AJC_H1_CHEM_P2_QP

AJC JC2 PRE NAME:__ CHEMIS Higher 1 Paper 2 Candidates Additional M READ TH Write your Write in dar You may us Do not use Section A Answer all Section B Answer tw o Start each At the end The numbe Paper (33% / ELIM 2015 _________ STRY s answer Se Materials: ESE INST name, PDG rk blue or b se a pencil staples, pa the questio o questions question on of the exam er of marks r 1 %) Q /30 AND 2015 JC _________ ection A on Data Bo Writing TRUCTION G and regist lack pen. for any diag aper clips, h ons. s on separa n a fresh sh mination, fas is given in b S Q1 Q This DERSON C 2 PREL _________ the Questio ooklet paper NS FIRST ter number grams, grap highlighters, te writing pa eet of pape sten all your brackets [ ] For Section A Q2 Q 3 document c 8872/02/H1 N JUNIO LIMINARY _____ on Paper. on all the w phs or roug , glue or cor aper. er. r work secu ] at the end Examiner’ Pap 3 Q4 Fina G consists of 1 OR COL Y EXAMI work you ha h working. rrection fluid urely togethe of each qu s Use per 2 (67% Sec al marks Grade 14 printed p LEGE NATION nd in. d. er. estion or pa %) ction B pages. S PDG 16 Septe art question T / 1 [Turn ov :_____ /14 8872/02 ember 2015 2 hours n. Total / 80 100 ver 4 2 5 s

AJC JC2 PRELIM 2015 8872/02/H1 2 Section A Answer all the questions in this section in the spaces provided. 1 (a) Na, Si and P are elements found in the third period of the Periodic Table. The ionic radii of Na, Si and P are listed in the Data Booklet. State and explain the differences between the (i) ionic radii of Na and Si …………………………………………………………………………………………………… …………………………………………………………………………………………………… (ii) ionic radii of Si and P …………………………………………………………………………………………………… …………………………………………………………………………………………………… [3] (b) A, B, C and D are oxides of the third period elements. Some properties of the oxides are given in the table. oxide melting point / oC electrical conductivity when molten reaction with H2O resulting pH A 2850 good very little 8 B 1720 poor none 7 C 1280 good exothermic 14 D 580 poor exothermic 1 (i) The structures of A, B, C and D can be simple or giant, and their bonding can be covalent or ionic. Use these terms to describe the structure and bonding in each of the oxides A, B, C and D. Structure Bonding A …….……………………… …….……………………… B …….……………………… …….……………………… C …….……………………… …….……………………… D …….……………………… …….………………………

3 AJC JC2 PRELIM 2015 8872/02/H1 [Turn over (ii) Hence, suggest possible identities of A, B, C and D. Identity A …….……………………… B …….……………………… C …….……………………… D …….……………………… [4] (c) The melting points of sodium chlori de and silicon tetrachloride are 801 oC and –70 oC respectively. Explain the difference in the melting points in terms of the structure of, and bonding in, the two