Yes, "site-specific" is hyphenated. The hyphen is used to connect the words "site" and "specific" to indicate that they function together as a single adjective describing a noun, such as in "site-specific art." This helps clarify that the specificity pertains to a particular site.
It is not hyphenated.
Motorcycle is not hyphenated
No it's not hyphenated.
words are only hyphenated when they have a separate meaning when separated than they do when hyphenated
Yes it should be hyphenated.
No, "hardworking" is not hyphenated.
It can be. Some words can be seen both hyphenated and non-hyphenated.
No. Well above is not hyphenated.
peace of mind is not hyphenated.
No, "homework" shouldn't be hyphenated.
Yes it should be hyphenated.
No they shouldn't be hyphenated.