Page 50 - Nilam_Publication_module_Chemistry_Form.pdf

MODULE • Chemistry Form 4

9 The diagram below shows the set-up of apparatus to 11 The equation shows a decomposition of magnesium
determine the empirical formula of an oxide metal X. nitrate when heated.
Rajah di bawah menunjukkan susunan radas bagi menentukan Persamaan di bawah menunjukkan penguraian nitrat apabila
formula empirik oksida logam X. dipanaskan.

2Mg(NO ) 2MgO + 4NO + O
Metal X 3 2 2 2
Logam X What is the number of oxygen molecules is produced
when 7.4 g magnesium nitrate decomposed when
heated.
Heat [Relative formula mass of Mg(NO ) = 148;
3 2
Panaskan Avogadro constant = 6.02 × 10 mol ]
23
–1
Which of the following is metal X? Berapakah bilangan molekul oksigen apabila 7.4 g magnesium
Antara berikut, yang manakah mungkin bagi logam X? nitrat terurai apabila dipanaskan?
A Zinc C Tin [Jisim formula relatif Mg(NO ) = 148; Pemalar Avogadro =
Zink Stanum 6.02 × 10 mol ] 3 2
–1
23
B Lead D Copper A 1.505 × 10 22
Plumbum Kuprum B 3.010 × 10
22
C 1.505 × 10 23
10 The following equation shows the decomposition reaction D 3.010 × 10 23
of lead(II) nitrate when heated at room temperature and
pressure. 12 The equation below shows the chemical equation of the
Persamaan tindak balas di bawah menunjukkan penguraian combustion of ethanol in excess oxygen.
plumbum(II) nitrat apabila dipanaskan pada suhu dan tekanan
bilik. Persamaan di bawah menunjukkan persamaan kimia pembakaran
etanol dalam oksigen berlebihan.
2Pb(NO ) 2PbO + 4NO + O
3 2
2
2
2C H OH + 6O 4CO + 6H O
Which of the following are true when 0.1 mol of lead(II) 2 5 2 2 2
nitrate is decomposed? What is the volume of carbon dioxide gas released when
[Relative atomic mass: N = 14, O = 16, Pb = 207 9.20 g ethanol burnt completely?
and 1 mol gas occupies the volume of 24 dm at room [Relative atomic mass of H = 1, C = 12, O = 16, 1 mol
3
3
temperature and pressure] of gas occupies 24 dm at room condition]
Antara berikut, yang manakah adalah benar apabila 0.1 mol Apakah isi padu gas karbon dioksida dibebaskan apabila 9.20 g
plumbum(II) nitrat terurai? etanol terbakar lengkap?
[Jisim atom relatif: N = 14, O = 16, Pb = 207 dan 1 mol gas [Jisim atom relatif: H = 1, C = 12, O = 16, 1 mol gas menempati
3
menempati isipadu 24 dm pada suhu dan tekanan bilik] 24 dm pada keadaan bilik]
3
I 66.2 g of lead(II) oxide is formed A 4.8 cm 3
3
66.2 g plumbum(II) oksida terbentuk B 9.6 cm
II 22.3 g of lead(II) oxide is formed C 96.0 cm 3
22.3 g plumbum(II) oksida terbentuk D 9 600 cm 3
3
III 2.4 dm of oxygen gases is given off
2.4 dm gas oksigen dibebaskan 13 What is the percentage by mass of nitrogen content in
3
IV 4 800 cm of nitrogen dioxide given off urea, CO(NH ) ? [Relative atomic mass: C = 12, N = 14,
3
2 2
4 800 cm nitrogen dioksida dibebaskan H = 1 and O = 16]
3
A I and III only Apakah peratus kandungan nitrogen mengikut jisim dalam urea,
I dan III sahaja CO(NH ) ? [Jisim atom relatif: C = 12, N = 14, H = 1 dan
B I and IV only O = 16] 2 2
I dan IV sahaja A 23.3%
C II and III only B 31.8%
II dan III sahaja C 46.7%
D II and IV only D 63.6%
II dan IV sahaja

48
Nilam Publication Sdn. Bhd.

02-Chem F4 (3P).indd 48 12/9/2011 5:59:10 PM