SSS 5105, 5107 Prelim 2021 P3_final

5105, 5107/03/PRELIM/21 [Turn over SINGAPORE SPORTS SCHOOL PRELIMINARY EXAMINATION SECONDARY 4 NORMAL ACADEMIC ______________________________________________________________________ SCIENCE (CHEMISTRY) 5105/03, 5107/03 Paper 3 Multiple Choice 16 AUGUST 2021 Papers 3 and 4: 1 h 15 min Additional materials: Multiple Choice Answer Sheet _____________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your class, index number and name on the Answer Sheet in the spaces provided. There are twenty questions on 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. Answers to Paper 3 and Paper 4 must be handed in separately. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You are advised to spend no more than 30 minutes on Paper 3. You may proceed to answer Paper 4 as soon as you have completed Paper 3. Any rough working should be done in this booklet. A copy of the Periodic Table is printed on page 10. The use of an approved scientific calculator is expected, where appropriate. This document consists of 9 printed pages and 1 blank page. CANDIDATE NAME CLASS INDEX NUMBER Mark: 20

2 5105, 5107/03/Prelim/21 [Turn over 1 1.50g of zinc powder is added to 50.0cm3 of hydrochloric acid. Which apparatus is used to measure the zinc and hydrochloric acid? zinc hydrochloric acid A electronic balance beaker B electronic balance burette C weighing scale beaker D weighing scale burette 2 The melting points and boiling points of pure substances W, X and Y are given in the table below. substance W X Y melting point / °C –114 44 –101 boiling point / °C 78 280 –34 The substances are chlorine, ethanol and phosphorus. Which row identifies W, X and Y? W X Y A chlorine phosphorus ethanol B ethanol chlorine phosphorus C ethanol phosphorus chlorine D phosphorus chlorine ethanol 3 Which method can be used to separate a mixture of water and ethanol? A chromatography B evaporation C filtration D fractional distillation

3 5105, 5107/03/Prelim/21 [Turn over 4 Which statement about an atom of oxygen-18, O8 18 , is correct? A It has more neutrons than protons. B It has more protons than electrons. C It has the same number of neutrons and electrons. D It has a total of 28 protons, neutrons and electrons. 5 A powdered solid G is grey with white specks. Water is added to it and this is stirred and filtered. Colourless liquid H and grey solid J are collected. J is attracted to a magnet. Which of the following describes G, H and J correctly? G H J A compound element mixtur