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a chemical reaction in which heat, pressure or a catalyst is used, singly or in combination, to rearrange the atoms in molecules to form new molecules.
organisms that use dead organic material as a food source and thus recycles them.
a polymer used in manufacture of synthetic resins, fibres and plastics.
a substance that improves the efficiency of a catalyst is called a promoter.
when radioactive particles collide with air molecules, they can cause the molecules to lose or...