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those properties that can change without changing the chemical nature of a substance.
a process that takes energy into the system. This increases the internal energy of the system (...
a diagram that shows the electrons in the outermost occupied shell of an atom as dots or crosses...
polyvinyl acetate, a colourless thermoplastic material used in inks and adhesives.
Niels Bohr put forward the theory that electrons move in certain orbits about the nucleus.