Question 4
Which statement about ice and water is correct?
The right answer is the one marked above.
Ice is less dense than water, so it floats. When water freezes, the intermolecular attractions hold the molecules in an open arrangement that occupies more space than the liquid.
If ice were denser it would sink, and ponds would freeze from the bottom up. The two cannot have the same density, or ice would neither float nor sink. Ice is a solid with a very regular arrangement.