I'm going to tell my friend in chem class to pay more attention
Why isn't your friend paying attention in class?
He never listens and is always daydreaming.
It's good that you want to help your friend pay attention in chem class, because if he doesn't then he'll probably do poorly in the class. Helping your friends in school is a really kind thing to do.
I don't think it is a big deal.
It could be a big deal, failing a class is pretty bad. Just make sure you don't fall behind yourself you need to prioritize you first.