Properties of Solutions- Distillation of Liquid “Air”

Ammonia Fountain

Chemiluminescent Ammonia Fountain

Crystallization from Supersaturated Solutions of Sodium Acetate

Density and Miscibility of Liquids

Electrical Conductivity of Liquids and Solutions

Lava Lamp

Model of Osmotic Pressure

Multiple Ammonia Fountain

Osmotic Pressure of  Sugar Solution

Reverse Solubility

Vapor Pressure of Solutions: Raoult’s Law

A Visual Demonstration of Raoult’s Law

Water Softening– Hard and Soft Water With Soap

Canned Heat: Alcohol Gels

Clean Air With Cottrell Precipitator

Color of Sunset: Tyndall Effect

Dialysis of a Mixture

Getting Colder: Freezing Point Depression

Getting Hotter: Boiling Point Elevation by Nonvolatile Solutes

Making Liquids Immiscible II

Root Beer Fountain

Salting Out: Making Liquids Immiscible

Soap Emulsifies Hydrocarbons

Volume Decreases When Mixing

Volume Increase Upon Neutralization

Diffusion of a Liquid

Shapes of Soap Films and Bubbles

Solubility of Benzoic Acid

Luminol Reaction with Hemin

Distillation of Liquid “Air”

Solubility of Carbon Dioxide in Water

Distillation of Liquid “Air”

The first photo shows a hand holding a wooden splint in white vapor rising out of a glass beaker. Orange light is seen through the vapor. A capped blue container is next to the beaker. In the second photo, a hand holds a lit wooden splint above the vapor rising from the beaker. A lit candle appears on the right side of the beaker, and the capped blue container is seen on the left side of the beaker.
The first photo shows a hand holding a wooden splint in white vapor rising out of a glass beaker. Orange light is seen through the vapor. A capped blue container is next to the beaker. In the second photo, a hand holds a lit wooden splint above the vapor rising from the beaker. A lit candle appears on the right side of the beaker, and the capped blue container is seen on the left side of the beaker.
 

Description: A 50/50 mixture of liquid N2/O2 is poured into a beaker of room temperature water. The liquids turn to gases and as the boiling continues, more of the Oxygen gas remains as a percentage of total liquid gases in the water. After several seconds, a quenched splint ignites where a few seconds ago it would not ignite.

Source: UW Card Catalog

Year:  N/A    Vol:  N/A   Page:  N/A

Keywords: Air, Oxygen, Boiling points, Combustion, Nitrogen

Rating:

Hazard: Medium

  • Cryogenic burn hazard
  • Contains gas under pressure/ explosion hazard
  • Asphyxiation hazard
  • Inhalation hazard
  • Oxidizer
  • Implosion hazard
  • Electric shock hazard

Effectiveness: Average

  • Results are observable with guidance
  • Somewhat connected to course material
  • Mild effects are seen by audience
  • Time to results is medium
  • Contrast between behavior of systems is noticeable
  • Good reliability

Difficulty: Medium

  • Demos at non-standard conditions
  • Some intermediate steps to results
  • Use of scientific equipment
  • Some careful manipulations is required
  • Simple procedures

Safety Precautions:

  • Eye protection required
  • Gloves required
  • Cryogenic gloves required
  • Protective clothing recommended
  • Prepare in a well-ventilated area
  • Use UL approved three-prong plug and outlet
  • ABC fire extinguisher on hand

Class: Intermolecular Forces, Separations

Division: General Chemistry

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