2022 PgSS Chem Prelims P1

EXP PUNGGOL SECONDARY SCHOOL SECONDARY 4 EXPRESS PRELIMINARY EXAMINATION QUESTION & ANSWER BOOKLET NAME CLASS INDEX NUMBER Chemistry Paper 1 6092 30 August 2022 Additional materials: MCQ answer Sheet 1 hour READ THESE INSTRUCTIONS FIRST Write your class, register number and name on all the work you hand in. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. There are forty 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. Read the instructions on the Answer Sheet very carefully. 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 18. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s use Parent’s Signature Section A /40 - - - - Total /40 This paper consists of 18 printed pages and 0 blank page. ���

2 1 A student is preparing a gas in the laboratory that is soluble in water and less dense than air. What is the most suitable method for collecting the gas? A B C D 2 The diagram shows a beaker full of gas X inverted over a porous pot containing gas Y. A known liquid is used in the container. None of the gases provided below is soluble in the liquid. Which pair of gases will lead to the liquid spilling out at the outlet O? Gas X Gas Y A chlorine hydrogen B argon neon C flourine helium D neon flourine ���

3 3 The diagram below shows the cooling curve for an unknown substance. The substance changes from liquid to solid. 1 The particles in the substance below temperature T1 vibrate about their fixed position. 2 The substance could be a sample of crude oil. 3 The freezing point is the average of T1 and T2. Which statement(s) is/are correct? A 1, 2 and 3 B 1 and 2 only C 1 only D 2 only 4 A salt, R, on warming with excess aqueous sodium hydroxide, evolved a gas that turned damp red litmus paper blue. When no more gas was evolved, a piece of aluminium foil was added, and a further evolution of the same gas occurred. What could be R? A ammonium nitrate B ammonium sulfate C zinc nitrate D zinc sulfate ���

4 5 An ion Y2+ contains 19 neutrons and 18 electrons. Which of the following shows the proton number and nucleon number of Y? proton number nucleon number A 16 35 B 18 37 C 19 38 D 20 39 6 The electronic configuration of X is 2,8,4. X reacts with an element Y from Group VII to form a compound. Which of the following best describes the compound formed? type of bonding formula of compound A ionic XY4 B ionic X4Y C covalent XY4