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a method used to refine petrol by breaking covalent bonds between carbon atoms using heat and a catalyst.
polyvinyl acetate, a colourless thermoplastic material used in inks and adhesives.
a group of organic molecules formed by condensation of two alcohol molecules.
(also called dative covalent bond) one atom contributes both electrons (or a lone pair of...
electrons that have become removed from the atom and form a âseaâ or region to which the...