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.
The High Middle Ages. The High Medieval Era is the period of time that seems to typify the Middle Ages best. Usually beginning with the 11th century, some scholars end it in 1300 and others extend it for as much as another 150 years.he end of the Middle Ages can be characterized as a transformation from the medieval world to the early modern one. It is often considered to begin in 1300, though some scholars look at the mid-to late-fifteenth century as the beginning of the end. Once again, the end of the end is debatable, ranging from 1500 to 1650.