Q:

Is evaporation exothermic or endothermic?

A:

Evaporation is an endothermic process. These types of reactions occur when the temperature of the system decreases and the surroundings gain energy. Endothermic reactions end up with an overall positive heat of reaction.

Endothermic reactions absorb energy from the reactions instead of releasing energy into their surroundings. Endothermic reactions have a positive heat of reaction and a positive enthalpy value. The enthalpy value is positive because endothermic reactions produce high enthalpy and high energy products. As a result the products of endothermic reactions have higher energy and enthalpy than the reactants. The other reaction type is exothermic. These reactions release energy into their surroundings and have an overall negative heat of reaction and change in enthalpy.


Is this answer helpful?

Similar Questions

  • Q:

    What are the types of vaporization?

    A:

    Evaporation and boiling are two vaporization types. Evaporation involves the change of the phase of an element from liquid to gas, at temperatures lower than its boiling point, at a given pressure. Boiling involves a change of phase from liquid to gas at a temperature higher than its boiling point.

    Full Answer >
    Filed Under:
  • Q:

    What happens during evaporation?

    A:

    During evaporation, water rises into the atmosphere and condenses into clouds. When the clouds absorb too much moisture and become heavy, the moisture falls to the ground in the form of precipitation. This is known as the water cycle, which involves evaporation, condensation and precipitation.

    Full Answer >
    Filed Under:
  • Q:

    Why is evaporation a cooling process?

    A:

    Evaporation is a cooling process because when liquid turns to gas, it needs more energy, and so it has to take that energy from its surroundings. The energy is in the form of heat, and when the heat energy leaves with the evaporating liquid, the surroundings get cooler as a result. This has to do with the properties of the different states of matter.

    Full Answer >
    Filed Under:
  • Q:

    What is the importance of radioactivity?

    A:

    Although it can be destructive, radioactivity is also beneficial, especially when it comes to medical tests and certain medical treatments. Not only can radiation find tumors within the body, it can also destroy them or slow their growth. Without radiation, society would not have medical imaging technology, such as X-rays. Radiation also makes it possible to study matter, plants and animals in an effort to understand the universe better.

    Full Answer >
    Filed Under:

Explore