Question

Stabiliti coeficientii următoarelor ecuatii ale reactiilor chimice:
Cu + O2 -> CuO Ba + O2 -> BaO
Fe + O2 -> Fe2 O3 cmmc 2x3=6
Na + H2O = NaOH + H2 par/impar - par/par FeCl3 + NaOH ->NaCl + Fe(OH)3
Mg+HCl ->MgCl2 +H2 Fe + S -> Fe2S3
Ca + AgNO3 -> Ca(NO3)2 + 2 Ag Al + HCl -> AlCl3 + H2
N2 + H2 -> NH3
H2SO4 + NaOH -> Na2SO4 + H2O

Answer 1

Răspuns:

2Cu + O2 -> 2CuO

2Ba + O2 -> 2BaO

2Fe + 3O2 -> Fe2O3

2Na + 2H2O = 2NaOH + H2

FeCl3 + 3NaOH ->3NaCl + Fe(OH)3

Mg+2HCl ->MgCl2 +H2

2Fe + 3S -> Fe2S3

Ca + 2AgNO3 -> Ca(NO3)2 + 2 Ag

2Al + 6HCl -> 2AlCl3 + 3H2

N2 +3 H2 -> 2NH3

H2SO4 + 2NaOH -> Na2SO4 + 2H2O.