A mug of boiling-hot water sits next to a glass of ice water. A. What happens to the water in each cup?
B. How does the movement of water molecules change in each case?
30 points

a) water molecules move rapidly in the mug of boiling water while they move slowly in the ice water. In the ice itself, the molecules stay in place.

b) Water must release energy to move from a higher to lower energy phase, i.e., from gas (water) vapor to liquid during condensation and from liquid to solid (ice) during freezing. In each case, the energy released by the water results in a change in the internal molecular bonding structure.

Explanation:

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.