1.
____H2 + ____Mg →
2.
____HCl + ____Zn →
3.
____H2 + ____Ca →
4.
____H3PO4 + ____Li →
5.
____H2 + ____SnO2 →
6.
____CH3COOH + ____Mg →
7.
____Zn + ____H2O →
8.
____Al + ____H2O →
9.
____K + ____H2O →
10.
____Li + ____H2O →
11.
____H2 + ____O2 →
12.
____H2 + ____CuO →
13.
____H2 + ____N2 →
14.
____HCl + ____Na →
15.
____H2SO4 + ____Mg →
16.
____H2SO4 + ____Zn →
17.
____Ba + ____H2O →
18.
____H2 + ____Fe2O3 →
19.
____H3PO4 + ____Zn →
20.
____H2 + ____Ba →