Question

1. based on question #8, why is this the phase with the greatest density? 10. when water freezes, what happens to its volume? 11. when water freezes, what happens to its density?

Explanation:

For question 9, density is mass per volume. A phase with closely - packed particles has less volume for the same mass, thus higher density. For question 10, when water freezes, its volume increases due to the open - lattice structure of ice. For question 11, since density = mass/volume and mass is constant while volume increases when water freezes, the density of water decreases when it freezes.

Answer:

1. Because it has closely - packed particles reducing volume for the same mass.
2. Its volume increases.
3. Its density decreases.