Answer:
B, C, D, F, I
Step-by-step explanation:
A covalent bond is a chemical bond between two nonmetals (their electronegativity difference must be greater than 1.5-1.6)
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A. Ca is a metal and O is nonmetal, so the bond in CaO is ionic
B. Both H and Cl are nonmetals, so the bond in HCl is covalent
C. Both C and O are nonmetals, so the bond in CO2 is covalent
D. Both S and O are nonmetals, so the bond in SO2 is covalent
E. Na is a metal and O is nonmetal, so the bond in Na2O is ionic
F. Both P and Cl are nonmetals, so the bond in PCl3 is covalent
G. Mg is a metal and O is nonmetal, so the bond in MgO is ionic
H. Na is a metal and H is nonmetal, so the bond in NaH is ionic
I. Both C and H are nonmetals, so the bond in CH2 is covalent