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英皇_2006_mock_chem_I_ANS_alan

英皇_2006_mock_chem_...

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Prepared by Alan Cheng CHEMISTRY Paper 1 Suggested Answer Alan Cheng Alan Cheng z 經驗理科名師 畢業於香港科技大學化學系 ,獲 榮譽理學士,香港大學 頒授教師專業資格。 z 人氣急升 近年學生人數不斷上升,教學方法大 獲好評,贏盡口碑 ,更被譽為新一代化學科補 習名師 z 擁有多年教學經驗,並連續五年擔任英皇教育 日校化學科科主任 一職。 z 曾於明報教育網 中解答會考生的問題。 z 曾任多間名校學生補習教師 ,對於爭取好成 績,有一套獨特心得。 z 2005 年中學會考化學科 Tip 中大量題目 ,並 包括 Q12. essay ( 傳意題 ) z 2005 年會考十優狀元 Timophy Un 由中三至中 五一直報讀 Alan Cheng ,絕對是尖子的最佳選 擇。
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Suggested Solution Paper I Section A 1. (a) X and W or X and Y 1 or 0 1 (b) Group II 1 Because X has 2 electrons in its outermost shell / X is magnesium 1 (c) (i) Isotopes of the same element 1 (ii) Yes, because W and Y are the same element / are isotopes. 1 (iii) Cl 2 + 2NaOH Æ NaCl + NaOCl + H 2 O 1 2. (a) (i) Iron 1 (ii) Fe + 2HCl Æ FeCl 2 + H 2 1 It is a redox reaction. 1 Because the oxidation number of Fe changes from 0 to +2 1 OR, The oxidation number of H changes from +1 to 0 (1) (b) (i) Dirty green 1 (ii) Fe 2+ + 2OH - Æ Fe(OH) 2 1 (c) (i) Metal displacement reaction 1 (ii) Calcium reacts with water in solution B to form hydrogen gas. 1 3. (a) Addition polymerization 1 Because the monomer is unsaturated hydrocarbon. 1 (b) Repeating unit: 1 H C C CH 2 CH 3 H H 1
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Equation: 1 CH H CH H C C 2 CH 3 H H C C 2 CH 3 H H n n
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