The element ____ forms more compounds than all the other elements put together Carbon and its compounds are in a special branch of chemistry called ____ Chemistry. Materials in our world may be based on natural substances or may be ____ which means man-made. Proteins are ____ made up of chains of amino acids Petroleum or crude oil is an organic material comprised of a mixture of different sized ____ molecules with possible inorganic contaminates, including nitrogen, carbon dioxide, hydrogen sulphide. After crude oil is removed from the ground, it is sent to a ____ where different parts of the crude oil are separated into useable petroleum products. The first part of the refining process for crude oil in the refinery is called ____. Following distillation, heavy fuels can be processed further through other processes including ____ to obtain higher-value products. The word ____ derives from the Greek plastikos meaning "capable of being shaped or moulded". ____ are formed by chemical reactions in which many molecules are joined sequentially, forming a chain. ____ is a process involving many small, unsaturated monomers combining to form one large polymer molecule. Polymers made in this way are called addition polymers. In ____, a small molecule is formed as a by-product each time a bond is formed between two monomers. This small molecule is often water. The majority of manufactured polymers are ____, meaning that once the polymer is formed it can be heated and reformed over and over again. Other polymers - ____, cannot be re-melted. Once these polymers are formed, reheating will cause the material to ultimately degrade, but not melt. ____ is the process of recovering scrap or waste plastic and reprocessing the material into useful products.

A Plastic World Cloze Test

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