The idiomatic phrase "have to" means "must" but may be shown as the slang term haveta.
The contraction (not a compound word) is doesn't.
The gaseous compound is "carbon dioxide."
Magnesium Sulfide
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The compound PbSO4 is lead sulfate, more specifically lead (II) sulfate.
The word is spelled basketball. It is a compound word.
That is the proper spelling of the compound word "frontiersman".
The correct spelling of the compound noun is roommate.
That is the correct spelling of the compound noun "spacesuit."
ALCOHOL - a chemical compound (or intoxicating beverages which contain it)
The likely word is "vitamin" (necessary metabolic compound).
The correct spelling is "ammonia" (the chemical compound NH3).