2022 Punggol Sec Chemistry P1

1 EXP PUNGGOL SECONDARY SCHOOL SECONDARY 4/5 EXPRESS 2022 PRELIMINARY EXAMINATION QUESTION BOOKLET NAME CLASS INDEX NUMBER Science (Physics/Chemistry) Paper 1 5076/01 30 August 2022 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and register number on the OTAS in the spaces provided. There are forty questions in this section. 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 OTAS. Read the instructions on the OTAS 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 of the Periodic Table is printed on page 17. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s use Parent’s Signature Physics - Chemistry - Total /40 This paper consists of 17 printed pages and 0 blank page.

2 Answer all questions. 21 What additional apparatus are needed to measure the rate of carbon dioxide produced when calcium carbonate is added to dilute hydrochloric acid in the set-up as shown? 1. stopwatch 2. measuring cylinder 3. gas syringe 4. gas jar A 1 and 2 B 2 and 4 C 1 and 3 D 2 and 3 22 A colourless solution of W is tested separately with aqueous sodium hydroxide and aqueous barium nitrate acidified with dilute nitric acid. The test results are shown. test aqueous sodium hydroxide aqueous barium nitrate acidified with dilute nitric acid results white ppt soluble in excess white precipitate Identify the colourless solution of W. A zinc chloride B zinc sulfate C calcium nitrate D calcium sulfate 23 Which diagram shows the arrangement of particles of a mixture of nitrogen and oxygen? dilute hydrochloric acid calcium carbonate

3 24 Water is a covalently bonded compound made from the elements oxygen and hydrogen. Which ‘dot and cross’ diagram shows the arrangement of the outer shell electrons in a molecule of water? A B C D 25 Which pair of elements form a compound by sharing of electrons? A carbon and hydrogen B potassium and chlorine C helium and nitrogen D sodium and iodine 26 Why does molten calcium chloride conduct electricity? A Electron is transferred from calcium to chlorine atoms. B The calcium and chloride ions are free to move. C The calcium and chloride electrons are free to move. D The calcium and chloride ions are attracted to each other strongly. 27 The electronic configuration of some elements are shown in the table. element Q