The difference between a molecule and a compound is that a compound is made up of atom from

answer explained below.

Explanation:

hey! a molecule is made up of two or more atoms, and a compound is made up of two or more elements. not all molecules are compounds, but all compounds are molecules, because compounds are made up of different atoms.

example: O2 is a molecule but not a compound because it is made up of the same element, but has more than one atom.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)