Question

question 14 of 20
ice floats on water. for most other substances, however, the solid sinks in the liquid.
classify each of these statements based on whether they describe water or most other substances.
water
most other substances
high pressure will cause the liquid to become solid.
the solid is less dense than the liquid.
the molecules are closest in the solid phase.
in a phase diagram, the solid - liquid coexistence line has a positive slope.
answer bank
the molecules are closest in the liquid phase.
the solid is more dense than the liquid.
high pressure will cause the solid to become liquid.
in a phase diagram, the solid - liquid coexistence line has a negative slope.

Explanation:

Water has the unique property that its solid form (ice) is less dense than its liquid form, which is why ice floats. For most substances, the solid is more dense than the liquid, and the molecules are closest in the solid phase. High - pressure causes the liquid to become solid for most substances, while for water high - pressure can cause the solid (ice) to become liquid. In a phase diagram, the solid - liquid coexistence line has a negative slope for water and a positive slope for most substances.

Answer:

Water:

• The solid is less dense than the liquid.
• The molecules are closest in the liquid phase.
• High pressure will cause the solid to become liquid.
• In a phase diagram, the solid - liquid coexistence line has a negative slope.

Most other substances:

• High pressure will cause the liquid to become solid.
• The molecules are closest in the solid phase.
• The solid is more dense than the liquid.
• In a phase diagram, the solid - liquid coexistence line has a positive slope.