Answer:
KF - ionic
NaCl - ionic
CO₂ - covalent
NH₄Br - covalent
CaSO₄ - ionic
Step-by-step explanation:
Ionic compounds are compounds that contain metals and and nonmetals. Covalent compounds are compounds that contain only nonmetals.
For example KF has potassium (metal) and fluorine (nonmetal). This makes it ionic. CO₂, on the other hand, has carbon and oxygen, which are both nonmetals. This makes it covalent.