for both the sodium ions and chloride ions is 6. ionic compound ions present coordination number of formula cation anion cation anion sodium chloride Na+ Cl− 6 6 NaCl titanium(IV) oxide Ti4+ O2− 6 3 TiO2 compound P Q R 4 8 ? Using information from the table, determine the formula of compound P. A QR2 B Q2R C QR4 D Q4R 11 Phosgene is a poisonous gas that was used as a chemical weapon during World War I. Its structure is shown below. Which statements about phosgene are correct? I. Phosgene has a boiling point below 100 oC. II. The total number of valence electrons that are involved in bonding in the phosgene molecule is 8. III. Each chlorine atom has 6 valence electrons which are not involved in bonding. A I and II B I and III C II and III D I, II and III

River Valley High School Pg 6 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 12 A covalent oxide compound has the chemical formula P2O. What could be the electronic configuration of atom P? A 2.4 B 2.8.1 C 2.8.6 D 2.8.7 13 The table below shows the physical properties of 3 substances. X Y Z melting point / °C 98 714 3652 electrical conductivity at room temperature conducts electricity does not conduct electricity conducts electricity What could be substances X, Y and Z? X Y Z A water silicon dioxide diamond B sodium chloride silicon dioxide graphite C ethanoic acid magnesium chloride diamond D sodium magnesium chloride graphite 14 Which substance contains the greatest number of atoms in 1 g? A Ne B F2 C NO2 D SO2 15 Ammonium nitrate, NH 4NO3, can be manufactured from ammonia, NH 3, in a two -step process. Step 1: NH3 + 2O2 → HNO3 + H2O Step 2: HNO3 + NH3 → NH4NO3 What is the maximum mass of NH4NO3 that can be made from 17 tonnes of ammonia? [1 tonne = 1000 kg] A 34 tonnes B 40 tonnes C 80 tonnes D 97 tonnes

River Valley High School Pg 7 of 12 Sec 3 RVIP Chemistry End-of-Year Examination 2023 16 On heating, the carbonate of element Y decomposes. Y2CO3(s) → Y2O(s) + CO2(g) When 13.8 g of Y2CO3 was heated, 1.2 dm 3 of carbon dioxide gas, measured at room temperature and pressure, was released. What is the relative atomic mass, Ar of Y? A 216.0 B 108.0 C 276.0 D 123.0 17 12.2 g of impure magnesium was added to excess hydrochloric acid. 6.0 0 dm3 of H2 was evolved at room temperature and pressure. What is the percentage purity of the magnesium? A 24.9 % B 49.8 % C 74.7 % D 99.6 % 18 The formula of a nitride of element X is X3N2. 80.0 g of X3N2 contains 57.8 g of X. How many moles of X does 57.8 g of the element contain? A 22.2 14.0 × 3 2 B 22.2 14.0 × 2 3 C 80.0 14.0