CH. 8

Page 14

MODULE • Chemistry FORM 4

(ii) What is the type of reaction that takes place? Apakah jenis tindak balas yang berlaku? Neutralisation / Peneutralan (iii) State one important use of compound Z. Nyatakan satu kegunaan penting sebatian Z. Fertiliser / Baja (iv) Calculate the percentage by mass of nitrogen in compound Z. [Relative atomic mass: N = 14, S = 32, O = 16, H = 1] Hitungkan peratusan jisim nitrogen dalam sebatian Z. [Jisim atom relatif: N = 14, S = 32, O = 16, H = 1] 2

%N =

2 × 14 2(14 + 4 × 1) + 32 + 4 × 16

× 100% = 21.2%

The table shows the examples and component of four types of manufactured substances in industry. Jadual berikut menunjukkan contoh-contoh dan komponen bagi empat jenis bahan buatan dalam industri. Type of manufactured substances Jenis bahan buatan

Example Contoh

P

Reinforced concrete to build building Konkrit yang diperkukuhan untuk membina bangunan

Cement, sand, small pebbles and steel Simen, pasir, batu kecil dan keluli

Q

Medal made from bronze Pingat yang diperbuat daripada gangsa

Copper and tin Kuprum dan stanum

Polymer Polimer

Pipe made from R polymer Paip yang diperbuat daripada polimer R

Chloroethene Kloroetena

Bottles made from S type of glass Botol yang diperbuat daripada kaca jenis S

Silicon dioxide, sodium carbonate, calcium carbonate Silikon dioksida, natrium karbonat, kalsium karbonat

Glass Kaca

Component Komponen

(a) State the name of P, Q, R and S. Namakan P, Q, R dan S. Composite materials / Bahan komposit P: Alloy / Aloi Q:

Polyvinyl chloride / Polivinil klorida R: Soda-lime glass / Kaca soda kapur S:

(b) (i) State two uses of reinforced concrete. / Nyatakan dua kegunaan konkrit yang diperkukuhkan. To make framework of buildings and bridges. Membuat rangka bangunan dan jambatan. (ii) What is the advantage of using reinforced concrete compared to concrete? Apakah kelebihan konkrit yang diperkukuhkan berbanding dengan konkrit? Reinforced concrete can withstand higher pressure/support heavier loads/stronger/higher tensile strength than concrete. Konkrit yang diperkukuhkan dapat menahan tekanan yang tinggi/ menyokong muatan berat/lebih kuat/ kekuatan daya tegangan yang lebih tinggi daripada konkrit. (c) (i) Draw the arrangement of particles in / Lukis susunan atom dalam Pure copper Kuprum tulen

Bronze Gangsa

UNIT

Copper Kuprum

8

Copper Kuprum

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08 Chap 8 ChemF4 Bil 2017(CSY5p).indd 204

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10/10/2017 5:43 PM


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