Yishun Town 2025 Prelim Chemistry Paper 2 (with Answer)

NAME: ( ) CLASS: YISHUN TOWN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2025 SECONDARY 4 G3 CHEMISTRY (6092/2) DATE : 21 August 2025 DAY : Thursday DURATION : 1 h 45 min MARKS : 80 marks READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces provided at the top of this page. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question. You may use an approved calculator. A copy of the Periodic Table is printed on the last page. Section A Section B TOTAL This question paper consists of 18 printed pages, including the cover page.

2 SECTION A Answer all questions. 1 Some nuclide notations are given below. 1H 12C 14C 18O 56Fe 58Ni 65Zn Use the nuclide notations to answer the following questions. You may use them once, more than once or not at all. (a) Which is used as the basis for the definition of relative atomic and molecular masses? ……………………………………………………………………………………………………... [1] (b) Which is used in Haber Process? ……………………………………………………………………………………………………... [1] (c) Which is a metal but not a transition element? ……………………………………………………………………………………………………... [1] (d) Which two have the same number of neutrons? ……………………………………………………………………………………………………... [1] (e) Which two forms elements which are diatomic molecules? ……………………………………………………………………………………………………... [1] (f) Which two have the same chemical properties but different physical properties? ……………………………………………………………………………………………………... [1] [Total: 6]

3 2 Group 1 metals react with water. Group 1 metal reaction with water melting point / oC lithium sodium bubbles form rapidly with no flame potassium bubbles form very rapidly with flame rubidium explodes (a) (i) Complete the table above for the reaction of lithium with water. [1] (ii) The melting points of the four Group 1 metals shown above are 64 oC, 39 oC, 181 oC and 98 oC (not arranged in any sequence). Complete the table above with the correct melting points of the Group 1 metals. [1] (b) Two small 0.6 g pieces of lithium are reacted with 100 cm3 of water (an excess) at T1 oC and T2 oC respectively. The following graphs show the volume of gas produced when plotted against the time taken for the reactions. volume of gas / cm3 T1 oC T2 oC time / s (i) Use the graphs to explain whether T1 oC or T2 oC is at a higher temperature. ……………………………………………………………………………………………………. ……………………………………………………………………………………………………. ………………………