3) Did you know water is the only substance on Earth where the solid form is less dense than its liquid form? Select the Water (HO) option at the top and click between the Solid and Liquid phases. Using what you observe, explain why the solid form of water (HO) is able to float in its liquid form.

Click between Solid, Liquid and Gas for each substance and pay careful attention to the "attraction" between molecules in each phase. For each state, rank which has the GREATEST to LEAST attraction between molecules.

(a) How does the average kinetic energy of molecules compare with the average energy of attraction between molecules in solids, liquids, and gases? (b) Why does increasing the temperature cause a solid substance to change in succession from a solid to a liquid to a gas? (c) What happens to a gas if you put it under extremely high pressure?

Ice floats on water. For most other substances however, the solid sinks in the liquid.Classify each of these statements as true for water, or true for most other substances. A)High pressure will cause the solid to become liquid. B)In a phase diagram, the solid-liquid coexistence line has a negative slope. C)The solid is more dense than the liquid. D) The molecules are closest in the solid phase. E) High pressure will cause the liquid to become solid F) The solid is less dense than the liquid G) The molecules are closest in the liquid phase H) In a phase diagram, the solid-liquid coexistence line has a positive slope

Ice floats on water. For most other substances however, the solidsinks in the liquid. Classify each of these statements as true forwater, or true for most other substances.

A) In a phase diagram the solid-liquid coexistance line has anegative slope.
B) In a phase diagram the solid-liquid coexistance line has apositive slope.
C) The solid is more dense than the liquid.
D) The solid is less dense than the liquid.
E) The molecules are closest in the solid phase.
F) The molecules are closest in the liquid phase.
G) High pressure will cause the solid to become liquid.
H) High pressure will cause the solid to become liquid.