
Evaluasi Termokimia
Authored by My Chemist
11th Grade
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Perhatikan rekasi yang terjadi dalam kehidupan sehari hari berikut ini:
1. Pelarutan urea
2. Es mencair
3. Fotosintesis
4. Perkaratan
5. Pembakaran LPG
Reaksi endoterm ditunjukkan oleh nomor. . . .
1, 2 dan 3
1, 3 dan 4
2, 3 dan 4
2, 4 dan 5
3, 4 dan 5
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Persamaan reksi berikut yang bersifat endoterm adalah . . . . .
KOH(aq) + HCl(aq) → KCl(aq) + 2H2O(l)
2CO(g) + O2(g) → 2CO2(g)
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
H2O(l) → H2O(g)
NaOH(s) → NaOH(aq)
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Persamaan termokimia yang menunjukkan entalpi pembentukan standar adalah . . .. .
Ba2+(aq) + 2Cl-(aq) → BaCl2(aq) ΔH = - 788 kJ
2SO2(g) + O2(g) → 2SO3(g) ΔH = - 196,6 kJ
NH3(g) + HCl(g) → NH4Cl(g) ΔH = - 175,9 kJ
Ca2+(aq) + 2NO3(aq) → Ca(NO3)2(s) ΔH = - 1.027 kJ
½ H2(g) + ½ N2(g) + 3/2 O2(g) → HNO2(aq) ΔH = - 278 kJ
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Perhatikan persamaan termokimia berikut.
Reaksi 1
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) ΔH = -1.543 kJ
Reaksi 2
NH4Cl(s) + NaOH(aq) → NH3(g)+NaCl(aq) + H2O(l) ΔH= +234 kJ
Pernyataan yang benar mengenai data tersebut adalah . . . .
Reaksi 1, system menyerap energy sehingga termasuk reaksi eksoterm
Reaksi 1, system menyerap energy sehingga termasuk reaksi endoterm
Reaksi 2, system menyerap energy sehingga termasuk reaksi endoterm
Reaksi 2, system melepaskan energy sehingga termasuk rekasi eksoterm
Reaksi 2, system melepaskan energy sehingga termasuk rekasi endoterm
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Diketahui diagram energy suatu reaksi sebagai berikut:
Berdasarkan diagram tersebut, dapat disimpulkan bahwa . . . . .
Reaksi bersifat endoterm
Entalpi pereaksi lebih kecil daripada entalpi hasil reaksi
Terjadi pelepasan kalor dari system ke lingkungan
Contoh reaksi tersebut adalah rekasi fotosintesis
Reaksi berlangsung pada suhu tetap
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Diketahui persamaan termokimia berikut:
C(s) + 2 H2(g) + ½ O2(g) → CH3OH(l) ΔH = -278 kJ
Perubahan entalpi pembakaran 1,6 gram methanol adalah . . . . .(Ar C = 12, H = 1, O =16)
– 139 kJ
– 13,9 kJ
– 1,39 kJ
+ 1,39 kJ
+ 13,9 kJ
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Perhatikan persamaan reaksi berikut:
2Fe2O3(s) → 4 Fe(s) + 3O2(g) ΔH = + 3.500 kJ
Entalpi reaksi pembakaran 16,8 gram besi (Ar Fe = 56) adalah . . . . .
– 1.050 kJ
– 525,0 kJ
– 262,5 kJ
+ 525,0 kJ
+ 1.050 kJ
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