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a group of atoms held together by chemical bonds.
small electrical cells such as those in watches, pacemakers, hearing aids and calculators.
the energy required to break the bonds of the reactants and start a reaction.
the process whereby a mixture of two or more different monomers react to form a polymer.
reactions in which two or more molecules react to form one molecule.
the part of the atmosphere that extends to a height of 10 km above the surface of the Earth.