kss comb chem 2024 prelim p4

Candidate Name: __________________________ ( ) Class: _________ KRANJI SECONDARY SCHOOL Preliminary Examination Secondary 4 Normal (Academic) SCIENCE (CHEMISTRY) 5105/04 Paper 4 5107/04 Papers 3 and 4 Friday 2 August 2024 1 hour 15 minutes KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI READ THESE INSTRUCTIONS FIRST Write your name, index number and class 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, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. The use of an approved scientific calculator is expected, where appropriate. In calculations, you should show all the steps in your working, giving your answer at each stage. You are advised to spend no longer than 30 minutes on Paper 3. You may proceed to answer Paper 4 as soon as you have completed Paper 3. A copy of the Periodic Table is printed on page 11. At the end of the examination hand in your answers to Paper 3 and Paper 4 separately. The number of marks is given in brackets [ ] at the end of each question or part question. Set by: Mr Joel Lee This Question Paper consists of 11 printed pages and 1 blank page. [Turn over For Examiners’ Use Paper 3 20 Paper 4 30 Total 50 4NA Session 1

2 Section A Answer all the questions in the spaces provided. 1 Several substances are listed below. sulfur dioxide iodine zinc hydrochloric acid brass ammonium nitrate helium sodium hydroxide methane Answer the following questions using the substances from the list. Each substance may be used once, more than once, or not at all. (a) Which substance is a mixture of elements? ………………………………………………………………………………………………. [1] (b) Which substance is a monoatomic gas? ………………………………………………………………………………………………. [1] (c) Which substance is a major greenhouse gas that contributes to global warming? ………………………………………………………………………………………………. [1] (d) Which two substances react to form ammonia gas? ………………………………………………………………………………………………. [1] [Total: 4]

3 [Turn over 2 The table below shows the boiling point s of nitrogen, oxygen and argon, which