1. Notes: Special Properties of Liquids (13.1/13.3 add-on)
OBJECTIVES: Students will be able to (SWBAT)
Explain special properties of liquids due to IMFs
QUESTIONS TO PONDER:
How is viscosity and surface tension affected by IMFs?
Explain how IMFs are related to the use of chromatography?

2. Special Properties of Liquids
Viscosity
Surface Tension
Capillary Action

3. Viscosity Resistance of a liquid to flow because of IMFs
High viscosity  thick  flows more slowly
Honey, syrup
Low viscosity  more “liquidy”  flows more rapidly
Water, many other liquids
As temperature increases, viscosity will decrease (flows faster)  less IMF because particles are farther apart

5. Surface Tension
Liquids particles of surface sticking to each other due to IMFs  cohesion
Molecules at or near the surface tend to contract the surface into smallest possible area

6. Surface tension is the reason for…
Ability to walk on water
Beads of droplet form
Belly flops

7. Capillary Action
Ability of liquid to flow up narrow spaces opposite gravity
Occurs due to IMF between liquid and solid surface it is in contact with  adhesion
If adhesion > cohesion  goes up
Reason for water going up stems of plants

8. Capillary Action
Reason for water going up stems of plants

9. Chromatography
A lab technique that uses capillary action to separate mixtures
Separates mixtures based on different polarities of molecules and IMFs
↓ polar  travels farther up (repelled by solvent)
↑ polar  doesn’t travel up as far (attracted to paper and solvent)