an appositive is a noun that is placed after another noun in order to tell more about it and it's usually set off with commas. TRUE

Right.

Mr. Duskin, my favorite teacher, taught chemistry.

Yes, your statement is true. An appositive is indeed a noun or noun phrase that is placed after another noun in order to provide further information or clarification about it. Appositives are often set off with commas to help separate them from the rest of the sentence and indicate that they are providing extra details. The use of appositives can enhance the context and description of a sentence, making it clearer and more informative.