Răspuns:
Ca(OH)₂ + 2HCl -> CaCl₂ + 2H₂O
Ca(OH)₂: hidroxid de calciu- baza, HCL: acid clorhidric- acid, CaCl₂: clorura de calciu- sare, H₂O- apa - oxid
CaCO₃ -> CaO + CO₂
CaCO₃- carbonat de calciu- sare, CaO- oxid de calciu, oxid, CO₂- dioxid de carbon, oxid
4Al+3O₂ -> 2Al₂O₃
Al- aluminiu, metal, O₂- oxigen, gaz, Al₂O₃- oxid de aluminiu- oxid
Fe₂O₃+2Al -> Al₂O₃ + 2Fe↓
Fe₂O₃- oxid de fier(III), oxid feric - oxid, Al- metal, aluminiu, Fe- metal, fier...
112 g x g
6. CaO+ H₂O => Ca(OH)₂
56 g 74 g
μ CaO= A Ca+ A O= 40+16= 56 g.mol
μ Ca(OH)₂= A Ca+ 2*A O + 2*A H= 40+32+2=74 g/mol
x= 112*74/56= 128 g Ca(OH)₂
7. c= (md/ms)*100 => ms= md*100/c
ms= 5500 *100/60= 9166,67 g
m H₂O= ms-md= (9166,67 -5500)g= 3666,67 g
