Jurongville 2024 Prelim 4E Chemistry Paper 2

JVSS Prelim 2024 4E Chemistry 6092/02 [Turn over JURONGVILLE SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 Secondary 4 Express STUDENT NAME CLASS INDEX NUMBER CHEMISTRY 6092/02 Paper 2 02 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number in the spaces 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 one question. Write your answers 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 the Periodic Table is printed on page 20. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Section A / 70 Section B / 10 Total / 80 Setter: Ms Ethel Chng This document consists of 20 printed pages.

2 JVSS Prelim 2024 4E Chemistry 6092/02 Section A Answer all questions. 1 (a) Choose from the substances listed to answer the questions. aluminium oxide calcium oxide carbon dioxide iron(II) oxide nitrogen monoxide potassium oxide sulfur dioxide Each substance may be used once, more than once or not at all. Identify the substance which (i) dissolves in water to raise the pH of soils, .……………………………………………………………………………………… [1] (ii) is a neutral oxide, .……………………………………………………………………………………… [1] (iii) reacts with both acids and alkalis, .……………………………………………………………………………………… [1] (iv) turns acidified potassium manganate(VII) from purple to colourless, .……………………………………………………………………………………… [1] (v) warms with excess hydrochloric acid to form a green solution. .……………………………………………………………………………………… [1] (b) The following are statements about alkali metals in the Periodic Table. Put a tick ( ✓) in one box in each row to show which statements are true and which are false. true false They all float on water. They lose electrons more easily down the group. They rapidly tarnish in air. They react with water to form two alkaline products. [2] [Total: 7]

3 JVSS Prelim 2024 4E Chemistry 6092/02 [Turn over 2 Magnesium, with the symbol Mg and an atomic number of 12, has a relative atomic mass of approximately 24.3. (a) Define relative atomic mass of an element. …………………………………………………………………………………………………… ……………………………………………………………………………………..………… [1] (b) The relative atomic mass of 24.3 is a weighted average of the masses of its three naturally occurring isotopes, Mg-24, Mg-25, and Mg-26. Given that the relative abundance of Mg-25 is 10%, calculate the relative abundanc