The movie was adapted by Dashiell Hammett and Lillian Hellman from Hellman's play. It was directed by Hal Mohr[?] (uncredited) and Herman Shumlin[?].
It won the Academy Award for Best Actor (Paul Lukas} and was nominated for Best Actress in a Supporting Role (Lucile Watson), Best Picture and Best Writing, Screenplay.
... Fe2+ -> Fe3+ + e-
(2) Cl2 + 2e- -> 2Cl-
Combining the two half-reactions brings the chemical formula:
(5) Cl2 + 2e- + 2Fe2+ -> 2Cl- + 2Fe3 ...
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