Chemical Concept Demonstrated
- Chemistry of alkynes
Crushed ice is covered over the bottom of a beaker.
Calcium carbide (CaC2) is sprinkled over the ice.
A match is dropped into the beaker.
An exothermic reaction occurs.
Explanation (including important chemical equations)
Calcium carbide reacts with water to form acetylene.
CaC2 (s) + H2O (l) --> Ca2+ (aq) +2 OH- (aq) + H2C2 (g)
In the presence of a flame, acetylene reacts with oxygen to form carbon dioxide and water.
2 H2C2 (g) + 5 O2 (g) --> 4 CO2 (g) + 2 H2O (g)
- Dr. George Bodner