Kuis Kimia 4

Assessment
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Ir S
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Chemistry
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12th Grade
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1 plays
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Medium
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5 questions
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1.
MULTIPLE CHOICE
3 mins • 10 pts
Suatu unsur radioaktif mempunyai waktu paruh 20 hari. Jika mula-mula unsur radioaktif tersebut terdapat sebanyak 32 gram, maka banyaknya unsur tersebut yang tersisa setelah meluruh selama 60 hari adalah.....
2.
MULTIPLE CHOICE
3 mins • 10 pts
Sebanyak 2 gram metana (Mr = 16) dibakar sempurna dengan O2 murni. Gas CO2 yang terbentuk dialirkan ke dalam larutan air kapur, Ca(OH)2, sehingga terbentuk endapan CaCO3 (Mr = 100). Berat endapan yang dibentuk.....
3.
MULTIPLE CHOICE
3 mins • 10 pts
Suatu radioisotop X, mempunyai waktu paruh 15 hari. Setelah disimpan selama 60 hari, maka berat radioisotop tersebut akan tersisa sebanyak.....
4.
MULTIPLE CHOICE
3 mins • 10 pts
Sebanyak 4 liter gas etana dibakar sempurna dengan gas oksigen.
2C2H6 (g) + 7O2 (g) à 4CO2 (g) + 6H2O (g)
Pada suhu dan tekanan yang sama didapatkan perbandingan koefisien C2H6 : O2 : CO2 : H2O berturut-turut adalah 2 : 7 : 4 : 6. Berapa volume gas CO2 yang terbentuk.....
5.
MULTIPLE CHOICE
3 mins • 10 pts
Dari penimbangan thorium 234 ternyata massanya 1,28 mg. Jika 48 hari kemudian penimbangannya menghasilkan thorium 0,32 mg, maka waktu paruh thorium tersebut adalah.....
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