2. Compare the various states of matter in terms ofpotential and kinetic energy

3. Explain the major events that take place along a heatingcurve.

You are watching: Is water evaporating endothermic or exothermic

4. Analyze a step diagram.

Key Terms:

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

Notes: (14-4)

Matter on Earthexists as either liquid, solid, or gas. Various other than water, most matterexists in a solitary phase (liquid, solid, or gas) yet can be made to adjust phaseby adding or deleting press or temperature.

Energy and PhaseChanges

According come thekinetic-molecular theory, a substances step is identified by the balance of itskinetic and also intermolecular forces. What this way is the you have the right to convertmatter indigenous one step to an additional by simply adding or deleting kinetic energy(heat). As soon as attempting to understand the phase changes it is important toremember what is emerging in endo and also exothermic reactions. Endothermic - power is being soaked up - bonds room breaking - products are less ordered Exothermic - power is being released - bonds space being formed - products are more ordered


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

Changesin State:

liquid to gas - vaporization, by process of evaporation
solid to gas - sublimation
liquid to solid - freezing
gas to liquid - condensation
gas come solid - deposition


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

within a liquid, evaporation is always occurring come some level at the surface ar of the liquid
Temperature and also evaporation price are straight related
Liquids through high evaporation prices are said to it is in volatile - commonly flammable because of the visibility of necessary materials and oxides
Evaporation cools a surface or solution by removed the molecules v the greatest kinetic energy
Most remedies in a closed container space in liquid-vapor equilibrium
condensation and also evaporation prices are equal
rate of molecules leaving the solution are equal to the molecule entering the liquid
The systems is in ~ equilibrium vapor pressure

Boiling Point:

The boiling suggest of a fluid is directly relatedto the vapor push of the liquid. Vapor pressure is a measure up of thevapor existing in a liquid. Once the vapor pressure equates to the atmosphericpressure boiling occurs. That is necessary to remember that vaporization isan endothermic procedure as warm is gotten rid of from the liquid with boiling.

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

Freezing and Melting:

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

melting and freezing points room not greatly influenced by atmospheric pressure
melting counts on the warmth of fusion which prefer the boil is one endothermic process
freezing offers the exact same amount of power 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 that a substance contrasted to the temperature and also internal power of asubstance. The blue lines stand for the different phases that a substancewhile the red lines represent the heats of combination and vaporization.

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

Phase Diagrams


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

The phase diagram is an additional representation ofthe internal power of a substance contrasted with the pressure and temperature ofits surroundings.

temperature and pressure room inversely related to the procedure of vaporization
pressure has little effect top top the melting and also freezing the a substance
the triple allude is a point where all 3 phases happen in equilibrium