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a way of indicating the valencies in the names of the compound. Stock notation uses Roman numerals in parentheses to show differing valencies.
a clear glassy material possessing good heat and electrical insulating properties.
a process that takes energy into the system. This increases the internal energy of the system (...
the stratosphere extends from a height of 10 km to 50 km above the surface of the Earth.
a reaction that takes place automatically by itself, without requiring extra stimulation.
the amount of energy required to change the temperature of a substance.