Polyatomic ions are often said to be a cross between covalent compounds and ionic compounds. what can they be characterized in such a way?

How to convert a density of 0.791g/cm3 to lb/ft3

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?