Bài 6: Chọn hệ số thích hợp để cân bằng các phản ứng sau:
1/ Na + O2 Na2O 2/ P + O2 P2O5 3/ Zn + Cl2 ZnCl2 4/ Al + S Al2S3 5/ KClO3 KCl + O2 6/ KNO3 KNO2 + O2 7/ Al(0H)3 Al203 + H20 8/ H2 + Fe2O3 Fe + H2O 9/ CO + Fe2O3 Fe + CO2 10/ H2 + CuO Cu + H2O |
| 11/ Al + HCl AlCl3 + H2 12/ Zn + HCl ZnCl2 + H2 13/ Al + H2S04 Al2(S04)3 + H2 14/ FeO + HCl FeCl2 + H20 15/ Na20 + H20 Na0H 16/ N205 + H20 HN03 17/ Ca(OH)2 + FeCl3 CaCl2 + Fe(OH)3 18/ CuCl2 + AgN03 Cu(N03)2 + AgCl 19/ Na0H + FeS04 Na2S04 + Fe(OH)2 20/ BaCl2 + H2S04 BaS04 + HCl |
\(1.4Na+O_2\rightarrow2Na_2O\)
\(2.4P+5O_2\rightarrow2P_2O_5\)
\(3.Zn+Cl_2\rightarrow ZnCl_2\)
\(4.2Al+3S\rightarrow Al_2S_3\)
\(5.2KClO_3\rightarrow2KCl+3O_2\)
\(6.2KNO_3\rightarrow2KNO_2+O_2\)
\(7.2Al\left(OH\right)_3\rightarrow Al_2O_3+3H_2O\)
\(8.3H_2+Fe_2O_3\rightarrow2Fe+3H_2O\)
\(9.3CO+Fe_2O_3\rightarrow2Fe+3CO_2\)
\(10.H_2+CuO\rightarrow Cu+H_2O\)
\(11.2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(12.Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(13.2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(14.FeO+2HCl\rightarrow FeCl_2+H_2O\)
\(15.Na_2O+H_2O\rightarrow2NaOH\)
\(16.N_2O_5+H_2O\rightarrow2HNO_3\)
\(17.3Ca\left(OH\right)_2+2FeCl_3\rightarrow3CaCl_2+2Fe\left(OH\right)_3\)
\(18.CuCl_2+2AgNO_3\rightarrow Cu\left(NO_3\right)_2+2AgCl\)
\(19.2NaOH+FeSO_4\rightarrow Na_2SO_4+Fe\left(OH\right)_2\)
\(20.BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl\)