Final answer:
SO2 is a covalent compound, CaF2 is an ionic compound, N2H4 is a covalent compound, Al2(SO4)3 is an ionic compound.
Step-by-step explanation:
Based on the information given, we can determine whether each compound is ionic or covalent by using the periodic table and the rules for bonding.
(a) SO2 is a covalent compound because it is formed between nonmetals (sulfur and oxygen).
(b) CaF2 is an ionic compound because it is formed between a metal (calcium) and a nonmetal (fluorine).
(c) N2H4 is a covalent compound because it is formed between nonmetals (nitrogen and hydrogen).
(d) Al2(SO4)3 is an ionic compound because it is formed between a metal (aluminum) and a polyatomic ion (sulfate).