Page 182 - MODUL KIMIA A+XPLOSIVE SPM (LATEST)

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SPM Chemistry A xplosive Module (Chemistry A Ticket For “U”) ANSWERS

P2 – Total bond energy for products
Jumlah tenaga ikatan untuk hasil tindak balas
= 6(- 391)
-1
= - 2346 kJ mol
P3 – During the breaking of chemical bonds in nitrogen gas and
hydrogen gas, a total of 2249 kJ of energy is absorbed, thus it
is endothermic reaction.
Semasa pemutusan ikatan kimia dalam gas nitrogen dan
gas hidrogen, sejumlah 2249 kJ tenaga diserap, maka
merupakan tindak balas endotermik.
P4 – During the formation of chemical bonds in ammonia gas, a
total of 2346 kJ of energy is released, thus it is exothermic
reaction.
Semasa pembentukan ikatan kimia dalam gas ammonia,
sejumlah 2346 kJ tenaga dibebaskan, maka merupakan tindak
balas eksotermik.
P5 – Heat of reaction / Haba tindak balas
= (+ 2249) + (- 2346)
-1
= - 97 kJ mol
P6 – Formation of ammonia gas is exothermic reaction.
Pembentukan gas ammonia merupakan tindak balas
eksotermik. 6

(c) Procedure / Prosidur
3
-3
P1 – Measure and pour 100 cm 1.0 mol dm copper (II) sulphate
solution into a polystyrene cup and leave it for 5 minutes.
-3
3
Ukur dan tuangkan 100 cm 1.0 mol dm larutan kuprum (II)
sulfat ke dalam cawan polistirena dan biarkan selama 5 minit.
o
P2 – Record the initial thermometer reading as T 1 C.
o
Catat bacaan termometer awal sebagai T 1 C.
P3 – Add 10g of aluminium foil balls into the polystyrene cup and
stir the mixture continuously.
Tambahkan 10 g bola kerajang aluminium ke dalam cawan
polistirena dan kacau campuran secara berterusan.
o
P4 – Record the highest final thermometer reading as T 2 C.
o
Catat bacaan termometer akhir tertinggi sebagai T 2 C.
Calculation / Penghitungan

P6 – Number of mole of CuSO 4 / Bilangan mol CuSO 4
= 1 x 100 / 1000
= 0.1 mol
P7 – Heat change / Perubahan haba
= 100 x 4.2 x (T 2 – T 1)
= 42 (T 2 – T 1) J
= 0.042 (T 2 – T 1) kJ

Sektor Pembelajaran, Jabatan Pendidikan Negeri Sabah | 2020 181