MARK SCHEME
UJIAN PENGESANAN 1 KIMIA TING. 5 (2018)
SECTION A / BAHAGIAN A
1. C
6. D
11. C
2. A
7. B
12. B
3. A
8. A
13. B
4. D
9. D
14. B
5. A
10. D
15. C Total = 15 marks
SECTION B / BAHAGIAN B
Question 1
Mark Scheme
Marks
(a)
A chemical / substance that changes / alters / increases the rate of reaction Suatu bahan (kimia) yang mengubah / menambah / meningkatkan kadar tindak balas r : substance that affect rate of reaction // substance that speeds up or slow down the rate of reaction
1
(b)
Copper(II) sulphate Kuprum(II) sulfat
1
Set I : 30 cm3 // 15 cm3 min-1 // 30 cm3 // 0.25 cm3 min-1 2 min 120 s
1
Set II : 50 cm3 // 25 cm3 min-1 // 50 cm3 // 0.417 cm3 min-1 2 min 120 s
1
The rate of reaction in Set II is higher than in Set I Kadar tindak balas dalam Set II lebih tinggi berbanding dalam Set I r : The rate of reaction in Set II is faster than in Set I // Kadar tindak balas dalam Set II lebih cepat berbanding dalam Set I a : The rate of reaction in Set II is higher // Kadar tindak balas dalam Set II lebih tinggi
1
(c)(i)
(c)(ii)
(c)(iii) [any 2 points] 1. Catalyst lowers / decreases / reduces the activation energy Mangkin merendahkan tenaga pengaktifan 2. More colliding particles achieve the activation energy Lebih banyak zarah mencapai tenaga pengaktifan itu 3. Frequency of effective collision increases Frekuensi perlanggaran berkesan meningkat
1 1 1 Max. : 2 1
MARK SCHEME
(d)(i) & (d)(ii)
UJIAN PENGESANAN 1 KIMIA TING. 5 (2018)
Label curves for Set I and Set II
1
Label for EI Label for EII
1 1
Total Question 2
(a)
(b)
10
Mark Scheme
Marks
1. The rate of reaction in Set II is higher than in Set I Kadar tindak balas dalam Set II lebih tinggi berbanding dalam Set I 2. The temperature of reaction in Set II is higher than in Set I Suhu tindak balas dalam Set II lebih tinggi berbanding Set I 3. Kinetic energy of particles increases in Set II compared to Set I Tenaga kinetik zarah-zarah dalam Set II lebih tinggi berbanding Set I 4. Frequency of collision between zinc atoms and hydrogen ions in Set II increases / is higher Frekuensi perlanggaran antara atom zink dan ion hidrogen dalam Set II meningkat / lebih tinggi 5. Frequency of effective collision between zinc atoms and hydrogen ions in Set II increases / is higher Frekuensi perlanggaran berkesan antara atom zink dan ion hidrogen dalam Set II meningkat / lebih tinggi Total
1
1. The rate of reaction in Set III is higher than in Set II Kadar tindak balas dalam Set III lebih tinggi berbanding dalam Set II
1
1 1
1
1
5
2
MARK SCHEME
(c)
2. The concentration of sulphuric acid in Set III is higher than in Set II Kepekatan asid sulfurik dalam Set III lebih tinggi berbanding Set II 3. The number of H+ ions per unit volume in Set III is higher compared to Set II Bilangan ion H+ per isi padu dalam Set III lebih tinggi berbanding Set II 4. Frequency of collision between zinc atoms and hydrogen ions in Set III increases / is higher Frekuensi perlanggaran antara atom zink dan ion hidrogen dalam Set III meningkat / lebih tinggi 5. Frequency of effective collision between zinc atoms and hydrogen ions in Set III increases / is higher Frekuensi perlanggaran berkesan antara atom zink dan ion hidrogen dalam Set III meningkat / lebih tinggi Total
1
