H1 Chem P1_SAJC_2024_QP

1 [TURN OVER ST ANDREW’S JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATIONS HIGHER 1 CANDIDATE NAME CLASS 2 3 S CHEMISTRY Paper 1 Multiple Choice Candidate answer on the Optical Answer Sheet Additional Materials: Data Booklet 8873/01 11 September 2024 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are thirty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Optical Answer Sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 13 printed pages (including this cover page).

2 [TURN OVER 1 Oxygen exist as two isotopes; 16O and 18O respectively. Which of the following particles contain more neutrons than protons and more protons than electrons respectively? 1 12C18O32– 2 1H316O+ 3 14N18O+ A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 3 only 2 The first seven successive ionisation energies for element X are as shown. X is found in Period 3. 1st 2nd 3rd 4th 5th 6th 7th Ionisation energy / kJ mol–1 1010 1900 2900 5000 6300 21300 25400 Which compound can be formed using X? A XO B XO2 C XO3 D X4O10

3 [TURN OVER 3 Use of the Data Booklet is relevant to this question. Tl81 204 can undergo natural radioactive decay, where one of its electrons enters the nucleus to change a proton into a neutron, to form a new element X. When X is put in an ionisation chamber, it emits a high energy -particle (which is a 4He nucleus). What is the identity of the element X and the path of the emitted -particle in an electric field? X Deflection Path A X80 204 I B X82 204 II C X80 205 I D X82 205 II 4 Which statements about cyanogen molecule, (CN)2, are correct? 1 (CN)2 is polar. 2 (CN)2 is bent at the central carbon atoms. 3 A (CN)2 molecule has 3 σ and 4 π bonds. 4 A (CN)2 molecule has a total of 26 electrons. A 1, 2, 3 and 4 B 1 and 2 only C 2 and 3 only D 3 and 4 only

4 [TURN OVER 5 The structure of ice is as shown. Which statement is incorrect? A The open structure causes ice to be less dense than liquid water. B The open structure gives ice a larger mass than liquid water. C Four electrons from each oxygen are involved in forming hydrogen bonds. D Each oxygen atom in a water molecule is tetrahedrally bonded to 4 hydrogen atoms.

5 [TURN OVER 6 The structure of histamine is as shown. Which is the correct order of bond angle from smallest to largest? Smallest bond angle Largest bond angle A x y z B z y x C y z x D x z y 7 Use of the Data