Preparation and Properties of Liquid Oxygen
Description: Liquid oxygen is prepared and is paramagnetic. When in the field of a strong magnet, the liquid oxygen is trapped between the poles of the magnetic field.
This demonstration is also available on video and on JCE Software “Chemistry Comes Alive!” Vol. 2 CD-Rom.
Source: Shakhashiri, B.Z. Chemical Demonstration: A Handbook for Teachers of Chemistry
Year: 1985 Vol: 2 Page: 147
Keywords: Oxygen, Liquid, Paramagnetism, Nitrogen, Molecular structure, MO theory
Rating: 
Hazard: Medium
- Cryogenic burn hazard
- Oxidizer
- Asphyxiation hazard
- Skin irritation
- Eye irritation
- Electric shock hazard
- Gases under pressure – explosion hazard
- Implosion hazard – Dewar flask
Effectiveness: Excellent
- Deeply engaging
- Superior reliability
- Spectacular effects are seen by audience
- Excellent connection to course material
- Time to effects is low
- Challenges preconceived notions
Difficulty: Medium
- Sequential manipulations
- Use of cryogenic equipment
- Demos at non-standard conditions
- Demos in which a display is used
- Prior training recommended
Safety Precautions:
- Cryogenic gloves required
- Eye protection required
- Temperature resistant surface recommended
- Perform in a well-ventilated area
- Use UL approved three-prong plug and outlet
- Avoid exposure to open flames
- Secure pressurized tanks during use and transport
Class: Bonding, Physical Chemistry, Intermolecular Forces
Division: General, Inorganic Chemistry
Home| General Chemistry Demonstrations| Inorganic Chemistry Demonstrations