Page 22 - Encyclopedia of Chemical Compounds 3 Vols

CHEMICAL COMPOUNDS

timeline of t he
of the
tim l

development
vel

e ical
of chemical

compounds
pounds

c. 3000 BCE • Egyptians develop a method for converting
gypsum to plaster of Paris, which is then used as mortar
to join blocks in buildings.

c. 2700 BCE • Chinese documents mention sodium chloride
and the consumption of tea.

c. 1550 BCE • The analgesic properties of willow tree bark,
from which salicylic acid comes, are described in Egyp-
tian scrolls.
c. 1000 BCE • Ancient Egyptians use dried peppermint leaves.

800 BCE • Chinese and Arabic civilizations use borax for mak-
ing glass and in jewelry work.

xxi