Comparing the Specific Heat of Metals I
Comparing the Specific Heat Of Metals II
Paramagnetism of Transition Metal Salts
Computer NaCl Crystal Cleavage
Octahedral, Hexagonal, and Tetrahedral Shapes
Thermoluminescent Sodium Chloride
Jars of Sand Representing Electron Flow in a Band
Temperature Dependence on Resistance
Thermal Conductivity of Metals
Glycerine Tube Representing Hole Energies
Counting Photons Using a Solar Cell
Effect of Pressure on the Melting Point of Ice
Fixed Ball and Stick Crystal Models
Will a Tissue Hold Water? Interfacial Tension
Description: Scotchguard is sprayed on a piece of facial tissue and allowed to dry. Water is poured into the tissue, and the tissue holds the water. Water is poured onto another facial tissue that has not been treated, and the tissue breaks.
Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry
Year: 1989 Vol: 3 page: 305
Keywords: Scotchguard, Facial tissue, Water, Hydrophobicity
Rating: 
Hazard: Some
- Acute toxicity hazard
- Flammability hazard
- Specific organ toxicity – central nervous system
- Inhalation hazard
- Chemicals that produce flammable gases
Effectiveness: Good
- Results are clearly observable without guidance
- Good connection from demo to course material
- High reliability
- Systems contrast is noticeable
- Time to results is medium
- Primary effects
Difficulty: Some
- Simple procedures
- Some intermediate steps to results
- Careful manipulations required
- Prior training recommended
Safety Precautions:
- Eye protection required
- Gloves recommended
- Absorbent material on hand
- ABC fire extinguisher on hand
- Perform in a well-ventilated area
Class: Liquids and Solids, Intermolecular Forces, Thermodynamics
Division: General, Physical Chemistry, Material Science/ Solid State Chemistry Chemistry