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media type="youtube" key="4_TlXvJPCho" height="385" width="480"  Then, to initiate the combustion reaction, simply remove the tape and hold a burning match or long lighter briefly to the top hole. If you have two eggs ready, ignite one in full light and the other in the dark. Compare the sound and light from the two explosions. 
 * 1) Fill the blown egg completely with hydrogen gas. (For instructions on blowing eggs, see the lab hints.) To do this, cover the top hole with a piece of electrician's tape, and introduce the hydrogen slowly through the bottom hole using the thin plastic tube extended upward almost to the top of the egg. **From a hydrogen lecture bottle**: With the flow rate set at a minimum, charge the egg for 30-40 seconds to ensure a thorough flushing out of any air. **From a flask**: Place mossy zinc in the flask, add 100 mL of 1 M HCl, stopper securely with the thin plastic tube extending upward out of the stopper hole, and place the egg over the tube for 1-2 minutes.
 * 2) Using the top of the soda bottle as a support, stand the egg in an upright position with the taped hole on top. [Remember to have a safety shield between the egg and the audience.]
 * Stand back!**
 * 1) After a small initial "pop" sound, nothing appears to happen. Then, a short while later: "BOOM," and the egg is gone.
 * 1) Each reaction mixture ignites slightly differently. Diffusion of air into the egg depends on the size of the upper and lower holes.
 * 2) If you are using a flask to generate the hydrogen, stop the production of hydrogen as described in the "Disposal" section. **Methane Variation - The Flashing Egg**Follow the same procedure described for the hydrogen egg, but make the holes each about 10 mm in diameter and charge the egg with methane from the gas jet (for only about 3-5 seconds!).
 * a lecture bottle of hydrogen or
 * 20 g mossy zinc
 * 100 mL 1.0 M HCl (1 liter -- Add 83 mL of 12 M HCl, hydrochloric acid solution to approximately 550 mL of water. After the solution equilibrates, dilute to 1000 mL with water.)
 * 250-mL flask with one-holed stopper to fit
 * 2-3 eggs, any size
 * an ice pick or a sharp nail
 * 10-15 cm of wire
 * a piece of electrician's tape
 * the upper portion of a plastic 2-L soda bottle, to serve as a small base for the egg
 * 1 thin, plastic tube (such as the stem of a thin-stem plastic pipet) (OD < 3 mm)
 * safety shield -- For a normal chicken egg, a 2-L soda bottle cut vertically to form a semicircular shield may suffice.
 * a butane lighter, preferably with extended nozzle (such as the Scripto Aim 'n Flame® Torch lighter -- widely available in grocery stores for $3 .00 - $4.00)