MI Prelim H1 Chem P2 QP_for exchange

Class Adm No Candidate Name: This document consists of 22 printed pages and 2 blank pages. 2025 Preliminary Examination Pre-University 2 H1 CHEMISTRY 8873/02 Paper 2 Structured Questions 27 August 2025 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. Section A Answer all the questions. Section B Answer one question. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. Question Section A Section B Total 1 2 3 4 5 / 6 Marks 19 11 22 8 20 80 H Class Adm. No.

2 Section A Answer all the questions in this section in the spaces provided. 1 (a) Graphene is a nanomaterial. (i) Draw a diagram to represent part of a graphene layer which contains at least five complete rings of carbon atoms. [1] (ii) Graphene has high tensile strength. Explain what this means. ...................................................................................................................................... ..................................................................................................................................[1] (iii) Explain why graphene has high tensile strength. ...................................................................................................................................... ..................................................................................................................................[1] (iv) Graphene is able to conduct electricity. Explain why. ...................................................................................................................................... ...................................................................................................................................... ..................................................................................................................................[1]

3 [Turn over (b) Nickel catalyses a reaction between methane and steam. (i) State the electronic configuration of Ni. 1s2 ............................................................................................................................[1] (ii) Outline the mode of action as nickel catalyses the reaction between methane and steam. Include bond forming and