Page 30 - Hybrid PBD 2022 Tg 5 - Kimia

Kimia Tingkatan 5 Bab 3

Bahan / Materials :
Pepejal natrium hidroksida, pepejal kalsium klorida kontang, pepejal ammonium sulfat, pepejal natrium
tiosulfat, dan air suling.
Solid sodium hydroxide, solid anhydrous calcium chloride, solid ammonium sulphate, solid sodium thiosulphate and distilled water.
Radas / Apparatus :
Cawan polistirena dan penutup, silinder penyukat, termometer, dan spatula.
Polystyrene cup and cover, measuring cylinder, thermometer and spatula.
Prosedur / Procedure :
1. Tuang 20 cm air suling ke dalam cawan polistirena. Rekodkan suhu awal.
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3
Pour 20 cm of distilled water into the polystyrene cup. Record the initial temperature.
3
2. Masukkan satu spatula natrium hidroksida. Kacau campuran dan rekodkan suhu tertinggi.
Put in one spatula of sodium hydroxide. Stir the mixture and record the highest temperature.
3. Ulang langkah 1 hingga 3 dengan bahan yang lain.
Repeat steps 1 to 3 with other substances.
Keputusan / Result:
Suhu awal Suhu tertinggi Perubahan suhu
Bahan Initial temperature Highest temperature Temperature change
Substance
(°C) (°C) (°C)
(a) Natrium hidroksida 30.0 42.0 +12.0
Sodium hydroxide
(b) Kalsium klorida kontang 30.0 27.0 –3.0
Anhydrous calcium chloride
(c) Ammonium sulfat 30.0 20.0 –10.0
Ammonium sulphate
(d) Natrium tiosulfat 30.0 35.0 +5.0
Sodium thiosulphate
Soalan / Questions: Video
Perubahan Suhu Semasa
1. Tentukan perubahan suhu dalam jadual keputusan di atas. Melarutkan Bahan Kimia
Determine the temperature change in the table of result above. Temperature Changes in
Dissolving Chemicals
2. Tentukan tindak balas yang membebaskan haba dan menyerap haba.
Determine the reactions that release heat and absorb heat.
Membebaskan haba Menyerap haba
Release heat Absorb heat
Melarutkan natrium hidroksida dan natrium Melarutkan kalsium klorida kontang dan
tiosulfat di dalam air suling. ammonium sulfat di dalam air suling.
Dissolving sodium hydroxide and sodium thiosulphate in Dissolving anhydrous calcium chloride and ammonium
distilled water. sulphate in distilled water.

3. Kelaskan tindak balas di (b) sebagai tindak balas eksotermik atau tindak balas endotermik.
Classify the reactions di (b) as exothermic reaction or endothermic reaction.
Tindak balas eksotermik Tindak balas endotermik
Exothermic reaction Endothermic reaction
Melarutkan natrium hidroksida dan natrium Melarutkan kalsium klorida kontang dan
tiosulfat di dalam air suling. ammonium sulfat di dalam air suling.
Dissolving sodium hydroxide and sodium thiosulphate in Dissolving anhydrous calcium chloride and ammonium
distilled water. sulphate in distilled water.

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