Final answer:
To represent water molecules in a liquid phase, arrange marbles or clay to suggest the water molecules are close but not rigidly fixed, allowing for mobility. Solid water molecules are closely packed in a lattice and gases far apart, with phase changes involving energy alteration.
Step-by-step explanation:
To illustrate a liquid made of water molecules like water liquid, one can use marbles or clay to represent the molecules. The arrangement for water in its liquid phase should show that the water molecules are close together but not in a rigid structure; they should be touching but also arranged in a way that suggests they can move past each other. This represents the fluidity of liquids, as they conform to the shape of their container but have a fixed volume.
In the solid phase, such as ice, the molecules would be in a fixed, lattice arrangement, closely packed and unable to move freely. For the gaseous phase, like steam, the molecules would be spread out with much more space between them, indicating their free movement and ability to expand to fill their container. The transition between these phases, or phase changes, such as melting, freezing, and evaporation, involves changes in energy and molecular movement.