
ASTS XI
Quiz
•
Chemistry
•
11th Grade
•
Practice Problem
•
Easy
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Suatu senyawa memiliki rumus empiris CH2. Bentuk fisik senyawa ini adalah cairan tak berwarna dengan bau seperti bensin. Jika massa molekul relatif senyawa tersebut 70, maka rumus molekulnya adalah ....
C2H4
C3H6
C4H8
C5H10
C6H12
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Freon AC mobil merupakan salah satu komponen pada mobil yang memiliki wujud senyawa kimia dan berfungsi untuk menyerap panas dari udara. Pada suatu percobaan, terdapat sampel freon yang terdiri dari 1,2 gr C, 7,0 gr Cl, dan 1,8 gr F. Rumus empiris freon tersebut adalah …. (Ar F = 9, C = 12, dan Cl = 35,5)
CCl2F2
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Dalam 100 gram senyawa terdapat 40% kalsium, 12% karbon, dan 48% oksigen. Jika Ar Ca = 40, C = 12, dan O = 16, maka rumus empiris senyawa tersebut adalah ....
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Diantara senyawa-senyawa berikut:
(I) (COOH)2
(II) NH3
(III) CH2O
(IV) N2H4
(V) C6H12O6
Yang merupakan rumus empiris dan rumus molekul berturut-turut adalah....
(I) dan (II)
(I) dan (IV)
(II) dan (III)
(II) dan (IV)
(III) dan (V)
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Sebanyak 172 gram Kristal kalsium sulfat CaSO4.xH2O dipanaskan sehingga terbentuk 136 gram Kristal CaSO4 menurut reaksi : CaSO4.xH2O (s) --> CaSO4(s) + x H2O (g)
Rumus senyawa dalam Kristal kalsium sulfat tersebut adalah ….
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
28 gram besi (Ar Fe = 56) direaksikan dengan 20 gram belerang ( Ar S = 32) sesuai dengan persamaan : Fe + S → FeS. Zat yang tersisa setelah reaksi selesai adalah ….
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
5 mol NH3 dan 6 mol O2 direaksikan sesuai dengan persamaan reaksi :
4 NH3 + 5 O2 → 4 NO + 6 H2O
Pernyataan yang benar mengenai reaksi tersebut adalah ….
Sisa 2,5 mol O2
Terbentuk 4 mol H2O
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