The internal energy and temperature of a system decrease (E E. The System and Work. The system is usually defined as the chemical reaction and the boundary is the container in which the reaction is run. In the course of the reaction, heat is either given off or absorbed by the system.
The Middle Ages began in the year 476 A.D. and ended around 1300 with the beginning of the Renaissance. The Middle Ages, also called the Medieval Period, began just after the fall of Rome and it dominated the European continent through the early 14th century. The Middle Ages filled a time period between the ending of a great reign and the beginning of a new era characterized by revitalization and cultural growth.
Confidence votes 5. Guesses The medieval or middle ages began with the fall of the Roman Empire, ca, 500 A.D. The era lasted approximately one thousand years or until the Renaissance period ca, 1500 A.D. have come to these dates for the Middle Ages as it has been recorded in English history documents that Richard III of England was recorded as the last King of the Medieval era thus this marks the end of the Middle Ages/Medieval period as being in the 1400's.