2. To compare the different states of issue in state ofpotential and kinetic energy

3. Explain the major events that happen along a heatingcurve.

You are watching: Is evaporation endothermic or exothermic

4. Analyze a phase diagram.

Key Terms:

vaporization condensationevaporation equilibrium vapor pressureboiling allude heat of vaporization freezingpoint warmth of fusionsublimation deposition heatingcurve step diagram

Notes: (14-4)

Matter on Earthexists as either liquid, solid, or gas. Various other than water, most matterexists in a single phase (liquid, solid, or gas) yet can it is in made to readjust phaseby including or deleting push or temperature.

Energy and also PhaseChanges

According come thekinetic-molecular theory, a substances step is determined by the balance of itskinetic and intermolecular forces. What this method is the you have the right to convertmatter from one phase to an additional by simply including or deleting kinetic energy(heat). When attempting to recognize the phase changes it is essential toremember what is occurring in endo and also exothermic reactions. Endothermic - energy is being absorbed - bonds room breaking - commodities are less ordered Exothermic - power is gift released - bonds are being created - assets are an ext ordered


(server.chem.ufl.edu/~itl/2045_s99/ lectures/FG11_024.GIF)

Changesin State:

liquid to gas - vaporization, by procedure of evaporation
solid to gas - sublimation
liquid to solid - freezing
gas to fluid - condensation
gas to solid - deposition


Evaporation is again explained by theKinetic-molecular theory. As soon as the kinetic power of the molecule in aliquid end up being greater than the intermolecular attractions in between them,evaporation occurs.

within a liquid, evaporation is constantly occurring come some level at the surface ar of the liquid
Temperature and evaporation price are directly related
Liquids v high evaporation prices are claimed to it is in volatile - typically flammable due to the visibility of organic materials and also oxides
Evaporation cools a surface ar or equipment by removed the molecules through the highest possible kinetic energy
Most remedies in a close up door container space in liquid-vapor equilibrium
condensation and also evaporation prices are equal
price of molecules leaving the solution space equal come the molecules entering the liquid
The solution is at equilibrium vapor pressure

Boiling Point:

The boiling allude of a liquid is directly relatedto the vapor push of the liquid. Vapor pressure is a measure of thevapor existing in a liquid. As soon as the vapor pressure equates to the atmosphericpressure cook occurs. It is essential to remember the vaporization i am one endothermic procedure as warm is gotten rid of from the liquid through boiling.

vapor push of a fluid is straight related come the temperature applied to the liquid
the boiling allude is straight related to the atmospheric pressure exerted ~ above the solution
boiling occurs once the vapor push = atmospheric pressure
the temperature the a liquid will remain continuous at the boiling point until every one of the fluid is vaporized.

Freezing and also Melting:

The freezing and also melting point out of a liquid existat the same temperature and represent an equilibrium between the fluid andsolid phases.

melting and freezing points are not greatly affected by atmospheric pressure
melting relies on the warm of blend which favor the boil is one endothermic process
freezing supplies the very same amount of energy as the heat of fushion bu is an exothermic process

Heating Curves:


((server.chem.ufl.edu/~itl/2045_s99/ lectures/FG11_024.GIF))

The heating curve is a representation of thephases of a substance contrasted to the temperature and also internal energy of asubstance. The blue lines represent the various phases that a substancewhile the red lines represent the heats of fusion and vaporization.

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endothermic reactions move from left to appropriate as the assets increase in kinetic energy and become less organized

Phase Diagrams


((server.chem.ufl.edu/~itl/2045_s99/ lectures/FG11_024.GIF))

The step diagram is one more representation ofthe internal energy of a substance compared with the pressure and temperature ofits surroundings.

temperature and also pressure are inversely related to the procedure of vaporization
pressure has little effect top top the melting and freezing of a substance
the triple suggest is a allude where all three phases happen in equilibrium