Hard-Boiled Egg

Hard-Boiled Egg

Credit: Gerad Bandos

 
Author: Gerad Bandos
Description:
Purpose: Demonstrate Guy-Lussac's Law by sucking a hard-boiled egg into a flask.
Usage:
No Description available
 
Futher Images
tn_hard-boiled-egg-2-p1-62.gif tn_hard-boiled-egg-2-p2-62.gif tn_hard-boiled-egg-2-p3-62.gif  
Credits, from left: Gerad Bandos, Gerad Bandos, Gerad Bandos
 
Safety:
Wear safety goggles at all times. Do not consume the egg after it has been used. Do not handle the hot flask with your bare hands.
 
Equipment:
No Description available
 
Materials:
1 hard boiled egg To make a hard-boiled egg: Fill a saucepan with cold water, about 2-3 inches. Bring to a vigorous boil. Quickly reduce to medium boil. Cook for 10 more minutes. Remove from heat and place immediately into ice-water. To peel, crack gently and roll firmly between hands to crack whole shell. Run under water and peel the shell. The shell should come off in large pieces. 1 500-mL Erl flask 1 bowl ice water heat source thermometer long knife or scoopula
 
Procedure:
Heat Erl. flask gently to ~95°C. Monitor heating with thermometer. Place egg resting on neck of flask. Narrow end must be down. Immediately remove from heat. Place into ice water. Result should yield within 5 seconds. To remove the egg, slice inside flask using long knife or scoopula.
 
Notes:
Explanation: The sudden drop in temperature inside the flask from ~100°C to ~0°C creates a drop in pressure. The decreased pressure is enough to suck the egg into the flask.
 
Disposal:
No Description available
 
Difficulty:No specific experience required
Preparation Time:15 minutes Demonstration Time: 1 minutes
Availability of Materials:Local grocery store
Cost of materials:$1
Last Updated:Tue 09 Aug 2011 12:44:21 EDT Viewed:180164 times viewed
Source:ChemEd DL, Gerad Bandos, 10 Dec 2008, ChemEd DL