| What is a Displacement reaction? Which Group uses this? | -This is when a More Reactive 'Pushes' [Displaces] a Less Reactive Element from the Compound.
-Group 7 is the most common one using it |
| What happens when a Chlorine Solution is added to Potassium Bromide?
-Equation for this Reaction, Balanced | -The Chlorine will Displace the Bromine, from the Salt [Kick out Bromine]
-The Chlorine is Reduced [Gains Electrons] to become Chloride Ions, making the salt now Potassium Chloride
-The Bromide Ions are Oxidised [Loses Electrons] making it become Bromine, which then Changes the Solution Orange
-Chlorine + Potassium Bromide ---> Bromine + Potassium Chloride
-[Cl²] + [2KBr] ---> [Br²] + [2KCl] |
| How can you use Displacements Reactions to show the Reactivity Trend of the Halogens? | -First measure a small amount of Halide Salt Solution, then add a few drops of a Halogen Solution into them
-If a Colour Change is Present, then a Displacement Reaction has taken place |
| What happens to Potassium Iodide when
-Chlorine Solution is Added
-Bromine Solution is Added
-Iodine Solution is Added | -When Chlorine Solution is added to Potassium Iodine, a Brown Solution is formed due to the Iodine being Displaced by the Chlorine, as its more Reactive
-When Bromine Solution is added to Potassium Iodine, a Brown Solution is formed due to the Iodine being Displaced by the Bromine, as its more Reactive
-When Iodine Solution is added to Potassium Iodine, Nothing happens as well its the same Element, so same Reactivity |
| What happens to Potassium Bromide, when
-Chlorine Solution is Added
-Iodine Solution is Added | -When Chlorine Solution is added, a Orange Solution is formed due to the Bromine being Displaced by the Chlorine, as its more Reactive
-When Iodine Solution is added, Nothing happens, as Bromine is more Reactive than Iodine, meaning it can't be Displaced. |
