Page 61 - Hybrid PBD 2022 Tg 4 - Kimia

Kimia Tingkatan 4 Bab 7
6. Seorang murid telah menjalankan eksperimen untuk menentukan kadar tindak balas antara serbuk zink
dengan asid sulfurik. Isi padu gas hidrogen yang terbebas direkodkan dalam jadual di bawah.
A pupil conducted an experiment to determine the rate of reaction between zinc powder and sulphuric acid. The volume of the hydrogen gas
released was recorded in the table below. SP 7.1.5 TP4 KBAT Menganalisis

Masa (s)
Time (s) 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0
Isi padu gas (cm ) 0.00 7.00 12.00 15.00 18.00 20.00 21.00 22.00 22.00 22.00
3
3
Volume of gas (cm )
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(a) Plotkan graf isi padu gas melawan masa.
Plot a graph of volume of gas against time.
Isi padu gas (cm )
3
Volume of gas (cm ) 3

30.0

25.0

20.0

15.0

10.0

5.0

Masa (s)
0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 Time (s)

(b) Hitung kadar tindak balas purata:
Calculate the average rate of reaction:
(i) Dalam minit pertama
In the first minute
15 = 0.25 cm s –1
3
60

(ii) Bagi keseluruhan tindak balas
For the overall reaction
22
= 0.16 cm s –1
3
140
(c) Hitung kadar tindak balas pada 40 s.
Calculate the rate of reaction at 40 s.

[Lukis tangent pada 40 s, tentukan kecerunan]
[Draw a tangent at 40 s, determine the gradient]
20 – 4
= 0.20 cm s –1
3
80 – 0
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07 Bab 7.indd 168 10/29/21 5:18 PM