2022 Sec 4 NA Science Chemistry

2022 SECONDARY 4 Normal Academic Exam Paper NA Science Chemistry 1 Admiralty Sec SA2 2 Assumption English SA2 3 Bedok South Sec SA2 4 Chua Chu Kang Sec SA2 5 Fuchun Sec SA2 6 Pasir Ris Sec SA2 7 Peirce Sec SA2 8 Woodgrove Sec SA2 www.KiasuExamPaper.com 1

www.KiasuExamPaper.com 2

This question paper consists of 8 printed pages including this cover page. ADMIRALTY SECONDARY SCHOOL SUBJECT : Science (Chemistry) CODE/PAPER : 5105/3, 5107/3 LEVEL/STREAM : Secondary 4 Normal (Academic) DATE : 2 August 2022 TIME : 0800h – 0915h DURATION : 1 hour 15 minutes 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 Optical Answer Sheet provided unless this has been done for you. 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 Optical Answer Sheet. Fill in the Optical Answer Sheet very carefully. 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 question paper. A copy of the Periodic Table is printed on page 8. The use of an approved scientific calculator is expected, where appropriate. DO NOT TURN OVER THIS PAPER UNTIL YOU ARE TOLD TO DO SO. PRELIMINARY EXAMINATION 2022 NAME: NO: CLASS: 20 www.KiasuExamPaper.com 3

2 1 Which of the following pieces of apparatus is most suitable for accurately measuring out 16.80 cm3 of water? 2 The graph below shows the heating curve of solid N. What does the graph suggest about solid N? A It is not pure. B It is a liquid at 0 qC. C It is an ionic compound. D It has a high melting point. A B C D temperature / qC time / min 0 www.KiasuExamPaper.com 4

3 3 The diagram below shows a common experimental set-up used to se parate mixtures in the laboratories. Which of the following mixtures can be separated into its compo nents using the set-up above? A argon and carbon dioxide B carbon and iron C petrol and kerosene D sand and water 4 The diagram below shows an experiment to obtain water from aqueous copper sulfate. Aqueous copper sulfate is a blue solution. After 1 0 minutes of heating, what are the colours of the liquids in the flask and the beaker? flask beaker A blue blue B blue colourless C colourless blue D colourless colourless water out water in beaker heat flask aqueous copper sulfate www.KiasuExamPaper.com 5

4 5 The table below shows information about four different compounds. Which of the following correctly shows the elements present in each compo