Balance these scientific equations:
2 Al + Fe2O3 -> 2 Fe + Al2O3
2Ag+S -> Ag2S
CaCO -> CaO + CO2

the first and second one are both already balanced but the third one is

Caco3->Cao+Co2

hope this

explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)