Page 13 - UKBM KIMIA X Genap 2021
P. 13
KIM.3.9/4.9/2/1.1
a. Apabila reaksi 1 disebut reaksi OKSIDASI, dan reaksi 2 disebut reaksi REDUKSI, apa yang dapat
kalian simpulkan dari kedua reaksi tersebut?
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b. Berdasarkan hasil analisis pengamatan diatas, coba selesaikan soal berikut ini:
Isilah apakah termasuk reaksi oksidasi atau reduksi?
1) 2AgO(s) → 2Ag(s) + O2(g)
2) 2Hg(s) + O2(g) → 2HgO(s)
3) 2S(s) + 3O2(g) → 2SO3(g)
4) 2H2O(l) → 2H2 + O2
5) C(s) + O2(g) → CO2(g)
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2. Reaksi Redoks Berdasarkan Pengikatan dan Pelepasan Elektron
Perhatikan kembali reaksi kimia berikut!
a) 2K(s) + Br2(g) ⟶ 2KBr(s)
b) Ba(s) + Cl2(g) ⟶ BaCl2(s)
c) 2Ca(s) + O2(g) ⟶ 2CaO(s)
Reaksi tersebut dapat dipecah menjadi setengah reaksi, seperti yang terlihat pada tabel di bawah ini!
Reaksi 1 Reaksi 2
+
-
-
K ⟶ K + e - Br2 + 2e ⟶ 2Br
Ba ⟶ Ba + 2e - Cl2 + 2e ⟶ 2Cl
2+
-
-
2-
Ca ⟶ Ca + 2e - 2O2 + 4e ⟶ 2O
2+
-
a. Apabila reaksi 1 disebut reaksi OKSIDASI, dan reaksi 2 disebut reaksi REDUKSI, apa yang dapat
kalian simpulkan dari kedua reaksi tersebut?
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b. Tentukan apakah terjadi serah terima elektron dalam reaksi-reaksi berikut. Dengan kata lain,
apakah terjadi reaksi redoks atau tidak.
1) Mg(s) + Cl2(g) → MgCl2(aq)
2) Ca(s) + Cl2(g) → CaCl2(s)
3) 3Mg(s) + N2 → Mg3N2
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