Styrofoam is the brand name of a product, like Xerox is the name of both a company and a service (Xerox copies). So Styrofoam has a first letter cap.
She used Styrofoam peanuts when packing the vase.
He didn't like Styrofoam peanuts because they do not degrade in landfills.
Yes!
You should capitalize it if it is a brand name.
No, you should not. You should only capitalize a word when it is at the start of a sentence or when it is a proper noun.
It should not be capitalized.
No
Yes you should capitalize the name of cities. You would capitalize it because it is a proper noun.
No. It's not necessary.
Styrofoam is not digestible. The body will eliminate it before it would be digestible. Styrofoam should not be consumed under any circumstances.
Yes, you should capitalize the C in Century.
You should capitalize it if it is a brand name.
No, you should not. You should only capitalize a word when it is at the start of a sentence or when it is a proper noun.
Yes, you should capitalize "The Rotunda" as it is a specific place or location.
You should capitalize Colosseum when referring to the specific ancient Roman amphitheater in Rome.
It should not be capitalized.
No
no
No
You should capitalize "Musical Theatre" when referencing the specific genre or art form.