Editing Green Volcano (section)

== Demonstration ==

# Lay out the plastic tablecloth on the table, and put the watch glass or petri dish in the center. Put on the gloves and safety goggles, and set the small blast shield in front of the dish. Use the scoopula to scoop out some of the salt onto the dish, making a small mound. The mound should be centered in the dish, with a minimum of <sup>1</sup>/<sub>2</sub> in of room between the edges of the mound and the edge of the dish.
# Explain to the audience that the orange salt on the dish is Ammonium Dichromate, a strong oxidizing agent. State that unlike other oxidizers like H<sub>2</sub>O<sub>2</sub>, Ammonium Dichromate will quickly decompose without a catalyst.
# Show the matches and ask for a countdown. At the end of the countdown, light a match and hold it above the top of the mound. After warming for a few seconds, it will start sending out sparks!
# Back away and let the reaction run. The mound will send out orange-red sparks, and will start to make a pile of green flakes! Depending on the size of the mound, this reaction will run for 15-30 seconds as it sends out more sparks and becomes a bigger green pile.
# At the end of the reaction, show the students how big the green pile is compared to the original orange mound. Explain that the green flakes are Chromium (III) Oxide.
# Alert them that if you collected all the green flakes and weighed them, they would weigh less than the orange salt! If you have a white board, draw out the reaction to show where the missing mass went.