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group or organic hydrocarbons, having single bonds between carbon atoms.
(also called or polypropylene) colourless transparent thermoplastic used where a flexible...
if the equilibrium of a system is disturbed by a change in temperature, pressure or...
large deposits formed from the excrement and bodies of seabirds. Often found on islands.
molecule where the ratio of atoms is 1 : 5, for example PCl5
a group of atoms that are bonded together. It has an unequal number of protons and electrons and...