2022 KC Chem Prelims P2

Name: _____________________________ ( ) Class: _____ This question paper consists of 20 printed pages. [Turn Over CHIJ KATONG CONVENT PRELIMINARY EXAMINATIONS 2022 Secondary Four Express CHEMISTRY 6092/02 Duration: 1 hour 45 minutes Class: 405, 406 Candidates answer on the Question Paper. READ THESE INSTRUCTIONS FIRST Write your name, registration number and class on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid/ tape. Section A Answer all questions in the spaces provided. Section B Answer all three questions, the last question is in the form either/ or. Answer all questions in the spaces provided. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. 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 Paper 1 / 40 Section A / 50 Section B / 30 TOTAL / 120

CHIJ Katong Convent Prelim Exams 2022 Chemistry 6092/02 Sec 4E 2 [Turn Over Section A Answer all questions in this section in the spaces provided. The total mark for this section is 50. A1 Choose from the following oxides to answer the questions. calcium oxide iron(III) oxide lithium oxide magnesium oxide nitrogen dioxide silicon dioxide Each oxide may be used once, more than once or not at all. State which oxide (a) has a simple molecular structure, …..……………………………………………………………………………………..…………...… [1] (b) is a coloured solid, …..……………………………………………………………………………………..…………...… [1] (c) contains ions with a +1 charge, …..……………………………………………………………………………………..…………...… [1] (d) is a product of the thermal decomposition of limestone, …..……………………………………………………………………………………..…………...… [1] (e) is used in the cracking of long-chain hydrocarbons. …..……………………………………………………………………………………..…………...… [1] [Total: 5]

CHIJ Katong Convent Prelim Exams 2022 Chemistry 6092/02 Sec 4E 3 [Turn Over A2 Table 2.1 shows a list of elements and their atomic and mass numbers. Table 2.1 element A B C D E F G H atomic number 8 11 15 17 18 28 30 35 mass number 16 23 31 37 40 59 65 80 A to H are not the atomic symbols of the elements. Using the letters, A to H, choose an element which (a) forms coloured compounds, …..……………………………………………………………………………………..…………...… [1] (b) forms an anion with a charge of -2 most readily, …..……………………………………………………………………………………..…………...… [1] (c) has lower density than potassium an