flight from HK to Toronto via Beijing - do I need to claim lugguge & check them in again at Beijing?

flight details: dep HK 07:45 - HK Airlines HX336; Arr BJ 10:35 then dep BJ 13:55 - Hainan Airlines HU7975 (time between flights : 3:20)
questions: 1) both arrival & departure at the same terminal 2? 2) In case flight delay from HK, not enough time to get to HU7975, how and where I can seek help? I should not need to pay extra for another flight to Toronto as the flight delay is not my fault, right?