k2 esei mudah.docx

BAHAGIAN B[ 20 MARKAH ] 7 (a) What is meant by empirical formula? Apakah yang d imaksudkandengan formula emp irik? [2 marks] (b) Table 7.1 shows molecular formula for three co mpounds. Jadual 7.1 menu njukkan formula molekulbagitigasebatian. Compounds Sebatian Molecular formula Formula molekul Butane Butana C 4 H 10 Ethanoic acid Asidetanoik CH 3 COOH Ethyl ethanoate Etiletanoat CH 3 COOCH 2 CH 3 Table 7.1 / Jadual 7.1 Based on the table 7.1, write the empirical formula for butane, ethanoic acid and ethyl ethanoate. Berdasarkanjadual 7.1, tulis formula empirikbagibutana, asidetanoikdan etiletanoat. [3 marks] Diagram 7.1 shows the set up apparatus for an experiment to determine the empirical formula of magnesium oxide. Rajah 7.1 menun jukkanradasuntuksuatueksperimenbagimenentukan formula empirik magnesium oksida Result Keputusan Mass / Jisim ( g ) Crucible + lid Mangkukpijar + penutu p = 18.30 Crucible + lid + magnesium ribbon Mangkukpijar + penutu p + pita magnesium = 19.20 Crucible + lid + magnesium oxide Mangkukpijar + penutu p + magnesium oxide = 19.80 Table 7.2 / Jadual 7.2 Magnesium ribbon Pita magnesium Lid / penutup Crucible Mangkukpijar Heat Panaskan Diagram 7.1 Rajah 7.1

k2 esei mudah.docx

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