When copper is heated, it decomposes to form copper oxide and carbon dioxide. It is an endothermic reaction, which means that it absorbs heat. When heated, copper is easily bent or molded into shapes.
When copper is heated, the many small crystals of metal grow into each other and form fewer, larger crystals. Copper usually has impurities, but it is commonly in a fairly pure state. Native copper is found only in a few locations throughout the world. Copper is one of the most famous and useful metals, and it has been important for ornaments and coinage dating back to ancient civilizations.