Understanding States of Matter and Phase Changes

Matter exists in different states, commonly solid, liquid, and gas. Changing from one state to another involves gaining or losing energy and is called a phase transition or phase change.

Analyzing the Given Options

Let's examine each option provided:

• Oxidization: This is a chemical process involving the loss of electrons or an increase in oxidation state, often reacting with oxygen. It is not a change of state from liquid to gas.
• Sublimation: This is a phase transition where a substance changes directly from a solid to a gas without passing through the liquid state. An example is dry ice (solid carbon dioxide) turning directly into gaseous carbon dioxide. This is not the conversion from liquid to gas.
• Evaporation: This is a type of vaporization where a liquid changes into a gas or vapor below its boiling point. It typically occurs at the surface of the liquid. The molecules gain enough energy to overcome the intermolecular forces holding them in the liquid state and escape into the surrounding environment as gas. This process fits the description of converting from a liquid state to a gaseous state.
• Condensation: This is the phase change from the gaseous state to the liquid state. An example is water vapor in the air cooling down and turning into liquid water droplets (like dew or clouds). This is the opposite of converting liquid to gas.

Identifying the Correct Conversion Process

The question asks for the conversion from a liquid state to a gaseous state. Based on the analysis of the options, Evaporation is the process where a substance transitions from the liquid phase to the gaseous phase, especially when occurring below the boiling point. The more general term for liquid to gas conversion at the boiling point is boiling, but evaporation is also a valid term describing this type of phase change.

Therefore, the process called conversion from a liquid state to a gaseous state is Evaporation.

Revision Table: Phase Changes

Additional Information on States of Matter

The state of matter depends on the temperature and pressure. The molecules in a solid are tightly packed in a fixed arrangement. In a liquid, molecules are still close but can move around. In a gas, molecules are far apart and move randomly at high speeds.

Energy input is required to change a substance from a solid to a liquid (melting) or from a liquid to a gas (evaporation/boiling). This energy helps molecules overcome the intermolecular forces holding them together.

Energy is released when a substance changes from a gas to a liquid (condensation) or from a liquid to a solid (freezing), as the molecules come closer together and form stronger bonds.

Oxidization is a chemical reaction, not a physical phase change, and involves changes in the chemical composition of a substance, whereas phase changes only alter the physical state.