1.
____SiO2 + ____Mg →
2.
____HCl + ____Zn →
3.
____TiO2 + ____Al →
4.
____CH3COOH + ____Mg →
5.
____H2SO4 + ____Zn →
6.
____Al + ____CuSO4 →
7.
____Al + ____Hg(NO3)2 →
8.
____CuCl2 + ____Zn →
9.
____HI + ____Zn →
10.
____Ba + ____H2O →
11.
____Al + ____Pb(NO3)2 →
12.
____Sr + ____H2O →
13.
____HBr + ____Mg →
14.
____Fe + ____CuBr2 →
15.
____Mg + ____AgNO3 →
16.
____HCl + ____Al →
17.
____H2SO4 + ____Fe →
18.
____H2SO4 + ____Mg →
19.
____HBr + ____Zn →
20.
____Mg + ____Sn(NO3)2 →