2024 MI PU3 MYE P3 (student)

Class Adm No Candidate Name: This document consists of 28 printed pages. 2024 Mid-Year Examination Pre-University 3 H2 CHEMISTRY 9729/03 Paper 3 Free Response 5 July 2024 2 hours Candidates answer on the Question Paper. Additional materials: Data Booklet READ THESE INSTRUCTIONS FIRST Do not turn over this question paper until you are told to do so. Write your name, class and admission number in the spaces at the top of this page. 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. Answer all questions in the spaces provided on the Question Paper. If additional space is required, you should use the pages at the end of this booklet. The question number must be clearly shown. Section A Answer all questions. Section B Answer one question. A Data Booklet is provided. The use of an approved scientific calculator is expected, where appropriate. 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. Question A B Total 1 2 3 4 5 / 6 Marks 13 15 20 12 20 80 Class Adm No

2 Section A Answer all the questions in this section. 1 Manganese is a transition metal. (a) (i) State the full electronic configuration of a manganese atom. [1] (ii) Draw the shapes of the 3dxy, 3dx2−y2 and 3dz2 orbitals of a manganese atom. Label all your orbitals clearly. [3] (iii) Compared to main Group metals, transition metals have high melting points and high boiling points. State two more properties of transition metals that are different from main Group metals. [2] ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................

3 [Turn over (b) Explain, in terms of structure and bonding, why manganese( II) oxide, MnO, and manganese(VII) oxide, Mn2O7, have such different melting points. compound melting point / °C MnO 1945 Mn2O7 6 [2] ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... (c) Mn2O7 reacts with water to form permanganic acid, HMnO4. (i) Write an equation for the reaction. [1] (ii) Suggest the type of reaction. [1] (iii) Draw the structure for Mn2O7. [1] ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................ ........................................................................................................................................

4 (d) Describe and explain the trend of atomic radii for the period 4 transition metals, starting from titanium and ending with copper. [2] ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ...........................................................................................................................