Yes.
No, don't hypenate child at heart.
Depends on how you use the word. For example, you can use it if you are writing a hyphenated modifier: "She had that I'm-going-to-try-not- to-laugh-right-now face." But you can't hypenate the word when: "She had a terrible-laugh." ---> "She had a terrible laugh."
Yes, "editor-at-large" should be hyphenated.
Nope. It is not a word. my sources : the dictionary.
There are 2 sources of beauty in the modern word. These sources of beauty are outward appearance and inward personality.
Yes, "fourth-grade teacher" should be hyphenated in this context as it is acting as a compound modifier before the noun "teacher."
Two.
There is no way to hypenate the term all right. The term all right is spelled just as such, and it does not need any type of special puncutation or anything.
the answer for renewable is sources
Troubles
From the Spanish word for chestnuts. Sources: Wikipedia, Merriam-Webster