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polymer a large, complex, carbon-based molecule built from smaller molecules joined together monomer a small, carbon-based molecule from which polymers are built cellulose a flexible, but strong natural polymer that gives shape to plant cells composite a combination of two or more substances that creates a new material plastic a synthetic polymer that can be molded or shaped alloy a substance made of two or more elements that have the properties of metal ceramics a hard, crystalline solid made by heating clay and other minerals to high temperatures glass a clear, solid material with no crystalline structure, created by heating sand to a very high temperature optical fiber a threadlike piece of glass (or blastic) that can be used for transmitting messages in the form of light properties of metal -has a luster -can conduct electricity -they are ductile -flexible, strong -can conduct heat -dent on impact -can withstand high temperatures properties of glass/ceramic -shatters on impact -can't conduct heat -can withstand extremely high temperatures -not flexible, or strong -can't conduct electricity -(glass) is shiny, (ceramics) are not properties of plastics -no luster -can't conduct heat -they are ductile -can't conduct electricity -very tough -won't damage on impact -can't withstand high temperatures