These colligative properties are… The pressure within a solution – pushing out because it wants to evaporate! Atmospheric pressure usually prevents.

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Colligative Properties

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Presentation transcript:

These colligative properties are…

The pressure within a solution – pushing out because it wants to evaporate! Atmospheric pressure usually prevents this from happening by pushing back down. But – when vapor pressure and atmospheric pressure are equal, it boils!

Point at which vapor pressure (pushing up) equals atmospheric pressure ( Heat is only needed to get vapor pressure up high enough to equal the downward push of atmospheric pressure! pushing down).

Temperature is a measure of kinetic energy of particles. Low temp. = low kinetic energy Particles slow down, get close together and solidify kinetic energy of solids

What kinds of solutes affect colligative properties?

Ionic Solutes dissociate into: NaCl  MgCl 2  Na 3 PO 4  2 moles of ions 3 moles of ions 4 moles of ions 1 Na Cl -1 1 Mg Cl -1 3 Na PO 4 -3

The solutes below are placed into water. What happens to these solutes as they begin to dissolve? C 6 H 12 O 6  C 12 H 22 O 11  **They dissociate one molecule at a time! 1 C 6 H 12 O 6 1 C 12 H 22 O 11 1 mole of particles