Balloon Full of Carbon Dioxide
Effect of Pressure on Melting Point of Ice
The Liquid Phase of Carbon Dioxide
Vapor Pressure of Pure Liquids
Boiling Acetone at Reduced Pressure
Magic Sand Models Hydrophobic Effect
Surface Tension: Floating Duck
Surface Tension of Water: The Floating Paper Clip
Will Tissue Hold Water? Interfacial Tension
Computer NaCl Crystal Cleavage
Variation of Volume of Water With Temperature
Surface Spreading and Surface Tension
Gel Formation with Sodium Alginate and Calcium Chloride
Boiling Acetone or Water at Room Temperature
Density and Sulfur Hexafluoride and Sublimation of Certain Gases
Which Will Evaporate First?
Description: The evaporation rate of liquid is observed by wiping a cotton ball saturated with the liquid on a chalkboard and observing the smear disappear. Several pairs of liquids with different molecular characteristics are compared.
Source: Journal of Chemical Education
Year: 1987 Vol: 67 Page: 351
Keywords: Evaporation rate, Liquid, Cotton ball, Vapor, Chalkboard, Intermolecular Forces
Rating: 
Hazard: Some
- Inhalation hazard
- Acute toxicity hazard
- Carcinogenicity hazard
- Eye irritation hazard
- Organ toxicity hazard – central nervous system
- Flammability hazard
- Chronic toxicity hazard
- Specific organ toxicity – eyes
Effectiveness: Average
- Results observable with guidance
- Mild effects are seen by audience
- Noticeable contrast between behavior of systems
- Time to results is medium
- Some connection from demo to course material
Difficulty: Low
- Simple procedures
- Simple manipulations for most to perform
Safety Precautions:
- Eye protection required
- Gloves required
- Lab coat recommended
- Perform in a well-ventilated area
- ABC fire extinguisher on hand
- No open flames or spark
- Absorbent materials on hand
Class: Intermolecular Forces, Liquids and Solids
Division: General
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