Cohesion and Adhesion
Explain why the water evaporated more slowly?
Because
Surface Tension
Behavior that results from cohesion molecules at surface of liquid don't have other like molecules on all sides of them (polar=different charged ends)
What is "salting out" a soap
When you separate the soap from the glycerol and saturated NaCl solution is added
Capillary Action
Combination of cohesion and adhesion The thinner the tube the farther up tube the water will fill
Wetting Agent
Increases adhesion and decreases cohesion
Why does acetone have less cohesion?
The acetone is nonpolar meaning it will spread and disperse across the skin because it is also nonpolar
acetone
evaporates faster
water
evaporates slower
acetone
nonpolar molecules
skin
nonpolar molecules
Unsaturated fats
normally liquids have double bonds in the hydrocarbon tail -C=C-C
water
polar molecules
water
show greater cohesion
acetone
shows greater adhesion
Saturated fat
solids at room temperature C-C-C-H
acetone
spreads out
water
stays beaded up
Surfactants
substances (chemicals) that allow insoluble substances to come into closer physical contact
Adhesion
the property of different molecules or surfaces clinging to each other
Cohesion
the property of molecules of the same substance sticking to each other due to mutual attraction
Detergent water
Adhesive Wetting Agent