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 Middle Ages are a time period in European history. They started around the year 476 CE when the Western Roman Empire ended, and continued until around the time Christopher Columbus discovered the New World in 1492.The 'Middle Ages' are called this because it is the time between the fall of Imperial Rome and the beginning of the Early modern Europe.he Late Middle Ages were the last two centuries of the Middle Ages, from 1300 to 1492. During this period the gun changed war and aristocracy and feudalism became less important. States founded standing armies. Before, armies were only formed when there was a war.