Русско-английский научно-технический словарь
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• When ferrous iron takes on oxygen, it turns a ferric red.
• Ammonium chloride can add (on) 3 to 6 molecules of ammonia to form complex salts.
• These materials have no tendency to gain protons.
• Thin conductors can be joined to members of similar thickness ...
• The isoalloxazine ring of FAD picks up a hydrogen ion from the solvent.
• An impurity atom which can accept (or take up) one or more electrons ...
• The sulphur hexafluoride molecule readily acquires (or adds on) free electrons, forming a heavy negative ion.