This city shall be given into the hand of the Chaldeans: For the use of the passive, see verse 3.
Chaldeans; that is, Babylonians.
As elsewhere, their hand refers to their power. See verse 3.
Quoted with permission from Newman, Barclay M. and Stine, Philip C. A Handbook on Jeremiah. (UBS Helps for Translators). New York: UBS, 2003. For this and other handbooks for translators see here .