2022 Peirce Chemistry P3

1 [Turn over Class Register No. Candidate Name PEIRCE SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY 4 EXPRESS / 5 NORMAL ACADEMIC SCIENCE (CHEMISTRY) 5076/03, 5078/03 Paper 3 (Theory) 26 AUGUST 2022 1 hour 15 minutes Candidates answer on the Question Paper. Additional Materials: Periodic Table INSTRUCTIONS TO CANDIDATES Write your name, class and register number on all the work you hand in. Write in dark blue or black pen. You may use a HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions in the spaces provided. Section B Answer any 2 questions. Answer all questions in the spaces provided. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of Data Sheet is printed on page 17. The use of an approved scientific calculator is expected, where appropriate. For Examiners’ Use Section A Parent’s signature Section B Total This paper consists of 17 printed pages and 1 blank page. Setter: Miss Pang Yin Yin

2 [Turn over Section A Answer all questions in this section in the spaces provided. The total marks for this section is 45. 1 A teacher used food (coloured candy) to demonstrate a science concept taught during the topic on separation technique. He spotted the colour obtained from the sample candy onto the paper and 3 permitted food dyes (PD1, PD2, PD3) are used for comparison. He estimated the height of the solvent and placed the paper into a beaker of solvent and allowed separation to take place. Fig. 1.1 shows the results after separation is completed. Fig. 1.1 (a) State the separation technique demonstrated by the teacher. …………………………………………………………………………………………. [1] (b) Draw a line on Fig. 1.1 to indicate the “height of the solvent when the paper is placed in the beaker”. Label it as (b). [1] (c) Is the candy safe for consumption? Explain your answer. …………………………………………………………………………………………. …………………………………………………………………………………………. [1] (d) Suggest one other use of chromatography. …………………………………………………………………………………………. [1] [Total:4]

3 [Turn over 2 Fig. 2.1 shows some properties and reactions of aqueous ammonia and some other substances. Fig. 2.1 Suggest the identity of A, B, C and D. A ………………………………………………………………………………………. [1] B ………………………………………………………………………………………. [1] C ………………………………………………………………………………………. [1] D ………………………………………………………………………………………. [1] [Total:4] Colourless acid solution A White precipitate B Add aqueo