Final answer:
In Chemistry, the phase diagram of water is used to determine the state of water at various pressure and temperature conditions. At 50 kPa and -10 °C, water exists as ice (solid), at 50 kPa and 50 °C it exists as a liquid, and at 25 kPa and 200 °C, as a gas (vapor). The molecular arrangement varies in each phase, with gas molecules being far apart and disorganized, while solid molecules are close and organized.
Step-by-step explanation:
The subject of this question is Chemistry, specifically the states of water and the transitions between them. Considering the phase diagram of water, we can determine the physical state of water under various temperature and pressure combinations.
For instance, at 50 kPa and -10 °C, water is in the solid form, known as ice. At 50 kPa and 50 °C, water is in its liquid state. However, at 25 kPa and 200 °C, water is in the form of a gas. The transitions between these states involve processes such as melting, freezing, condensation, and vaporization, which are integral to understanding the behavior of water in its various phases.
Modeling these phases with marbles or clay can provide a visualize representation of the molecular arrangements in each phase. For example, in the solid state (ice), the water molecules are close together and organized. In the liquid state, they are close together but disorganized, and in the gaseous state (vapor), they are far apart and disorganized.