Page 35 - Hybrid PBD 2022 Tg 5 - Kimia

Kimia Tingkatan 5 Bab 3

2. Tentukan perubahan suhu dalam jadual keputusan di atas.
Determine the temperature changes in the table of result above.
3. Tentukan haba pemendakan bagi argentum klorida, AgCl.
Determine the heat of precipitation for silver chloride, AgCl.
[muatan haba tentu air, c = 4.2 J kg °C ]
–1
–1
[specific heat capacity of water, c = 4.2 J kg °C ]
–1
–1
(a) Bilangan mol argentum nitrat, AgNO 3 = 0.5 × 25 = 0.0125 mol
Number of moles of silver nitrate, AgNO 3 1000 Simulasi
(b) Perubahan haba = mcθ = 50 × 4.2 × 3.8 J = 798 J Memahami Muatan
Heat change Haba Tentu, c
Understanding Specific
(c) Tuliskan persamaan ion : Ag + Cl ⎯→ AgCl Heat Capacity, c
+
–
Write the ionic equation
(d) Haba pemendakan / Heat of precipitation:
1 mol Ag bertindak balas dengan 1 mol Cl → 1 mol AgCl
+
–1
+
–1
1 mole of Ag reacts with 1 mole of Cl →1 mol of AgCl
Maka, 0.0125 mol Ag bertindak balas dengan 0.0125 mol Cl → 0.0125 mol AgCl
–1
+
–1
Hence, 0.0125 mole of Ag reacts with 0.0125 mole of Cl → 0.0125 mole of AgCl
+
798
ΔH = = −63840 J mol // −63.8 kJ mol
−1
−1
0.0125
4. Tentukan haba pemendakan bagi magnesium karbonat, MgCO 3 .
Determine the heat of precipitation for magnesium carbonate, MgCO 3 .
[muatan haba tentu air, c = 4.2 J kg °C ]
–1
–1
–1
–1
[specific heat capacity of water, c = 4.2 J kg °C ]
(a) Bilangan mol magnesium nitrat, Mg(NO 3 ) 2 = 0.5 × 25 = 0.0125 mol
1000
Number of moles of magnesium nitrate, Mg(NO 3 ) 2
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(b) Perubahan haba = mcθ = 50 × 4.2 × 10 J = 2100 J
Heat change
(c) Tuliskan persamaan ion: Mg + CO 3 → MgCO 3
2−
2+
Write the ionic equation
(d) Haba pemendakan / Heat of precipitation:
2+
2−
1 mol Mg bertindak balas dengan 1 mol CO 3 → 1 mol MgCO 3
1 mole of Mg reacts with 1 mole of CO 3 → 1 mole of MgCO 3
2−
2+
Maka, 0.0125 mol Mg bertindak balas dengan 0.0125 mol CO 3 → 0.0125 mol MgCO 3
2−
2+
Hence, 0.0125 mole of Mg reacts with 0.0125 mole of CO 3 → 0.0125 mole of MgCO 3
2−
2+
ΔH = 2100 = +168000 J mol // +168 kJ mol −1
−1
0.0125
5. Lukis gambar rajah aras tenaga bagi pemendakan argentum klorida dan magnesium karbonat.
Draw the energy level diagrams for the precipitation of silver chloride and magnesium carbonate.
Ag + CI –
+
Gambar rajah aras tenaga bagi pemendakan Tenaga
argentum klorida Energy ΔH= –63.8 kJ mol –1
Energy level diagram for the precipitation of silver chloride AgCI
MgCO
Gambar rajah aras tenaga bagi pemendakan 3
magnesium karbonat Tenaga
Energy level diagram for the precipitation of magnesium Energy ΔH= +168 kJ mol –1
2+
carbonate Mg + CO 3 2–
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