
Posttest
Authored by Edy Suhendra
Science
10th Grade

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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Koefisien dalam persamaan reaksi menunjukan ….
Jumlah molekul zat dalam reaksi
Perbandingan berat zat dalam reaksi
Jumlah volume zat dalam reaksi
Jumlah atom zat dalam reaksi
Perbandingan mol zat dalam reaksi
2.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Ba(OH)2(aq) + H2SO4(aq) → BaSO4(aq) + H2O(l) zat yang merupakan hasil reaksi persamaan reaksi di atas adalah ….
Ba(OH)2(aq) dan H2SO4(aq)
Ba(OH)2(aq) dan BaSO4(aq)
BaSO4(aq) dan H2O(l)
H2SO4(aq) dan BaSO4(aq)
H2SO4(aq) dan H2O(l)
3.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Diantara persamaan berikut yang belum setara adalah ….
Mg + 2HCl → MgCl2 + H2
CaCO3 + 2 HCl → CaCl + CO2 + H2O
Fe2O3 + 3 CO → 2Fe + 3 CO2
2 Na + 2 H2O → 2 NaOH + H2
2 Al + 6 HCl → 2 AlCl3 + 3H2
4.
MULTIPLE CHOICE QUESTION
2 mins • 2 pts
Pada reaksi aFe + bO2 → cFe2O3 agar persamaannya setara maka harga a, b, dan c yaitu ….
1, 2, 3
2, 2, 3
2, 3, 2
4, 2, 2
4, 3, 2
5.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Karbit (kalsium karbida) yang mempunyai padatan putih pada umumnya digunakan orang mengelas. Karbit dihasilkan dari pemanasan kalsium oksida dan karbon dioksida dalam tanur listrik dengan hasil samping gas karbon dioksida. Persamaan reaksi yang terjadi adalah ….
Ca (s) + 2 C(s) → CaC2 (s)
CaO(s) + 2 C(s) → CaC2 (s)
2 CaO(s) + 5 C(s) → CaC2 (s) + CO (g)
CaC2 (s) + H2O(l) → C2H2 (g) + CaO (s)
C2H2 (g) → 2 C (s) + H2 (g)
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