2022 YIJC H2 CHEM PRELIM P1 MS

©YIJC [Turn over YISHUN INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME TEACHER’S COPY CG INDEX NO CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 14 September 2022 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. Write your name and class on the Answer Sheet in the spaces provided unless this has been done for you. 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 Answer Sheet. Read the instructions on the Answer Sheet very carefully. 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 16 printed pages.

©YIJC [Turn over 2 1 Use of the Data Booklet is relevant to this question. The table shows the fifth, sixth, seventh, eighth and ninth ionisation energies of an element in the third period. 5th 6th 7th 8th 9th ionisation energy / kJ mol−1 6270 21270 25430 29870 35920 Which element has these ionisation energy values? A P B S C Cl D Ar Answer: A The element is P as there is a large jump between the 5th and 6th ionisation energies as seen in this table. The 6th electron for P is removed from an inner principal quantum shell. 2 Two elements X and Y have the following properties: • X and Y form ionic compounds Na2X and Na2Y respectively. • Element Y forms YF6 molecule whereas X is not able to do so. Which pair of electronic configurations for X and Y is correct? X Y A [He] 2s2 2p4 [He] 2s2 2p2 B [He] 2s2 2p2 [He] 2s2 2p6 3s2 3p3 C [He] 2s2 2p2 [He] 2s2 2p6 3s2 3p2 D [He] 2s2 2p4 [He] 2s2 2p6 3s2 3p4 Answer: D Compounds Na2X and Na2Y show that X and Y forms anions of −2 charge so it means that they have 6 electrons in their valence shell. Y must be a period three element in order for YF6 to exist as it has an expanded octet structure.

©YIJC [Turn over 3 3 Use of the Data Booklet is relevant to this question. An element G forms an ionic nitrate with formula G(NO3)2. In a sample of this compound, the ion G contains 80 electrons and 126 neutrons. Which row describes: • the Group where G is found, • the nucleon number of G in this sample? Group nucleon number A 2 204 B 2 208 C 14 204 D 14 208 Answer: D The formula G(NO3)2 shows that element G can form a +2 cation. G atom has 82 el