Final answer:
The sentence 'The sun is hot, so wear a hat.' is not a run-on sentence.
Step-by-step explanation:
The sentence 'The sun is hot, so wear a hat.' is not a run-on sentence. It consists of two independent clauses, but they are properly connected with a coordinating conjunction. A run-on sentence occurs when two or more independent clauses are joined without proper punctuation or coordinating conjunction. In the sentence 'The sun is hot wear a hat.' there is no punctuation or coordinating conjunction to connect the two independent clauses, making it a run-on sentence.
Learn more about Run-on sentences