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# Why is a phase change of gas to liquid considered exothermic?

## Why is a phase change of gas to liquid considered exothermic?

On the other hand, moving from gas to liquid to solid requires the opposite: Heat must be released. These phase changes are called exothermic reactions. The release of energy is felt as heat as the water vapor goes to water.

## What is the phase change when I go gas to liquid?

Condensation (Gas → Liquid) Condensation, the opposite of evaporation, is the change in the state of matter from the gas phase to the liquid phase.

What phase changes are exothermic and endothermic?

Phases and Phase Transitions

Phase Transition Change of Enthalpy
Vaporization (liquid to gas) ΔH > 0; enthalpy increases (endothermic process)
Sublimation (solid to gas) ΔH > 0; enthalpy increases (endothermic process)
Freezing (liquid to solid) ΔH < 0; enthalpy decreases (exothermic process)

Is gas to gas endothermic or exothermic?

Phases and Phase Transitions

Phase Transition Direction of ΔH
Freezing (liquid to solid) ΔH<0; enthalpy decreases (exothermic process)
Condensation (gas to liquid) ΔH<0; enthalpy decreases (exothermic process)
Deposition (gas to solid) ΔH<0; enthalpy decreases (exothermic process)

### What happens when gas changes to liquid?

If a gas is cooled, its particles will eventually stop moving about so fast and form a liquid. This is called condensation and occurs at the same temperature as boiling. Hence, the boiling point and condensation point of a substance are the same temperature.

### Is gas to liquid endothermic?

The phase transition from a gas to a liquid is an exothermic process.

What occurs when a liquid turns to a gas?

Evaporation occurs when particles in a liquid pass directly into the gas state, at a temperature below the boiling point of the liquid. Evaporation is dependent on individual particles gaining enough energy to escape the surface of the liquid and become gas particles.

Is gas to solid exothermic or endothermic?

Thus any transition from a more ordered to a less ordered state (solid to liquid, liquid to gas, or solid to gas) requires an input of energy; it is endothermic. Conversely, any transition from a less ordered to a more ordered state (liquid to solid, gas to liquid, or gas to solid) releases energy; it is exothermic.

## Is the process endothermic or exothermic?

At constant pressure, q is equal to the change in enthalpy (ΔH) for a process. If ΔH is positive, the process absorbs heat from the surroundings and is said to be endothermic. If ΔH is negative, the process releases heat to the surroundings and is said to be exothermic.

## Is melting a phase change endothermic or exothermic?

Answer and Explanation: Melting, sublimation and boiling are all phase changes which are endothermic. Is changing from a liquid to a gas exothermic? Thus any transition from a more ordered to a less ordered state (solid to liquid, liquid to gas, or solid to gas) requires an input of energy; it is endothermic.

Is changing from a liquid to a gas endothermic or exothermic?

Is changing from a liquid to a gas exothermic? Thus any transition from a more ordered to a less ordered state (solid to liquid, liquid to gas, or solid to gas) requires an input of energy; it is endothermic.

What is the difference between endothermic and exothermic reactions?

This means that as you move from solid to liquid to gas, all accompanying phase changes require the input of heat. Thus, these phase changes are an example of an endothermic reaction. On the other hand, moving from gas to liquid to solid requires the opposite: Heat must be released. These phase changes are called exothermic reactions.

### What happens to intermolecular bonds during endothermic phase changes?

Freezing, when a liquid transforms to solid Condensation, when a gas transforms to liquid In endothermic phase changes, intermolecular binds are broken, requiring energy. This is the energy that is absorbed. In exothermic phase changes, molecules bind to each other in a formation that requires less energy.