I am going from JFK to ICN with a layover in Beijing Capital Airport.

All of my flights are operated by Air China and bought together. My questions include:
1) Since all of my flights are operated by Airchina that would allow me to skip the baggage pickup part, correct?
2) I am given 1 hr 50 min for the connecting flight. Would that be sufficient time?
3) Are all of airchina's flight terminals within approximate distance from one another in PEK?
4) If the first flight operated by Airchina is delayed, would they hold the connecting plane for their customers?

Thank you for your help in advance!!!!! Greatly appreciated !