ULANGAN HARIAN THERMOKIMIA

Quiz
•
Chemistry
•
11th Grade
•
Easy
Rajamuddin Sidabalok
Used 1+ times
FREE Resource
8 questions
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1.
OPEN ENDED QUESTION
5 mins • 10 pts
Suatu sistem menyerap kalor sebanyak 100 kJ dan melakukan kerja sebanyak 5 kJ. Tentukanlah perubahan energi dalam sistem tersebut ?
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2.
OPEN ENDED QUESTION
5 mins • 10 pts
Alegro melarutkan 4 gram serbuk NaOH ( Mr. NaOH = 40 gram / mol) ke dalam beaker yang berisi 500 mL air. Setelah semua serbuk NaOH larut, gelas beaker terasa panas dengan perubahan suhu sistem naik dari 25ο C sampai 30ο C. Tentukanlah perubahan enthalpi pelarutan NaOH tersebut ?
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3.
OPEN ENDED QUESTION
5 mins • 10 pts
Jelaskan secara singkat bahwa sistem dalam keadaan :
a. sistem terbuka
b. sistem dalam keadaan tertutup
c. sistem dalam keadaan terisolasi.
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4.
OPEN ENDED QUESTION
5 mins • 10 pts
Persamaan reaksi pembakaran gas etana sebagai berikut :
C3H8 (g) + 3O2 (g) --> 2CO2 (g) + 2H2O (l) ΔH = -84,5 kJ
Jelaskanlah pernyataan reaksi di atas dengan singkat !
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5.
OPEN ENDED QUESTION
5 mins • 10 pts
Sebutkan dan jelaskanlah beberapa peristiwa dalam kehidupan sehari-hari yang termasuk:
a. Reaksi endoterm
b. Reaksi exoterm
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6.
OPEN ENDED QUESTION
5 mins • 10 pts
Di dalam kalorimeter terdapat zat yang bereaksi secara endoterm. Reaksi tersebut menyebabkan 1 kg air yang terdapat dalam kalorimeter mengalami penurunan suhu 5ο C. Tentukanlah kalor reaksi dari reaksi tersebut ( kalor jenis air = 4,18 J/K.g )
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7.
OPEN ENDED QUESTION
5 mins • 10 pts
Pembakaran sempurna gas propana C3H8 ( Mr. = 44 gram/mol ) dapat menaikkan suhu 2 liter air. Jika ρ air = 1 gram/mL dan c air = 4,2 J/gr.οC, dari 27οC menjadi 75οC. JIka perubahan enthalpi pembakaran gas metana sebesar -806,4 kJ, tentukanlah massa gas propana yang dibakar ?
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8.
OPEN ENDED QUESTION
10 mins • 10 pts
Dalam suatu kalorimeter direaksikan 100 cm3 larutan HCl 1 M dengan 100 cm3 larutan NaOH 1 M, ternyata suhu naik dari 25ο C menjadi 32ο C. Kalor jenis larutan dianggap sama dengan kalor jenis air yaitu 4,2 J-1 gο C-1 dan massa jenis larutan dianggap 1 gram/cm3 . Tentukanlah perubahan enthalpi dari reaksi penetralannya ?
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