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Chemistry

posted by on .

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

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

  • Chemistry - ,

    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

  • Chemistry - ,

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

  • Chemistry - ,

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

  • Chemistry - ,

    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.

  • Chemistry - ,

    Ahh ok I see. Thanks for the help!

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