TMJC_2023_H2 Chem_P4_Answer

Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Chemistry CANDIDATE NAME ANSWERS CIVICS GROUP H2 CHEMISTRY 9729/04 Practical 29 August 2023 2 hours 30 minutes Candidates answer on the Question Paper. This document consists of 21 printed pages. READ THESE INSTRUCTIONS FIRST Write your name and Civics Group in the spaces at the top of the page. Give details of the practical shift and laboratory where appropriate, in the boxes provided. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the question paper. The use of an approved calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Qualitative Analysis Notes are printed on pages 20 and 21. The number of marks is given in brackets [ ] at the end of each question or part question. Shift Laboratory For Examiner’s Use 1 / 11 2 / 16 3 / 17 4 / 11 Total / 55 TAMPINES MERIDIAN JUNIOR COLLEGE PRELIMINARY EXAMINATION

2 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Chemistry Answer all the questions in the spaces provided. 1 Investigation of organic and inorganic compounds (a) FA 1 , FA 2 , FA 3 and FA 4 are aqueous solutions known to be hydrochloric acid, ethanoic acid, methanoic acid and sulfuric acid. All the solutions have the same concentration. Note: the order of FA 1 to FA 4 does not correspond to the order of identities given above. (i) Carry out the following tests for FA 1 to FA 3. Record your observations in Table 1.1. Observations for FA 4 have already been recorded in Table 1.1. There is no need to carry out the tests for FA 4. The volumes given below are approximate and should be estimated rather than measured. Test and identify any gases evolved. If there is no observable change, write no observable change.

[Turn over 3 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Chemistry Table 1.1 test observations FA 1 (H2SO4) FA 2 (HCl) FA 3 (HCOOH) FA 4 (ethanoic acid) 1. Add about 2 cm depth of FA 1 in a test-tube. Add a piece of magnesium into FA 1. Repeat using FA 2 and FA 3, in place of FA 1. There is vigorous/faster effervescence observed. Gas evolved “pops” with a lighted splint. Gas is hydrogen. There is vigorous/faster effervescence observed. Gas evolved “pops” with a lighted splint. Gas is hydrogen. There is slower effervescence observed. Gas evolved “pops” with a lighted splint. Gas is hydrogen. There is slower effervescence observe