Write ionic equations for halogen displacement reactions.

In the subtopic Halogen trends and displacement, this AQA A-Level Chemistry 7405 learning objective focuses on write ionic equations for 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. Halogen displacement reaction. means a chemical reaction where a more reactive halogen displaces a less reactive halogen from its compound Avoid the mistake of students often forget to balance the charges in ionic equations for halogen displacement reactions; instead, to write a correct ionic equation, ensure that the total charge on both sides is equal. For example, when writing the equation for the displacement of bromine by chlorine, start with Cl2 + 2Br- → 2Cl- + Br2. Check that the charges balance: 0 on the left and -2 on the right, which is incorrect. Adjust to ensure both sides have the same total charge For exam answers, when writing ionic equations for halogen displacement reactions, ensure to identify the halogens involved and their oxidation states. Write the full ionic equation first, then cancel out the spectator ions to arrive at the net ionic equation