Question

VA ROG AJUTOR URGENT DAU COROANA PLEASE
EX:13.10.Completiaza spatiile libere,stabilind coeficientii pentru urmatoarele ecuatii chimice:
a)Na=?-->NaBr; d) Al+Cl2-->?;
b)H2+?-->H2S3; e)Ca+F2-->?;
c)Al+?-->Al2S3; f)H2+Cl2-->?;
EX13.11.Termina ecuatiile reactiilor,indicind tipul ei:
a)Na+H2SO4-->
b)NaOH+H2SO4-->
c)CaO+HCl-->
d)CuO+HCl-->
e)Cu(OH)2+HCl-->
f)Al2O3+HNO3-->

Answer 1

a) presupund ca acolo ar fi trebuit sa fie + 
Na+Br-->NaBr
b)H2+S--H2S
c)2Al+3S-->Al2S3
d)6Al+3Cl2-->2Al2Cl3
e)2Ca+F2-->2CaF
f)H2+Cl2-->2HCl