
KIMIA 11 S2 HAL 024
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Chemistry
11th Grade

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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Tulislah persamaan termokimia pembakaran etanol yang melepaskan kalor sebesar 1.350 kJ/mol!
C2H5OH(I) + 3O2(g) → 2CO2(g) + 3H2O(g)
ΔHC° = -1350 kJ/mol
C2H5OH(I) + 4O2(g) → 2CO2(g) + 2H2O(g)
ΔHC° = -1050 kJ/mol
C2H5OH(I) + 3O2(g) → 3CO2(g) + 3H2O(g)
ΔHC° = -2150 kJ/mol
C2H5OH(I) + 3O2(g) → 2CO2(g) + 1H2O(g)
ΔHC° = -1150 kJ/mol
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Apakah yang dimaksud dengan perubahan entalpi standar?
Perubahan entalpi yang menyertai pembentukan 1 mol H2O dari reaksi penetralan asam basa
Penentuan perubahan entalpi pada kondisi standar (tekanan 1 atm dan suhu 25⁰C)
perubahan entalpi yang terjadi pada pembakaran 1 mol senyawa dengan oksigen menjadi oksidanya pada keadaan standar
Perubahan entalpi berharga positif (+) artinya reaksi berlangsung endoterm atau sistem membutuhkan kalor
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Bagaimanakah bunyi dari hukum Hess?
Besar gaya tolak-menolak atau gaya tarik-menarik antara dua benda bermuatan listrik, berbanding lurus dengan besar masing-masing muatan listrik dan sebaliknya
Tekanan yang diberikan pada zat cair dalam ruang tertutup, diteruskan ke segala arah dengan sama besar
Jika resultan gaya pada suatu benda sama dengan nol, maka benda yang semula diam akan terus diam. Sementara, benda yang mula-mula bergerak akan terus bergerak dengan kecepatan tetap
Jumlah panas yang dibutuhkan atau dilepaskan pada suatu reaksi kimia tidak bergantung pada jalannya reaksi tetapi ditentukan keadaan awal dan akhir
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Pada kalorimeter dicampurkan 50 mL larutan HCl 1 M dan 50 mL larutan NaOH 1 M pada suhu 29 °C. Ternyata suhu campuran mencapai 35 °C. Berapa ∆H reaksi dari reaksi berikut?
HCl(aq) + NaOH(aq)→ NaCl(aq) + H2O(ℓ)
ΔH= 50,16 kJ/mol.
ΔH= -49,16 kJ/mol.
ΔH= -50,16 kJ/mol.
ΔH= -51,16 kJ/mol.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Perubahan entalpi pembakaran gas CH4 (Ar C = 12 dan H = 1) = -80 kJ/mol. Berapa kJ perubahan entalpi pembakaran 4 gram gas tersebut ?
-20 kJ
20 kJ
-30 kJ
-32 kJ
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