Can you tell a molecular substance is molecular by its color?

A substance made up of molecules as its basic building blocks.

Decomposition

Boron trichloride

In most cases, a bond between two nonmetals will be covalent (indicating a molecule) while a bond between a metal and a nonmetal will be ionic. for example CO, carbon monoxide, is molecular.

There is no easy answer to this question. First, it depends what information you have to start with. Do you have the name? Do you know what elements are found in the substance? If you are given the...