Can someone check these answers for me? I know some if not all are wrong, but I don't know which ones they are.

Question

-Substances are elements or compounds.
Sometimes
-Elements exist as molecules.
Never
-Compounds are molecules.
Sometimes
-Mercury is an element.
Always
-Ions possess charges.
Always

Answer 1

Substances are elements or compounds.
Sometimes yes, but always

-Elements exist as molecules.
Never sometimes. P₄ and S₈ are examples of two.

-Compounds are molecules.
Sometimes always

-Mercury is an element.
Always OK

-Ions possess charges.
Always OK

Answer 2

Hmmm...I keep trying these answers, but it says it's wrong. I'm not sure why...

Answer 3

Oh I see, the answer to "compounds are molecules" was in fact "Sometimes." Not exactly sure why, though...

Answer 4

The difference may be semantic. Compounds ALWAYS CONSIST of molecules but you may only SOMETIMES have a single molecule of a compound.
That may be the problem.

Answer 5

Ahh ok I see. Thanks for the help!