Good Morning,
This is from a CPO Physical Science textbook. This same symbol occurs 5 times that I have noticed so far in this chapter assessment but I did not see the same symbol used within the lesson itself which does lead me to believe it could be a misprint. In fact, a few of these symbols do seem like they should be reaction arrows. I will use a composite symbol in order to follow print and add a transcriber’s note. Thanks for your help!