Question

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) In a phase diagram the solid-liquid coexistance line has a negative slope.B) In a phase diagram the solid-liquid coexistance line has a positive 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.

Answer 1

Answer:

See explanation below

Explanation:

Water has the anomality of having the solid less dense than the liquid state. The reason for this is that  the hydrogen bonds in the solid ice forces the molecule to occupy more room to properly have the stability afforded by the hydrogen bonds. That is the reason why ice floats on water.

The other interesting consequence of this anomality is that the slope of the solid/liquid phase boundary is negative since at higher pressures the ice can be changed to its liquid phase which can be seen from the negative slope of the solid/liquid boundary.

A) True

B) False

C) False

D) True

E) False

F) True close up to 4 ºC when the water molecules start to behave like other liquids, that is the density of the liquid decreases.

G) True

H)  True ( repeated question)