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types of chemical âunitsâ â could be atoms, molecules, molecular fragments, simple or polyatomic ions.
a way of indicating the valencies in the names of the compound. Stock notation uses Roman...
the ratio of the amount of a pure compound to the amount of substance containing that compound...
substances such as elements or compounds, that cannot be broken down into simpler substances by...
a process that takes energy into the system. This increases the internal energy of the system (...