OCR Gateway A (9-1) C4.1.2 - Group 7 The Halogens Summary

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OCR Gateway A revision video for Chemistry and Combined Science on C4 - The Halogens for the foundation and higher tier. First exams in 2018.
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Dont we need to know the equation for dilute hydrochloric acid

Ibby_yh
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If halogens need to gain one electron for a full outer shell then why in the reaction have you added two electrons @6:05 in the video

danielledanquah