Question

1) Na + H2O = ? + H2
Na2SO4 + Ba(OH)2 = ? + ?
CuCl2 + Ca(Oh)2 = ? + ?
BaO + H2O = ?

2) Scrieti compozitia chimica a nisipului

Answer 1

1) 2Na + 2H2O => 2NaOH + H2

Na2SO4 + Ba(OH)2 => 2NaOH + BaSO4

CuCl2 + Ca(OH)2 => Cu(OH)2 + CaCl2

BaO + H2O => Ba(OH)2

2) Formula chimica nisip => SiO2

MSiO2 = ASi + 2AO = 28 + 2*16 = 60g/mol

mSi=28g    mO2=32g

%Si = mSI/M*100= Calculeaza !

% O = mO/M*100= Calculeaza !