
Latihan 4
Authored by Mal anul Aufiya
Chemistry
8th Grade
Used 1+ times

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30 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
Di antara senyawa oksida nitrogen berikut ini, yang mengandung 36,4% massa oksigen adalah...
NO
2.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
Rumus molekul suatu garam adalah XCl2. Ion X dalam garam ini mempunyai 27 elektron, maka logam X adalah...
Ni
Co
Fe
Zn
Cu
3.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
Larutan natrium sulfat dapat bereaksi dengan larutan barium klorida sesuai persamaan reaksi yang setara berikut:
Na2SO4(aq) + BaCl2(aq) → 2NaCl(aq) + BaSO4(s)
Seorang siswa mencampurkan larutan yang mengandung 10,0 g Na2SO4 dicampurkan dengan larutan yang mengandung 10,0 g BaCl2, dan diperoleh 12,0 g BaSO4. Persen hasil (rendemen) dari reaksi ini adalah...
60%
73,1%
82,4%
93,3%
>100%
4.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
Untuk mengoksidasi 25 gram cuplikan FeSO4 (Mr = 152), diperlukan 6,125 gram K2Cr2O7 (Mr = 294). Pada reaksi ini ion dikromat berubah menjadi Cr3+, sedangkan Fe2+ berubah menjadi Fe3+. Kadar FeSO4 dalam cuplikan di atas adalah
19%
76%
38%
48%
92%
5.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
Pehatikan persamaan termokimia berikut:
2H2(g) + 2Cl2(g) → 4HCl(g) ; ∆Ho = –92,4 kJ
Di antara pernyataan berikut yang tidak benar mengenai persamaan termokimia di atas adalah…
Bila persamaan tersebut dibalik nilai ∆Ho adalah +92,4 kJ
Empat ikatan HCl lebih kuat dibandingkan empat ikatan dalam H2 dan Cl2
Nilai ∆Ho adalah juga –92,4 kJ bila HCl yang dihasilkan berwujud cair
Nilai ∆Ho pembentukan gas HCl adalah 23,1 kJ/mol
Sebanyak 23,1 kJ kalor akan dilepaskan bila dihasilkan 1 mol gas HCl
6.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
Di antara larutan dalam air berikut ini yang mempunyai titik didih paling tinggi adalah…
1,0 m asam asetat, CH3COOH
1,0 m asam klorida, HCl
1,0 m asam sulfat, H2SO4
1,0 m asam fosfat, H3PO4
1,0 m glukosa, C6H12O6
7.
MULTIPLE CHOICE QUESTION
2 mins • 5 pts
Di antara larutan dalam air berikut:
i. 0,2 M HF
ii. 1,5 M CH3COONa
iii. 3,0 M NH4Br
iv. 0,5 M NH3
v. 0,85 M FeCl3
yang mempunyai pH di bawah 7,0 adalah...
i, iii, v
ii, iv
i, ii, iii
hanya i
tidak ada, semua bersifat basa
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