3 black wires and 3 white wires
The straight answer is the two whites together go to the white, or neutral, of the fixture. The single black goes to the black, or hot, of the fixture. Leave the other splice alone, just fold it back in the box. 

None of what you describe is a ground. If there is a bare or green wire anywhere that would be your ground. Also, under some circumstances the box itself, if metal, could be a valid ground, but this depends on a few things.