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.
Most historians date the end of the Middle Ages to the fall of the Byzantine Empire, in 1453. Some use 1485, the date of the end of the War of the Roses. Others use 1492, when â¦ Columbus sailed. Some would like to use the invention of the printing press, but no one really knows when that happened.