Equilibrium of Chemical Systems- The Drinking Bird

Water Cryophorus Tube

Equilibrium Between Nitrogen Dioxide and Dinitrogen Tetroxide

Effect of Pressure on Melting Point of Ice

Ice Bomb

The Liquid Phase of Carbon Dioxide

Vapor Pressure of Pure Liquids

The Drinking Bird

Getting Colder: Freezing-Point Depression

Getting Hotter: Boiling-Point Elevation by Non-Volatile Solutes

Model of Osmotic Pressure

Osmotic Pressure of a Sugar Solution

Vapor Pressure of Solutions – Raoult’s Law

Volume Decreases Upon Mixing

Boiling Two Liquids at Room Temperature

Salting Out: Making Liquids Immiscible

Making Liquids Immiscible II

Aluminum & Oxygen Battery

Cathodic Protection

Concentration Cell

Electrolysis of Potassium Iodide

Electrolysis of Water

Voltaic Cells

Display Batteries

Fuel Cell

Hydrogen Ion Concentration Cell

Acid-Base Properties of Amino Acids

Electrical Conductivity of Liquids and Solutions

Instrumental Recording of a Titration Curve

A Visual Demonstration of Raoult’s Law

The Drinking Bird

Description: This demo illustrates that the evaporation of water is endothermic.

This demonstration is also available on JCE Software “Chemistry Comes Alive!” Vol. 2  CD-Rom.

Source: Shakhashiri, B.Z.  Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year: 1989  Vol: 3  Page: 249

Keywords: Happy bird, Dichloromethane, Ethanol,  Evaporation, Endothermic

Rating:

Hazard: Some

• Sharps hazard
• Acute toxicity hazard
• Mild flammability  hazard
• Eye irritation hazard

Effectiveness: Average

• Results are observable with guidance
• Mild effects are seen by audience
• Noticeable contrast between systems
• Good reliability
• Time to results is medium

Difficulty:  Low

• Manipulations are simple for most to perform
• Some intermediate steps to results
• Simple procedures

Safety Precautions:

• Eye protection required
• Gloves recommended
• Absorbent materials on hand
• Handle glass object with care