... layer of chlorine moves to the cyclohexane layer. Chlorine is highly electronegative; they form ionic compounds with polar bonding. As you go down group seven electronegativity decreases. The equation for this reaction is: Cl2 (aq) +2K+I- (aq) 2K+Cl- (aq) + I2 This is a redox reaction, this is because Cl oxidises I- (oxidation state -1) to iodine (oxidation state 0). Chlorine, Cl2 (oxidation state 0 ) is reduced to Cl- (oxidation state -1). So the more reactive halogen (Cl) will oxidise the halide ions of a less reactive one (Br). The other equation for the reaction are: Cl2 (aq) +2K+Br- (aq) 2K+Cl- (aq) + Br2 When bromine solution is added to potassium chloride there is no change because chlorine is more reactive than bromine. What happens is that the solution becomes more dilute and lighter, see equation below. Br + KCl Br + KCl But when bromine is added to potassium iodide a ...

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