1. Correct X-axis + unit: Time / s Paksi-X betul + unit: Masa / s 2. Correct Y-axis + unit: Volume of (hydrogen) gas / cm3 Paksi-Y betul + unit: Isi padu gas (hidrogen) / cm3 3. Correct curve I 4. Correct curve II 5. Correct curve III Sample answer:
1
Question 3
UJIAN PENGESANAN 1 KIMIA TING. 5 (2018)
Mark Scheme
1
1
1
5
1 1 1 1
Total
5
Total
15 Marks
(a)
Alkene Alkena
1
(b)
CnH2n n = 2, 3, 4‌
1
(c)
1. The size of alkene molecules increases Saiz molekul alkena bertambah
1 3
MARK SCHEME
UJIAN PENGESANAN 1 KIMIA TING. 5 (2018)
2. The intermolecular / Van der Waals forces become stronger Daya antara molekul / Van der Waals bertambah kuat 3. More heat is required to overcome the forces of attraction Lebih banyak haba diperlukan untuk mengatasi daya itu
1 1 Total
5
SECTION C / BAHAGIAN C
1
1. Factor: size of calcium carbonate / CaCO3 Faktor: saiz kalsium karbonat / CaCO3 2. Fill a burette with water and invert it over water in a basin Penuhkan buret dengan air dan telangkupkan di atas air dalam besen 3. Record initial reading of burette Rekod bacaan awal buret 4. Measure 50 cm3 of 1.0 mol dm-3 hydrochloric acid Sukat / ukur 50 cm3 asid hidroklorik 1.0 mol dm-3 5. Pour the acid in a conical flask Tuang asid it uke dalam kelalang kon 6. Weigh / measure 5 g calcium carbonate powder and put into the conical flask Timbang / sukat 5 g serbuk kalsium karbonat dan letakkan ke dalam kelalang kon 7. Start the stopwatch Mulakan jam randik 8. Record the burette reading at intervals of 30 seconds Rekod bacaan buret pada sela masa 30 saat 9. Functional diagram – dashed lines in water & HCl, cork, delivery tube, retort stand 10. Label – CaCO3, HCl & water
1 1 1 1 1 1
1 1 1 1
4
MARK SCHEME
UJIAN PENGESANAN 1 KIMIA TING. 5 (2018)
OR
1. Factor: concentration of hydrochloric acid / HCl Faktor: kepekatan asid hidroklorik / HCl 2. Fill a burette with water and invert it over water in a basin Penuhkan buret dengan air dan telangkupkan di atas air dalam besen 3. Record initial reading of burette Rekod bacaan awal buret 4. Measure 25 cm3 of 2.0 mol dm-3 hydrochloric acid Sukat / ukur 25 cm3 asid hidroklorik 2.0 mol dm-3 5. Pour the acid in a conical flask Tuang asid it uke dalam kelalang kon 6. Weigh / measure 5 g granulated calcium carbonate and put into the conical flask Timbang / sukat 5 g ketulan kalsium karbonat dan letakkan ke dalam kelalang kon 7. Start the stopwatch Mulakan jam randik 8. Record the burette reading at intervals of 30 seconds Rekod bacaan buret pada sela masa 30 saat 9. Functional diagram – dashed lines in water & HCl, cork, delivery tube, retort stand 10. Label – CaCO3, HCl & water
5
MARK SCHEME
UJIAN PENGESANAN 1 KIMIA TING. 5 (2018)
Note: The number of moles of HCl used in Exp. II must remain the same as in Exp. I. Therefore when the concentration of HCl is increased, the volume must be reduced Note 1: if catalyst is used, consider P2, P3, P4, P5 & P9 only Note 2: if syringe is used to collect gas, no marks for P2, P8, P9 & P10 Note 3: if measuring cylinder is used to collect gas, no marks for P8, P9 & P10 Note 4: if factor is temperature, consider P2, P3, P5, P9 only Total
10
END OF MARK SCHEME
Prepared by:
Checked by:
Verified by:
......................................................... (CIK INTAN ZAREENA ZAHEDI)
......................................................... (PN. NURRUL ‘AINNI MD. TENI)
................................................. (PN. NORLIZA MD DERUS)
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