A church is a building, usually large, where Christians come to worship, whereas a chapel is smaller and usually attached to the church by a breezeway or sits on the same grounds as the church. The chapel is more modest and traditionally used for small, quaint services like baptism and small weddings. There are chapels in other places where the size of the church would be too large, which would include schools, military installations, hospitals, and airports.
The word church is cited in the bible a few times; however, because the chapel was formed at a later time, it is not mentioned there. The formation of the chapel was for convenience's sake, where the church was occupied at a time when someone needed a place to pray.