-? .
1. Fe + 2HCl = FeCl2 + H2.
2. FeCl2 + 2NaOH = Fe(OH)2 + 2NaCl.
3. Ba(NO3)2 + K2SO4 = BaSO4 + 2KNO3.
4. 2KI + Cl2 = 2KCl + I2.
.
- , . , , . , .
, . , , , .
, . , , , .
.
1. + 2 Cl = Cl2 + 2.
. , -:
- 2 = , .
2 + 2 = 2 , .
2. 2 + 2 = 2 + 2 .
, -.
3. ( 3)2 + = 2 3 +
-, .
4. 2K + 2 = 2K + 2.
, - -- :
2 -2 = 2 , ,
2 + 2 = 2 , .