Final answer:
The word 'and' in the sentence is a conjunction.
Step-by-step explanation:
The word 'and' in the sentence is classified as a conjunction. A conjunction is a part of speech that connects words, phrases, or clauses. In this case, 'and' connects the words 'homework' and 'projects', indicating that both are given to the students every Friday of the school year.
Learn more about parts of speech