Copy of SKSS Chem Prelim Paper 2

[Turn over Name and Index Number: ( ) Class: SENG KANG SECONDARY SCHOOL 2024 PRELIMINARY EXAMINATION CHEMISTRY 6092/02 Secondary 4 Express 21 August 2024 Paper 2 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your index number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer any one question. Write your answers in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 22. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s use Section A / 70 1 / 6 2 / 12 3 / 9 4 / 12 5 / 11 6 / 8 7 / 12 Section B / 10 8 / 10 9 / 10 Total / 80 Total % / 100 Parent’s / Guardian’s Signature: ………………….…………... This document consists of 22 printed pages. Do not turn over the page until you are told to do so.

2 [Turn over Section A [70 marks] Answer all the questions in this section in the spaces provided. 1 Choose from the list of compounds to answer these questions. aluminium nitrate ammonia calcium hydroxide carbon dioxide ethanol methane sulfur dioxide sulfuric acid water Each compound may be used once, more than once or not at all. Identify the compound that: (a) is a common solvent for chromatography in the laboratory, …………………………………………………………………………………………… [1] (b) is used to test for the presence of carbon dioxide, …………………………………………………………………………………………… [1] (c) decolourises acidified aqueous potassium manganate(VII), …………………………………………………………………………………………… [1] (d) gives white precipitate which dissolves in excess aqueous sodium hydroxide, …………………………………………………………………………………………… [1] (e) is a product of Haber Process, …………………………………………………………………………………………… [1] (f) is a waste gas from digestion in animals. …………………………………………………………………………………………… [1] [Total: 6]

3 [Turn over 2 This question is about metals and some metal compounds. (a) Chromium is a transition metal. Sodium is an element in Group 1 of the Periodic Table. State two physical properties of chromium that are different to those of sodium. 1. ………………………………………………………………………………………… 2. ………………………………………………………………………………………… [2] (b) The symbols for two isotopes of chromium are shown. Cr24 52 Cr24 53 Complete Table 2.1 to show