Predict and explain halogen displacement reactions.

In the subtopic Halogen trends and displacement, this AQA A-Level Chemistry 7405 learning objective focuses on predict and explain halogen displacement reactions. It belongs to Group 7(17), the halogens, so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include halogen, displacement. Oxidising ability. means the tendency of a substance to gain electrons and be reduced, which increases down Group 7 for halogens Avoid the mistake of students often confuse the reactivity of halogens and incorrectly predict that a less reactive halogen can displace a more reactive halogen from its compound; instead, to correctly predict halogen displacement reactions, remember that a more reactive halogen will displace a less reactive halogen. For example, in the reaction between chlorine and potassium bromide, chlorine (more reactive) displaces bromine (less reactive). Therefore, the correct prediction is that chlorine will displace bromine, forming potassium chloride and bromine gas For exam answers, when predicting halogen displacement reactions, remember that a more reactive halogen will displace a less reactive halogen from its compound. Use the reactivity series of halogens to guide your predictions