What is C2H2? Important knowledge about C2H2.

Definition of C₂H₂
1.1 C₂H₂, also known as ethyne or acetylene, is an unsaturated hydrocarbon, a type of organic compound that contains a triple bond between two carbon atoms.
1.2 The molar mass of C₂H₂ is 26.04 g/mol.
1.3 The molecular structure of C₂H₂ includes two carbon atoms and two hydrogen atoms. The carbon atoms are connected by a triple bond, while each hydrogen atom forms a single bond with a carbon atom.
1.4 C₂H₂ does not form ions as it is a non-ionic compound.

Properties of C₂H₂
2.1 Physical properties: C₂H₂ is a colorless, odorless gas, with no specific pH level.
2.2 Chemical properties: C₂H₂ is highly flammable and produces a bright flame, it also easily reacts with metals and non-metals.

Common chemical reactions of C₂H₂:
3.1 Reactions with metals: C₂H₂ can react with metals such as Cu, Ag, Hg to form corresponding acetylides.
3.2 Acid reactions: C₂H₂ does not react with acids under normal conditions, but it can react in the presence of a catalyst.
3.3 Reactions with non-metals: C₂H₂ can react with non-metals such as O₂, Cl₂, and Br₂ to form corresponding compounds.
3.4 Reactions with salts: C₂H₂ does not directly react with salts.

Preparation of C₂H₂
4.1 Lab preparation: C₂H₂ can be prepared by heating calcium carbide (CaC₂) in water.
4.2 Industrial preparation: Industrially, C₂H₂ is usually produced by heating coal and lime in a horizontal furnace.