What state of water is characterized by molecules not being able to move freely?

• A. Liquid State
• B. Gas State
• C. Solid State
• D. None of the above

Answer: (C)

The solid state of water is characterized by molecules that are closely packed together and unable to move freely. In this state, the water molecules are held in a fixed position by intermolecular forces, resulting in a rigid structure. This arrangement allows solids to maintain a definite shape and volume.

In solids, the energy of the molecules is lower than in liquids and gases, which is why they vibrate in place rather than moving around freely. This is in contrast to the liquid and gas states, where the molecules can move more freely due to the weaker intermolecular forces. Understanding this distinction is crucial when studying the physical properties of substances and their phase transitions.