Question

which statement indicates that a substance may be an ionic compound?
it has a low melting point.
it is made up of molecules.
it can be flattened by a force.
it is made up of a crystal lattice.

Explanation:

Ionic compounds are composed of ions arranged in a crystal lattice structure. They have high melting points (due to strong ionic bonds), are not made up of discrete molecules (but a continuous lattice of ions), and are brittle (not malleable like metals which can be flattened by force).

Answer:

It is made up of a crystal lattice.