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

3. Describe the significant events that take place along a heatingcurve.

You are watching: Is evaporation of water endothermic or exothermic

4. Interpret a phase diagram.

Key Terms:

vaporization condensationevaporation equilibrium vapor pressureboiling suggest warm of vaporization freezingallude heat of fusionsublimation deplace heatingcurve phase diagram

Notes: (14-4)

Matter on Earthexists as either liquid, solid, or gas. Other than water, a lot of matterexists in a single phase (liquid, solid, or gas) but can be made to adjust phaseby including or deleting push or temperature.

Energy and also PhaseChanges

According to thekinetic-molecular concept, a substances phase is identified by the balance of itskinetic and intermolecular pressures. What this indicates is that you deserve to convertmatter from one phase to another by simply including or deleting kinetic energy(heat). When attempting to understand the phase alters it is essential toremember what is emerging in enperform and also exothermic reactions. Endothermic - Energy is being took in - bonds are breaking - assets are less ordered Exothermic - Energy is being released - bonds are being created - products are even more 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
gregarding liquid - condensation
gregarding solid - deposition


Evaporation is aget explained by theKinetic-molecular concept. When the kinetic energy of the molecules in aliquid become higher than the intermolecular attractions in between them,evaporation occurs.

within a liquid, evaporation is always emerging to some level at the surchallenge of the liquid
Temperature and evaporation rate are straight related
Liquids through high evaporation rates are said to be volatile - commonly flammable due to the existence of organic materials and also oxides
Evaporation cools a surconfront or solution by rerelocating the molecules via the highest kinetic energy
Many remedies in a closed container are in liquid-vapor equilibrium
condensation and also evaporation rates are equal
price of molecules leaving the solution are equal to 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 meacertain of thevapor present in a liquid. When the vapor pressure equates to the atmosphericpress boiling occurs. It is vital to remember that vaporization isan endothermic process as heat is removed from the liquid via boiling.

vapor press of a liquid is directly related to the temperature applied to the liquid
the boiling suggest is directly pertained to the atmospheric press exerted on the solution
boiling occurs once the vapor push = atmospheric pressure
the temperature of a liquid will remajor consistent at the boiling suggest until all of the liquid is vaporized.

Freezing and also Melting:

The freezing and also melting points of a liquid existat the same temperature and reexisting an equilibrium between the liquid andsolid phases.

melting and freezing points are not greatly impacted by atmospheric pressure
melting depends on the warmth of fusion which choose the boiling is an endothermic process
freezing offers the very same amount of power as the warmth 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 depiction of thephases of a substance compared to the temperature and internal power of asubstance. The blue lines reexisting the different phases of a substancewhile the red lines recurrent the heats of fusion and vaporization.

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endothermic reactions relocate from left to best as the assets boost in kinetic energy and end up being much less organized

Phase Diagrams


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

The phase diagram is another representation ofthe interior power of a substance compared via the push and also temperature ofits surroundings.

temperature and push are inversely related to the procedure of vaporization
press has bit effect on the melting and also freezing of a substance
the triple point is a allude wbelow all three phases take place in equilibrium