Assertion: anode | /r/HasProperty | impure metal
Facets:
value: at the beginning of the operation
type: TEMPORAL
Source sentences:
text: the anode is the impure metal and any impurities are removed during the process of electrolysis when the metal travels from anode to cathode.
text: At the beginning of the operation, the anode is impure copper.
text: During this process, the cathode is a pure piece of copper, while the anode is an impure piece of copper.