Define Avogadro's number and explain why it is important to know. 1  Define the mole. Be able to calculate the number of moles in a given mass of a substance, or the mass corresponding to a given number of moles. 2  Define molecular weight, formula weight, and molar mass; explain how the latter differs from the first two.
There are German Mennonite colonies in Argentina, Belize, Bolivia, Brazil, Mexico, Uruguay, and Paraguay, who are mostly descendants of Plautdietsch-speaking Mennonites who formed as a German ethnic group in what is today Ukraine. A small Mennonite congregation continues in the Netherlands where Simons was born.n the 1920s Russian Mennonites from Canada started to migrate to Latin America (Mexico and Paraguay), soon followed by Mennonite refugees from the Soviet Union. Further migrations of these Mennonites led to settlements in Brasil, Uruguay, Belize, Bolivia and Argentina.
The findings of Professor Avi Gopher and Dr Ran Barkai of the Institute of Archeology at Tel Aviv University, published last week in the American Journal of Physical Anthropology, suggest that modern man did not originate in Africa as previously believed, but in the Middle East.omo sapiens discovered in Middle Awash, Ethiopia, from 160,000 years ago were believed to be the oldest 'modern' human beings. Other remains previously found in Israeli caves are thought to have been more recent and 80,000 to 100,000 years old.