2021 SAJC Prelim P2 Question

ST ANDREW’S JUNIOR COLLEGE JC2 Preliminary Examinations Higher 2 CANDIDATE NAME CLASS 2 0 S CHEMISTRY Paper 2 Structured Questions Candidate answer on the Question Paper. Additional Materials: Data Booklet 9729/02 1 September 2021 2 hours READ THESE INSTRUCTIONS FIRST Write your name and class on all the work you hand in. Write in dark blue or black pen. You may use a HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is 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. This document consists of 19 printed pages. For Examiner’s Use Q1 9 Q2 9 Q3 24 Q4 20 Q5 13 Total 75

2 Answer all questions in the spaces provided. 1 (a) Fig. 1.1 shows a sketch of the logarithm of the first ten ionisation energies, log (IE), of element A against the number of electrons removed. Fig. 1.1 (i) Write an equation for the second ionisation energy of element A. [1] ______________________________________________________________ 0 1 2 3 4 5 6 7 8 9 10 11 log (IE) Number of electrons removed

3 (a) (ii) Explain the following features of Fig. 1.1.  the general trend in ionisation energy shown in the graph  the significant jump in values from the 5th to the 6th ionisation energy [4] ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ (iii) Element A is in Period 3. Identify element A using information from Fig. 1.1 and complete it s electronic configuration. [1] Element A is _____________ Electronic Configuration: 1s2 2s2 _______________

4 (b) Sulfur is another element in Period 3. It forms covalent bonds with other elements in covalent compounds such as SO2, SO3, SCl2. (i) Describe a covalent bond. [1] ______________________________________________________________ ______________________________________________________________ ______________________________________________________________