
Kuis Kimia 4
Authored by Ir S
Chemistry
12th Grade
Used 1+ times

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5 questions
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1.
MULTIPLE CHOICE QUESTION
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.....
0,5 gram
1 gram
2,5 gram
3 gram
4 gram
2.
MULTIPLE CHOICE QUESTION
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.....
7,5 gram
10 gram
12,5 gram
15 gram
20 gram
3.
MULTIPLE CHOICE QUESTION
3 mins • 10 pts
Suatu radioisotop X, mempunyai waktu paruh 15 hari. Setelah disimpan selama 60 hari, maka berat radioisotop tersebut akan tersisa sebanyak.....
50%
25%
12,5%
6,25%
3,125%
4.
MULTIPLE CHOICE QUESTION
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.....
4 liter
6 liter
8 liter
10 liter
12 liter
5.
MULTIPLE CHOICE QUESTION
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.....
20 hari
24 hari
26 hari
28 hari
30 hari
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