Posted by Cierra on Wednesday, October 3, 2007 at 8:23pm.
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
Hmmm...I keep trying these answers, but it says it's wrong. I'm not sure why...
Oh I see, the answer to "compounds are molecules" was in fact "Sometimes." Not exactly sure why, though...
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.
Ahh ok I see. Thanks for the help!
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