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C The rate of reaction at t 2 second is higher than t 1 second
Kadar tindak balas pada t2 saat lebih tinggi dari t1 saat
3 -1
D The rate of reaction at t 1 second is 1/ 1 cm s
3 -1
Kadar tindak balas pada t1 saat ialah 1/ 1 cm s

31 The following chemical equation represents the reaction between calcium carbonate
and nitric acid.
Persamaan kimia berikut menunjukkan tindak balas antara kalsium karbonat dan asid
nitrik.
CaCO + 2 HNO → Ca(NO ) + CO + H O
3
3
2
2
3 2

Which of the following factors increases the rate of reaction?
Antara faktor-faktor berikut, yang manakah meningkatkan kadar tindak balas
tersebut?

A Use copper(II) sulphate solution as a catalyst
Menggunakan larutan kuprum(II) sulfat sebagai mangkin
B Increase the volume of nitric acid
Meningkatkan isipadu asid nitrik
C Add water into the nitric acid
Menambahkan air kepada asid nitrik
D Use calcium carbonate powder
Menggunakan serbuk kalsium karbonat

32 Table 3 shows the total volume of hydrogen gas, collected at regular intervals for the
reaction between magnesium and dilute nitric acid.
Jadual 3 menunjukkan jumlah isi padu gas hidrogen, yang dikumpul pada sela masa
yang sekata bagi tindak balas antara magnesium dan asid nitrik.

Table 3 / Jadual 3

What is the average rate of reaction?
Berapakah kadar tindak balas purata?
-1
3
-1
3
A 0.10 cm min C 10.60 cm min
-1
3
3
B 7.70 cm min -1 D 37.40 cm min

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