: RATE OF REACTION (SECTION A)
SET 3 : RATE OF REACTION (SECTION A)
1. A group of students carry out two set of experiment, Set I and Set II to determine the rate of reaction
3 between 40 cm -3 of 0.1 mol dm hydrochloric acid with excess zinc. Table 1 shows the results for the volume of hydrogen gas collected at every 30 second.
Sekumpulan pelajar menjalankan dua set eksperimen, set
I dan II dalam menentukan kadar satu tindak balas
3 antara -3 40 cm asid hidroklorik 0.1 mol dm dan zink yang berlebihan . Jadual
1 menunjukkan keputusan ekperimen pada isi padu gas hidrogen yang dikumpulkan pada setiap 30 saat.
SET I :
Time / s
240 270 Masa / s Total volume of hydrogen gas
0.00 7.00 13.50 19.50 24.50 30.00 34.50 39.00 42.00 42.00 collected Jumlah isi padu gas hidrogen yang
dikumpul 3 (cm )
SET II :
240 270 Masa / s Total volume of hydrogen gas
Time / s
0.00 11.00 19.50 27.00 33.50 38.50 42.00 42.00 42.00 42.00 collected Jumlah isi padu gas hidrogen yang
dikumpul 3 (cm )
Table 1 [Jadual 1]
(a) Based on result in Set I and Set II in Table 1 Berdasarkan keputusan dalam Set I dan Set II dalam Jadual 1.
(i) State which set of the experiment has higher rate of reaction . Nyatakan set eksperimen yang manakah menghasilkan kadar tindak balas yang tinggi
................................................................................................................................................ [1 mark]
(ii) Draw a graph of total volume of hydrogen gas collected against time for Set I and Set II on the same axes. Lukiskan graf jumlah isi padu gas hidrogen yang dikumpul melawan masa bagi Set I dan Set II
pada paksi yang sama. [4 marks]
(b) (i) By using the graph you have drawn in (a)(ii), determine the rate of reaction at 60 seconds for Set I and Set II Dengan menggunakan graf yang telah diplotkan di (b), tentukan kadar tindak balaspada 90 saat bagi ke dua-dua set
(ii) Suggest two ways to obtain curve in Set II
2. A student carried out Experiment I and II to investigate the factors affecting the rate of reaction between calcium carbonate and nitric acid.
Table 2.1 shows the results of the experiment.
Seorang pelajar menjalankan Eksperimen
I dan II untuk mengkaji faktor-faktor yang mempengaruhi kadar tindak balas antara kalsium karbonat dan asid nitrik . Jadual 1 menunjukkan keputusan eksperimen itu.
Excess of calcium carbonate granules Excess of calcium carbonate powder and
3 -3 and 50 cm of 0.2 mol dm nitric acid 50 cm of 0.2 mol dm nitric acid Reactants
3 -3
Bahan tindak Ketulan kalsium karbonat berlebihan Serbuk kalsium karbonat berlebihan
3 -3
3 balas -3 dengan 50 cm asid nitrik 0.2 mol dm dengan 50 cm asid nitrik 0.2 mol dm
Time taken for the maximum volume of gas collected (minute)
10.0 5.0 Masa yang diambil untuk mengumpul isi padu maksimum gas (minit)
Table 2.1 /Jadual 2.1
(a) Write the chemical equation for the reaction between calcium carbonate and nitric acid. Tuliskan persamaan kimia bagi tindak balas antara kalsium karbonat dengan asid nitrik
.............................................................................................................................................. [2 marks] (b)
Draw the apparatus set-up to carry out this experiment. Lukiskan gambar rajah susunan radas untuk menjalankan eksperimen ini.
[2 marks] (c)
Calculate the maximum volume of gas collected in this experiment
3 [Molar gas volume: 24 dm -1 mol at room condition] Hitungkan isi padu maksimum gas yang dikumpulkan dalam eksperimen ini .
3 [Isi padu molar gas: 24 dm -1 mol pada keadaan bilik]
[3 marks]
3 (d) -1 Calculate the average rate of reaction for Experiment I and Experiment II in cm s .
3 -1 Hitungkan kadar tindak balas purata bagi Eksperimen I dan II dalam cm s .
(i) Experiment I Eksperimen I
(ii) Experiment II Eksperimen II
[2 marks]
(e) (i) Compare the rate of reaction between Experiment I and Experiment II. Bandingkan kadar tindak balas antara Eksperimen
I and Eksperimen II.
[1 mark] (ii) Explain your answer in (e)(i) based on the Collision Theory.
Terangkan jawapan anda di (e)(i) berdasarkan Teori Perlanggaran.