
Thermokimia 1
Authored by Rajamuddin Sidabalok
Chemistry
11th - 12th Grade
Used 10+ times

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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Peristiwa yang terjadi pada suatu reaksi endoterm adalah....
energi sistem berkurang
lingkungan menerima kalor dari sistem
ΔH negatif
sistem melepas kalor
enthalpi sistem berkurang
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Suatu campuran pereaksi di dalam tabung reaksi menyebabkan tabung tersebut menjadi panas jika dipegang. Hal ini berarti bahwa....
enthalpi pereaksi bertambah
enthalpi pereaksi berkurang
enthalpi pereaksi dan hasil reaksi bertambah
enthalpi hasil reaksi lebih besar dari enthalpi pereaksi
enthalpi pereaksi lebih besar dari enthalpi hasil reaksi
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Pada suatu percobaan, 3 L air dipanaskan sehingga suhu air naik dari 250°C menjadi 720°C. Jika diketahui massa jenis air = 1g mL-1, dan kalor jenis air = 4,2 Jg-1 0C-1, maka nilai ∆H reaksi pemanasan adalah....
+592,2 KJ
+292,2 KJ
+192,2 KJ
-592,2 KJ
-292,2 KJ
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Diketahui:
2H2(g) + O2(g) → 2H2O(l); ∆H = -572 kJ
H2O(l) → H2O(g); ∆H = +44 kJ
H2(g) → 2H(g); ∆H = +436 kJ
O2(g) → 2O(g); ∆H = +495 kJ
Maka energi ikatan rata-rata O – H adalah...
+462,7 KJ
+262,7 KJ
+131,35 KJ
-462,7 KJ
-131,35 KJ
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Diketahui reaksi: H2(g) + Br2(g) → 2HBr(g) ; ∆H = -72 kJ
Untuk menguraikan 11,2 dm3 gas HBr (STP) menjadi H2 dan Br2, kalor yang diperlukan adalah....
Jawab: 18 kJ
+18 KJ
+36 KJ
+72 KJ
-18 KJ
-36 KJ
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Diketahui reaksi :
4C + 6H2 + O2 → 2C2H5OH, ΔH = – 13,28 kkal.
Dari reaksi di atas dapat disimpulkan bahwa pembentukan 9,2 gram C2H5OH ( Ar C=12; H=1; O=16) , terjadi adalah ….
+1328 KKal
+614 KKal
-1328 KKal
-614 KKal
-307KKal
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
ΔHC3H8 = –104 kJ, ΔHCO2 = –395 kJ, ΔHH2O = –286 kJ
Persamaan reaksi pada pembakaran gas C3H8 sebagai berikut. C3H8(g) + 5O2(g) ⎯→ 3CO2(g) + 4H2O(l)
Besarnya perubahan entalpi pada pembakaran 11 gram C3H8 (Ar C = 12, H = 1) adalah....
-556,25 kJ
-278,125 KJ
-139,0625 KJ
+556,25 KJ
+278,125 KJ
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