You won't need it for electrochem or hess' law. You'll have to memorize logs for 1-9 for pKa questions.
You don't really need it for QR, but if you're low on energy by the time you start qr, it makes it so you don't have to do as much work in terms of calculations. Only +. -, * and /. I don't think it has any memory functions, sq root. Its also pretty slow and only registers mouse clicks (so no keyboard entries count)