Question

1. K + ? --> K2S
2. Fe3O4 + ? --> Al2O3 + Fe
3. Na + Cl2 + ? --> ?
4. Cu + AgNO3 + ? --> ? + Ag
5. NaOH + FeCl2 --> ? NaCl

Answer 1

2K+ S--to---> K2S

3Fe3O4+ 8Al------> 4Al2O3+ 9Fe

2Na+ Cl2-----> 2NaCl

NaOH+ FeCl2-----> Fe( OH)2+ NaCl

Answer 2

1. 2K + S -to-> K₂S

2. 3Fe₃O₄ + 8Al --> 4Al₂O₃ + 12Fe

3. 2Na + Cl₂ --to--> 2NaCl

4. Cu + 2AgNO₃ --> Cu(NO₃)₂ + 2Ag

5. 2NaOH + FeCl₂ --> 2NaCl + Fe(OH)₂

Answer 3

pt 2 sửa 9Fe nha, mk nhầm

Answer 4

1.S

2.AL

3.NaCl

4.CuNO2

5.Fe(OH)2

suong nhi , minh hoc vnen day nhu cc ay

Answer 5

2K + S → K₂S

3Fe₃O₄ + 8Al → 4Al₂O₃ + 9Fe

2Na + Cl₂ → 2NaCl

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

2NaOH + FeCl₂ → Fe(OH)₂ + 2NaCl

Answer 6

\(2K+S\rightarrow K2S\)

\(3Fe3O4+8Al\rightarrow4Al2O3+9Fe\)

\(2Na+Cl2\rightarrow2NaCl\)

\(Cu+2AgNO3\rightarrow Cu\left(NO3\right)2+2Ag\)

\(2NaOH+FeCl2\rightarrow2NaCl+Fe\left(OH\right)2\)