Ice floats on water because

ice has a lower density than water.
water contracts when it freezes.
of the boiling point of water.
all of the above

1) clean up you lab area2) dispose of the chemicals as instructed by your teacher3) put everything back where it belongs unless your teacher tells you otherwise4) dispose of gloves5) wash hands with soap and water

The correct answer is "b"

Yes yes yes very good