Calcium oxide15 is known as lime1116 and is one of the top 10 chemicals1217 produced annually by thermal decomposition of limestone. The thermal decomposition of calcium carbonate to lime18 is one of the oldest chemical reactions known. For several thousand years, lime has been used in mortar (a paste of lime, sand and water) to cement stones to one another in buildings, walls and roads. The setting of mortar involves several chemical reactions.
1 Congregation Shearith Israel, 1654, Upper West Side, Manhattan, is the oldest congregation in New York and the United States. 2  Temple Society of Concord, 1839, Syracuse, New York.  Angel Orensanz Center, 1849, Lower East Side, Manhattan, is the oldest synagogue building still standing in New York State.
Hebron: Table of Contents | Tomb of the Patriarchs | Kiryat Arba. Tweet. Hebron, located in the Judean hills south of Jerusalem, is the site of the oldest Jewish community in the world, dating back to Biblical times. Today, Hebron is home to some 250,000 Palestinians and approximately 700 Jews.