Final answer:
During condensation, molecules move closer together and their movement slows down due to lower kinetic energy and an increase in cohesive forces. This process changes the substance from a gaseous to a liquid state, increasing its density.
Step-by-step explanation:
During condensation, molecules are moving closer together. This is because condensation is the change from a gaseous to a liquid state, which involves the cohesive force, or the force of attraction between identical molecules. As gas molecules cool, they lose kinetic energy and move slower, thus allowing the cohesive force to draw them closer together, resulting in a denser liquid phase.
Condensation also affects the rate at which ice melts. When condensation occurs on the surface of a glass of ice water, it indicates a transfer of energy to the ice. This can slightly warm the ice, making it melt faster than it would if the glass was in a perfectly insulated system where no condensation could occur.
Furthermore, larger molecules move slower than lighter molecules, and increasing or decreasing temperature influences the energy within the medium, affecting molecular movement. Density is inversely proportional to molecular movement. Hence, as the molecules condense and density increases, their movement slows down.