Final answer:
A liquid that turns into a gas via heating is called volatile (3). Volatility is indicative of a substance's ability to vaporize easily. Viscous liquids, solids, and gases have distinct properties and are related to how substances change phases under different conditions.
Step-by-step explanation:
A liquid that is converted to a gaseous state through a heating process is described as being volatile. The volatility of a substance is a measure of how readily a substance vaporizes; that is, how easily it transitions from the liquid phase to the gas phase. A volatile liquid will have relatively weak intermolecular forces, allowing the molecules to separate and transition to a gas at lower temperatures.
By contrast, a viscous liquid has a high resistance to flow and does not necessarily vaporize easily. As for the states of matter, a solid maintains a fixed shape and volume, a liquid takes the shape of its container with a fixed volume, and a gas expands to fill its container and has no fixed volume.