-: MODEL OF A VOLCANO :-

The chemical volcano is based on the endothermic decomposition of ammonium dichromate. It portrays a volcanic eruption clearly.

• Take an asbestos wire gauge of 12 inch X 12 inch size. (It is available in your chemistry laboratory.)
• Build a volcanic cone with ordinary wet clay about 8 inch in diameter and 12 inch in height. Make a 2 inch deep cavity in the cone with the help of a wooden stick when the clay is wet. Dry it in the sun for two-three days.

•  Mix 65 gm of magnesium powder with 250 gm of ammonium dichromate powder.

• Put the asbestos gauge with the volcanic cone on a tripod stand and heat its central part with the flames of a Bunsen burner.
•  Pour some mixture into the cone of the volcano. The smoke with sparks due to, the formation of nitrogen will come out and give the appearance of a volcanic eruption.